docs: add HattoriHenzo as a contributor for code (#1981)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

.all-contributorsrc

@@ -1703,6 +1703,107 @@
       "contributions": [
         "translation"
       ]
+    },
+    {
+      "login": "Fiordy",
+      "name": "Fiordy",
+      "avatar_url": "https://avatars.githubusercontent.com/u/53420573?v=4",
+      "profile": "https://github.com/Fiordy",
+      "contributions": [
+        "doc"
+      ]
+    },
+    {
+      "login": "harshalkh",
+      "name": "Harshal",
+      "avatar_url": "https://avatars.githubusercontent.com/u/37841724?v=4",
+      "profile": "https://github.com/harshalkh",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "vashisthabhinav",
+      "name": "Abhinav Vashisth",
+      "avatar_url": "https://avatars.githubusercontent.com/u/89785800?v=4",
+      "profile": "https://www.linkedin.com/in/abhinav-vashisth-06613b208/",
+      "contributions": [
+        "doc"
+      ]
+    },
+    {
+      "login": "Kevinyl3",
+      "name": "Kevin",
+      "avatar_url": "https://avatars.githubusercontent.com/u/47126749?v=4",
+      "profile": "http://no website",
+      "contributions": [
+        "review",
+        "code"
+      ]
+    },
+    {
+      "login": "Shrirang97",
+      "name": "Shrirang",
+      "avatar_url": "https://avatars.githubusercontent.com/u/28738668?v=4",
+      "profile": "https://github.com/Shrirang97",
+      "contributions": [
+        "review",
+        "code"
+      ]
+    },
+    {
+      "login": "interactwithankush",
+      "name": "interactwithankush",
+      "avatar_url": "https://avatars.githubusercontent.com/u/18613127?v=4",
+      "profile": "https://github.com/interactwithankush",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "yuhangbin",
+      "name": "CharlieYu",
+      "avatar_url": "https://avatars.githubusercontent.com/u/17566866?v=4",
+      "profile": "https://github.com/yuhangbin",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "Leisterbecker",
+      "name": "Leisterbecker",
+      "avatar_url": "https://avatars.githubusercontent.com/u/20650323?v=4",
+      "profile": "https://github.com/Leisterbecker",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "castleKing1997",
+      "name": "DragonDreamer",
+      "avatar_url": "https://avatars.githubusercontent.com/u/35420129?v=4",
+      "profile": "http://rosaecrucis.cn",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "ShivanshCharak",
+      "name": "ShivanshCharak",
+      "avatar_url": "https://avatars.githubusercontent.com/u/96943825?v=4",
+      "profile": "https://github.com/ShivanshCharak",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "HattoriHenzo",
+      "name": "HattoriHenzo",
+      "avatar_url": "https://avatars.githubusercontent.com/u/5141285?v=4",
+      "profile": "https://github.com/HattoriHenzo",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

.github/workflows/maven-ci.yml

@@ -24,6 +24,9 @@
 # This workflow will build a Java project with Maven
 # For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
 
+# We are using two jobs here for testing our code on the latest JDK 11 build as well as a more satble build version of 11.0.3
+# You can see the full discussion here https://github.com/iluwatar/java-design-patterns/pull/1868#issue-1029459688
+
 name: Java CI
 
 on:
@@ -33,12 +36,11 @@ on:
 
 jobs:
 
-  build:
+  # This Workflow Job will build this project and run Sonar analysis using JDK 11.0.3
+  build-and-analyze:
 
+    name: Build and Run Sonar analysis on JDK 11.0.3
     runs-on: ubuntu-20.04
-    strategy:
-      matrix:
-        java-version: [ 11.0.3, 11 ]
     steps:
 
     - name: Checkout Code
@@ -47,12 +49,14 @@ jobs:
         # Disabling shallow clone for improving relevancy of SonarQube reporting
         fetch-depth: 0
 
-    - name: Set up JDK ${{ matrix.java-version }}
+    - name: Set up JDK 11.0.3
       uses: actions/setup-java@v2
       with:
-        java-version: ${{ matrix.java-version }}
+        java-version: 11.0.3
         distribution: 'zulu'
+        cache: 'maven'
 
+    # Cache Sonar packages which as used to run anaylysis and collect metrics
     - name: Cache SonarCloud packages
       uses: actions/cache@v2
       with:
@@ -60,14 +64,6 @@ jobs:
         key: ${{ runner.os }}-sonar
         restore-keys: ${{ runner.os }}-sonar
 
-    - name: Cache Maven dependencies
-      uses: actions/cache@v2
-      with:
-        path: ~/.m2/repository
-        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-        restore-keys: |
-          ${{ runner.os }}-maven-
-
     # Some tests need screen access
     - name: Install xvfb
       run: sudo apt-get install -y xvfb
@@ -78,3 +74,28 @@ jobs:
         # These two env variables are needed for sonar analysis
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+
+  
+  # This Workflow Job is going to build the project on the latest stable JDK 11
+  build:
+
+    name: Build and Test on JDK 11
+    runs-on: ubuntu-20.04
+    steps:
+
+    - name: Checkout Code
+      uses: actions/checkout@v2
+
+    - name: Set up JDK 11 (Latest)
+      uses: actions/setup-java@v2
+      with:
+        java-version: 11
+        distribution: 'zulu'
+        cache: 'maven'
+
+    # Some tests need screen access
+    - name: Install xvfb
+      run: sudo apt-get install -y xvfb
+
+    - name: Build with Maven
+      run: xvfb-run ./mvnw clean verify

.github/workflows/maven-pr-builder.yml

@@ -34,11 +34,13 @@ on:
 jobs:
   build:
 
+    name: Build JDP
     runs-on: ubuntu-20.04
     strategy:
       matrix:
         java-version: [ 11.0.3, 11 ]
     steps:
+    
     - name: Checkout Code
       uses: actions/checkout@v2
     
@@ -47,14 +49,7 @@ jobs:
       with:
         java-version: ${{ matrix.java-version }}
         distribution: 'zulu'
-    
-    - name: Cache Maven Dependecies
-      uses: actions/cache@v2
-      with:
-        path: ~/.m2/repository
-        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-        restore-keys: |
-          ${{ runner.os }}-maven-
+        cache: 'maven'
     
     # Some tests need screen access
     - name: Install xvfb

.gitignore

@@ -12,6 +12,7 @@ tmp/
 local.properties
 .loadpath
 .recommenders
+.DS_Store
 
 #######  Java annotation processor (APT) ########
 .factorypath

.mvn/wrapper/maven-wrapper.properties

@@ -1,25 +1,18 @@
-#
-# The MIT License
-# Copyright © 2014-2021 Ilkka Seppälä
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-# THE SOFTWARE.
-#
-
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
-wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.4/apache-maven-3.8.4-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar

README.md

@@ -10,7 +10,7 @@
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=coverage)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
 [![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-187-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-198-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 <br/>
@@ -21,7 +21,7 @@ Read in different language : [**zh**](localization/zh/README.md), [**ko**](local
 
 # Introduction
 
-Design patterns are the best formalized practices a programmer can use to
+Design patterns are the best, formalized practices a programmer can use to
 solve common problems when designing an application or system.
 
 Design patterns can speed up the development process by providing tested, proven
@@ -34,11 +34,11 @@ are familiar with the patterns.
 # Getting started
 
 This site showcases Java Design Patterns. The solutions have been developed by
-experienced programmers and architects from the open source community. The
-patterns can be browsed by their high level descriptions or by looking at their
-source code. The source code examples are well commented and can be thought as
+experienced programmers and architects from the open-source community. The
+patterns can be browsed by their high-level descriptions or by looking at their
+source code. The source code examples are well commented and can be thought of as
 programming tutorials on how to implement a specific pattern. We use the most
-popular battle-proven open source Java technologies.
+popular battle-proven open-source Java technologies.
 
 Before you dive into the material, you should be familiar with various
 [Software Design Principles](https://java-design-patterns.com/principles/).
@@ -56,8 +56,8 @@ of the following approaches
  - Using tags such as `Performance`, `Gang of Four` or `Data access`.
  - Using pattern categories, `Creational`, `Behavioral`, and others.
 
-Hopefully you find the object oriented solutions presented on this site useful
-in your architectures and have as much fun learning them as we had developing them.
+Hopefully, you find the object-oriented solutions presented on this site useful
+in your architectures and have as much fun learning them as we had while developing them.
 
 # How to contribute
 
@@ -315,6 +315,21 @@ This project is licensed under the terms of the MIT license.
     <td align="center"><a href="https://github.com/ManviGoel26"><img src="https://avatars.githubusercontent.com/u/55682355?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Manvi Goel</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ManviGoel26" title="Documentation">📖</a></td>
     <td align="center"><a href="https://github.com/blueberry404"><img src="https://avatars.githubusercontent.com/u/39243539?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Anum Amin</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=blueberry404" title="Documentation">📖</a></td>
     <td align="center"><a href="https://uh-zz.github.io/blog/"><img src="https://avatars.githubusercontent.com/u/47747828?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Reo Uehara</b></sub></a><br /><a href="#translation-uh-zz" title="Translation">🌍</a></td>
+    <td align="center"><a href="https://github.com/Fiordy"><img src="https://avatars.githubusercontent.com/u/53420573?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Fiordy</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Fiordy" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://github.com/harshalkh"><img src="https://avatars.githubusercontent.com/u/37841724?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Harshal</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=harshalkh" title="Code">💻</a></td>
+  </tr>
+  <tr>
+    <td align="center"><a href="https://www.linkedin.com/in/abhinav-vashisth-06613b208/"><img src="https://avatars.githubusercontent.com/u/89785800?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Abhinav Vashisth</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=vashisthabhinav" title="Documentation">📖</a></td>
+    <td align="center"><a href="http://no website"><img src="https://avatars.githubusercontent.com/u/47126749?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kevin</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AKevinyl3" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=Kevinyl3" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/Shrirang97"><img src="https://avatars.githubusercontent.com/u/28738668?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Shrirang</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AShrirang97" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=Shrirang97" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/interactwithankush"><img src="https://avatars.githubusercontent.com/u/18613127?v=4?s=100" width="100px;" alt=""/><br /><sub><b>interactwithankush</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=interactwithankush" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/yuhangbin"><img src="https://avatars.githubusercontent.com/u/17566866?v=4?s=100" width="100px;" alt=""/><br /><sub><b>CharlieYu</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=yuhangbin" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/Leisterbecker"><img src="https://avatars.githubusercontent.com/u/20650323?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Leisterbecker</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Leisterbecker" title="Code">💻</a></td>
+    <td align="center"><a href="http://rosaecrucis.cn"><img src="https://avatars.githubusercontent.com/u/35420129?v=4?s=100" width="100px;" alt=""/><br /><sub><b>DragonDreamer</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=castleKing1997" title="Code">💻</a></td>
+  </tr>
+  <tr>
+    <td align="center"><a href="https://github.com/ShivanshCharak"><img src="https://avatars.githubusercontent.com/u/96943825?v=4?s=100" width="100px;" alt=""/><br /><sub><b>ShivanshCharak</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ShivanshCharak" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/HattoriHenzo"><img src="https://avatars.githubusercontent.com/u/5141285?v=4?s=100" width="100px;" alt=""/><br /><sub><b>HattoriHenzo</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=HattoriHenzo" title="Code">💻</a></td>
   </tr>
 </table>
 

abstract-document/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>abstract-document</artifactId>
   <dependencies>

abstract-factory/README.md

@@ -87,24 +87,36 @@ public interface KingdomFactory {
 }
 
 public class ElfKingdomFactory implements KingdomFactory {
+
+  @Override
   public Castle createCastle() {
     return new ElfCastle();
   }
+
+  @Override
   public King createKing() {
     return new ElfKing();
   }
+
+  @Override
   public Army createArmy() {
     return new ElfArmy();
   }
 }
 
 public class OrcKingdomFactory implements KingdomFactory {
+
+  @Override
   public Castle createCastle() {
     return new OrcCastle();
   }
+
+  @Override
   public King createKing() {
     return new OrcKing();
   }
+  
+  @Override
   public Army createArmy() {
     return new OrcArmy();
   }

abstract-factory/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>abstract-factory</artifactId>
   <dependencies>

active-object/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>active-object</artifactId>
   <dependencies>

acyclic-visitor/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>acyclic-visitor</artifactId>
   <properties>

acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/Hayes.java

@@ -29,7 +29,7 @@ import lombok.extern.slf4j.Slf4j;
  * Hayes class implements its accept method.
  */
 @Slf4j
-public class Hayes extends Modem {
+public class Hayes implements Modem {
 
   /**
    * Accepts all visitors but honors only HayesVisitor.

acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/Modem.java

@@ -24,8 +24,9 @@
 package com.iluwatar.acyclicvisitor;
 
 /**
- * Modem abstract class.
+ * //Modem abstract class.
+ * converted to an interface
  */
-public abstract class Modem {
-  public abstract void accept(ModemVisitor modemVisitor);
+public interface Modem {
+  void accept(ModemVisitor modemVisitor);
 }

acyclic-visitor/src/main/java/com/iluwatar/acyclicvisitor/Zoom.java

@@ -29,7 +29,7 @@ import lombok.extern.slf4j.Slf4j;
  * Zoom class implements its accept method.
  */
 @Slf4j
-public class Zoom extends Modem {
+public class Zoom implements Modem {
 
   /**
    * Accepts all visitors but honors only ZoomVisitor.

adapter/README.md

@@ -18,10 +18,10 @@ couldn't otherwise because of incompatible interfaces.
 
 ## Explanation
 
-Real world example
+Real-world example
 
-> Consider that you have some pictures in your memory card and you need to transfer them to your computer. In order to transfer them you need some kind of adapter that is compatible with your computer ports so that you can attach memory card to your computer. In this case card reader is an adapter.
-> Another example would be the famous power adapter; a three legged plug can't be connected to a two pronged outlet, it needs to use a power adapter that makes it compatible with the two pronged outlet.
+> Consider that you have some pictures on your memory card and you need to transfer them to your computer. To transfer them, you need some kind of adapter that is compatible with your computer ports so that you can attach a memory card to your computer. In this case card reader is an adapter.
+> Another example would be the famous power adapter; a three-legged plug can't be connected to a two-pronged outlet, it needs to use a power adapter that makes it compatible with the two-pronged outlets.
 > Yet another example would be a translator translating words spoken by one person to another
 
 In plain words
@@ -36,7 +36,7 @@ Wikipedia says
 
 Consider a captain that can only use rowing boats and cannot sail at all.
 
-First we have interfaces `RowingBoat` and `FishingBoat`
+First, we have interfaces `RowingBoat` and `FishingBoat`
 
 ```java
 public interface RowingBoat {
@@ -68,7 +68,7 @@ public class Captain {
 }
 ```
 
-Now let's say the pirates are coming and our captain needs to escape but there is only fishing boat available. We need to create an adapter that allows the captain to operate the fishing boat with his rowing boat skills.
+Now let's say the pirates are coming and our captain needs to escape but there is only a fishing boat available. We need to create an adapter that allows the captain to operate the fishing boat with his rowing boat skills.
 
 ```java
 @Slf4j
@@ -100,10 +100,10 @@ captain.row();
 ## Applicability
 Use the Adapter pattern when
 
-* you want to use an existing class, and its interface does not match the one you need
-* you want to create a reusable class that cooperates with unrelated or unforeseen classes, that is, classes that don't necessarily have compatible interfaces
-* you need to use several existing subclasses, but it's impractical to adapt their interface by subclassing every one. An object adapter can adapt the interface of its parent class.
-* most of the applications using third party libraries use adapters as a middle layer between the application and the 3rd party library to decouple the application from the library. If another library has to be used only an adapter for the new library is required without having to change the application code.
+* You want to use an existing class, and its interface does not match the one you need
+* You want to create a reusable class that cooperates with unrelated or unforeseen classes, that is, classes that don't necessarily have compatible interfaces
+* You need to use several existing subclasses, but it's impractical to adapt their interface by subclassing everyone. An object adapter can adapt the interface of its parent class.
+* Most of the applications using third-party libraries use adapters as a middle layer between the application and the 3rd party library to decouple the application from the library. If another library has to be used only an adapter for the new library is required without having to change the application code.
 
 ## Tutorials
 
@@ -114,17 +114,17 @@ Use the Adapter pattern when
 ## Consequences
 Class and object adapters have different trade-offs. A class adapter
 
-*	adapts Adaptee to Target by committing to a concrete Adaptee class. As a consequence, a class adapter won’t work when we want to adapt a class and all its subclasses.
-*	let’s Adapter override some of Adaptee’s behavior, since Adapter is a subclass of Adaptee.
-*	introduces only one object, and no additional pointer indirection is needed to get to the adaptee.
+*	Adapts Adaptee to Target by committing to a concrete Adaptee class. As a consequence, a class adapter won’t work when we want to adapt a class and all its subclasses.
+*	Let’s Adapter override some of Adaptee’s behavior since Adapter is a subclass of Adaptee.
+*	Introduces only one object, and no additional pointer indirection is needed to get to the adaptee.
 
 An object adapter	
 
-*	let’s a single Adapter work with many Adaptees—that is, the Adaptee itself and all of its subclasses (if any). The Adapter can also add functionality to all Adaptees at once.
-*	makes it harder to override Adaptee behavior. It will require subclassing Adaptee and making Adapter refer to the subclass rather than the Adaptee itself.
+*	Lets a single Adapter work with many Adaptees—that is, the Adaptee itself and all of its subclasses (if any). The Adapter can also add functionality to all Adaptees at once.
+*	Makes it harder to override Adaptee behavior. It will require subclassing Adaptee and making the Adapter refer to the subclass rather than the Adaptee itself.
 
 
-## Known uses
+## Real-world examples
 
 * [java.util.Arrays#asList()](http://docs.oracle.com/javase/8/docs/api/java/util/Arrays.html#asList%28T...%29)
 * [java.util.Collections#list()](https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#list-java.util.Enumeration-)

adapter/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>adapter</artifactId>
   <dependencies>

adapter/src/test/java/com/iluwatar/adapter/AdapterPatternTest.java

@@ -33,7 +33,7 @@ import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
 
 /**
- * Test class
+ * Tests for the adapter pattern.
  */
 class AdapterPatternTest {
 

adapter/src/test/java/com/iluwatar/adapter/AppTest.java

@@ -33,9 +33,7 @@ import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 class AppTest {
 
   /**
-   * Issue: Add at least one assertion to this test case.
-   *
-   * Solution: Inserted assertion to check whether the execution of the main method in {@link App}
+   * Check whether the execution of the main method in {@link App}
    * throws an exception.
    */
 

aggregator-microservices/aggregator-service/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>aggregator-microservices</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>aggregator-service</artifactId>

aggregator-microservices/information-microservice/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>aggregator-microservices</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>information-microservice</artifactId>

aggregator-microservices/inventory-microservice/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>aggregator-microservices</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>inventory-microservice</artifactId>

aggregator-microservices/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>aggregator-microservices</artifactId>

ambassador/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>ambassador</artifactId>

api-gateway/api-gateway-service/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>api-gateway</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>api-gateway-service</artifactId>

api-gateway/image-microservice/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>api-gateway</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>image-microservice</artifactId>

api-gateway/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>api-gateway</artifactId>

api-gateway/price-microservice/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>api-gateway</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>price-microservice</artifactId>

arrange-act-assert/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>arrange-act-assert</artifactId>

async-method-invocation/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>async-method-invocation</artifactId>
   <dependencies>

balking/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>balking</artifactId>

bridge/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>bridge</artifactId>
   <dependencies>

builder/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>builder</artifactId>
   <dependencies>

business-delegate/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>business-delegate</artifactId>
   <dependencies>

bytecode/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>bytecode</artifactId>

caching/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>caching</artifactId>
   <dependencies>

callback/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>callback</artifactId>
   <dependencies>

chain-of-responsibility/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>chain-of-responsibility</artifactId>
   <dependencies>

circuit-breaker/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>circuit-breaker</artifactId>
   <dependencies>

cloud-claim-check-pattern/.gitignore

@@ -0,0 +1,38 @@
+# Build output
+target/
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# IDE
+.idea/
+*.iml
+.settings/
+.project
+.classpath
+
+# macOS
+.DS_Store
+
+# Azure Functions
+local.settings.json
+bin/
+obj/

cloud-claim-check-pattern/README.md

@@ -0,0 +1,83 @@
+---
+layout: pattern
+title: Claim Check Pattern
+folder: cloud-claim-check-pattern
+permalink: /patterns/cloud-claim-check-pattern/
+categories: Cloud
+language: en
+tags:
+  - Cloud distributed
+  - Microservices
+---
+
+## Name
+
+[Claim Check Pattern](https://docs.microsoft.com/en-us/azure/architecture/patterns/claim-check)
+
+## Also known as
+
+[Reference-Based Messaging](https://www.enterpriseintegrationpatterns.com/patterns/messaging/StoreInLibrary.html)
+
+## Intent
+
+- Reduce the load of data transfer through the Internet. Instead of sending actual data directly, just send the message reference.
+- Improve data security. As only message reference is shared, no data is exposed to the Internet.
+
+## Explanation
+
+Real-World Example
+
+> Suppose if you want to build a photo processing system. A photo processing system takes an image as input, processes it, and outputs a different set of images. Consider system has one persistent storage, one input component, ten processing components, messaging platform. Once a photo is given to the input component, it stores that image on persistent storage. It then creates ten different messages/events with the same image location and publishes them to the messaging platform. The messaging platform triggers ten different processing components. The ten processing components extract information about image location from the received event and then read an image from persistent storage. They generate ten different images from the original image and drop these images again to persistent storage.
+
+In Plain words
+
+> Split a large message into a claim check and a payload. Send the claim check to the messaging platform and store the payload to an external service. This pattern allows large messages to be processed while protecting the message bus and the client from being overwhelmed or slowed down. This pattern also helps to reduce costs, as storage is usually cheaper than resource units used by the messaging platform.([ref](https://docs.microsoft.com/en-us/azure/architecture/patterns/claim-check))
+
+## Architecture Diagram
+
+![alt text](./etc/Claim-Check-Pattern.png "Claim Check Pattern")
+
+## Applicability
+
+Use the Claim Check Pattern when
+
+- Huge processing data causes a lot of bandwidth consumption to transfer data through the Internet.
+- To secure your data transfer by storing in common persistent storage.
+- Using a cloud platform - Azure Functions or AWS Lambda, Azure EventGrid or AWS Event Bridge, Azure Blob Storage or AWS S3 Bucket.
+- Each service must be independent and idempotent. Output data is dropped to persistent storage by the service.
+- Publish-subscribe messaging pattern needs to be used.
+
+## Consequences
+
+- This pattern is stateless. Any compute API will not store any data.
+- You must have persistent storage and a reliable messaging platform.
+
+## Tutorials
+
+### Workflow
+
+Suppose a telecom company wants to build call cost calculator system which generate the call cost daily. At the end of each day, details of the calls made by the consumers are stored somewhere. The call calculator system will read this data and generate call cost data for each user. Consumers will be billed using this generated data in case of postpaid service.
+
+Producer class( `UsageDetailPublisherFunction` Azure Function) will generate call usage details (here we are generating call data in producer class itself. In real world scenario, it will read from storage). `UsageDetailPublisherFunction` creates a message. Message consists of message header and message body. Message header is basically an event grid event or claim or message reference. Message body contains actual data. `UsageDetailPublisherFunction` sends a message header to Event Grid topic `usage-detail` and drops an entire message to the blob storage. Event Grid then sent this message header to the `UsageCostProcessorFunction` Azure function. It will read the entire message from blob storage with the help of the header, will calculate call cost and drop the result to the blob storage.
+
+### Class Diagrams
+
+![alt text](./etc/class-diagram.png "Claim-Check-Class-Diagram")
+
+### Setup
+
+- Any operating system can be used macOS, Windows, Linux as everything is deployed on Azure.
+- Install Java JDK 11 and set up Java environmental variables.
+- Install Git.
+- Install Visual Studio Code.
+- Install [ Azure Functions extension](https://marketplace.visualstudio.com/items?itemName=ms-azuretools.vscode-azurefunctions) to be able to deploy using Visual studio.
+
+### Storage Data
+
+The data is stored in the Azure blob storage in the container `callusageapp`. For every trigger, one GUID is created. Under the `GUID folder`, 2 files will be created `input.json` and `output.json`.
+`Input.json` is dropped `producer` azure function which contains call usage details.` Output.json` contains call cost details which are dropped by the `consumer` azure function.
+
+## Credits
+
+- [Messaging Pattern - Claim Check](https://www.enterpriseintegrationpatterns.com/patterns/messaging/StoreInLibrary.html)
+- [Azure Architecture Pattern - Claim Check Pattern](https://docs.microsoft.com/en-us/azure/architecture/patterns/claim-check)

cloud-claim-check-pattern/call-usage-app/.gitignore

@@ -0,0 +1,38 @@
+# Build output
+target/
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# IDE
+.idea/
+*.iml
+.settings/
+.project
+.classpath
+
+# macOS
+.DS_Store
+
+# Azure Functions
+local.settings.json
+bin/
+obj/

cloud-claim-check-pattern/call-usage-app/etc/call-usage-app.urm.puml

@@ -0,0 +1,117 @@
+@startuml
+package com.iluwatar.claimcheckpattern.producer.calldetails.functions {
+  class UsageDetailPublisherFunction {
+    - eventHandlerUtility : EventHandlerUtility<MessageHeader>
+    - messageHandlerUtility : MessageHandlerUtility<UsageDetail>
+    + UsageDetailPublisherFunction()
+    + UsageDetailPublisherFunction(messageHandlerUtility : MessageHandlerUtility<UsageDetail>, eventHandlerUtility : EventHandlerUtility<MessageHeader>)
+    + run(request : HttpRequestMessage<Optional<String>>, context : ExecutionContext) : HttpResponseMessage
+  }
+}
+package com.iluwatar.claimcheckpattern.domain {
+  class Message<T> {
+    - messageBody : MessageBody<T>
+    - messageHeader : MessageHeader
+    + Message<T>()
+    + getMessageBody() : MessageBody<T>
+    + getMessageHeader() : MessageHeader
+    + setMessageBody(messageBody : MessageBody<T>)
+    + setMessageHeader(messageHeader : MessageHeader)
+  }
+  class MessageBody<T> {
+    - data : List<T>
+    + MessageBody<T>()
+    + getData() : List<T>
+    + setData(data : List<T>)
+  }
+  class MessageHeader {
+    - data : Object
+    - dataVersion : String
+    - eventTime : String
+    - eventType : String
+    - id : String
+    - subject : String
+    - topic : String
+    + MessageHeader()
+    + getData() : Object
+    + getDataVersion() : String
+    + getEventTime() : String
+    + getEventType() : String
+    + getId() : String
+    + getSubject() : String
+    + getTopic() : String
+    + setData(data : Object)
+    + setDataVersion(dataVersion : String)
+    + setEventTime(eventTime : String)
+    + setEventType(eventType : String)
+    + setId(id : String)
+    + setSubject(subject : String)
+    + setTopic(topic : String)
+  }
+  class MessageReference {
+    - dataFileName : String
+    - dataLocation : String
+    + MessageReference()
+    + MessageReference(dataLocation : String, dataFileName : String)
+    + getDataFileName() : String
+    + getDataLocation() : String
+    + setDataFileName(dataFileName : String)
+    + setDataLocation(dataLocation : String)
+  }
+  class UsageCostDetail {
+    - callCost : double
+    - dataCost : double
+    - userId : String
+    + UsageCostDetail()
+    + getCallCost() : double
+    + getDataCost() : double
+    + getUserId() : String
+    + setCallCost(callCost : double)
+    + setDataCost(dataCost : double)
+    + setUserId(userId : String)
+  }
+  class UsageDetail {
+    - data : int
+    - duration : int
+    - userId : String
+    + UsageDetail()
+    + getData() : int
+    + getDuration() : int
+    + getUserId() : String
+    + setData(data : int)
+    + setDuration(duration : int)
+    + setUserId(userId : String)
+  }
+}
+package com.iluwatar.claimcheckpattern.utility {
+  class EventHandlerUtility<T> {
+    - customEventClient : EventGridPublisherClient<BinaryData>
+    + EventHandlerUtility<T>()
+    + EventHandlerUtility<T>(customEventClient : EventGridPublisherClient<BinaryData>)
+    + publishEvent(customEvent : T, logger : Logger)
+  }
+  class MessageHandlerUtility<T> {
+    - blobServiceClient : BlobServiceClient
+    + MessageHandlerUtility<T>()
+    + MessageHandlerUtility<T>(blobServiceClient : BlobServiceClient)
+    + dropToPersistantStorage(message : Message<T>, logger : Logger)
+    + readFromPersistantStorage(messageReference : MessageReference, logger : Logger) : Message<T>
+  }
+}
+package com.iluwatar.claimcheckpattern.consumer.callcostprocessor.functions {
+  class UsageCostProcessorFunction {
+    - messageHandlerUtilityForUsageCostDetail : MessageHandlerUtility<UsageCostDetail>
+    - messageHandlerUtilityForUsageDetail : MessageHandlerUtility<UsageDetail>
+    + UsageCostProcessorFunction()
+    + UsageCostProcessorFunction(messageHandlerUtilityForUsageDetail : MessageHandlerUtility<UsageDetail>, messageHandlerUtilityForUsageCostDetail : MessageHandlerUtility<UsageCostDetail>)
+    - calculateUsageCostDetails(usageDetailsList : List<UsageDetail>) : List<UsageCostDetail>
+    + run(request : HttpRequestMessage<Optional<String>>, context : ExecutionContext) : HttpResponseMessage
+  }
+}
+UsageCostProcessorFunction -->  "-messageHandlerUtilityForUsageDetail" MessageHandlerUtility
+Message -->  "-messageBody" MessageBody
+UsageDetailPublisherFunction -->  "-eventHandlerUtility" EventHandlerUtility
+Builder ..+ HttpResponseMessage
+UsageDetailPublisherFunction -->  "-messageHandlerUtility" MessageHandlerUtility
+Message -->  "-messageHeader" MessageHeader
+@enduml

cloud-claim-check-pattern/call-usage-app/host.json

@@ -0,0 +1,7 @@
+{
+  "version": "2.0",
+  "extensionBundle": {
+    "id": "Microsoft.Azure.Functions.ExtensionBundle",
+    "version": "[1.*, 2.0.0)"
+  } 
+}

cloud-claim-check-pattern/call-usage-app/pom.xml

@@ -0,0 +1,150 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!--
+
+    The MIT License
+    Copyright © 2014-2021 Ilkka Seppälä
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+
+    <parent>
+	    <groupId>com.iluwatar</groupId>
+	    <artifactId>claim-check-pattern</artifactId>
+	    <version>1.25.0-SNAPSHOT</version>		
+	 </parent>
+    
+    <artifactId>call-usage-app</artifactId>
+    <name>call-usage-app</name>
+    <packaging>jar</packaging>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <azure.functions.maven.plugin.version>1.14.0</azure.functions.maven.plugin.version>
+        <azure.functions.java.library.version>1.4.2</azure.functions.java.library.version>
+        <functionAppName>CallUsageApp</functionAppName>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>com.azure</groupId>
+                <artifactId>azure-sdk-bom</artifactId>
+                <version>1.0.4</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.microsoft.azure.functions</groupId>
+            <artifactId>azure-functions-java-library</artifactId>
+            <version>${azure.functions.java.library.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.azure</groupId>
+            <artifactId>azure-messaging-eventgrid</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.azure</groupId>
+            <artifactId>azure-storage-blob</artifactId>
+            <version>12.13.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <!-- Test -->
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>com.microsoft.azure</groupId>
+                <artifactId>azure-functions-maven-plugin</artifactId>
+                <version>${azure.functions.maven.plugin.version}</version>
+                <configuration>
+                    <!-- function app name -->
+                    <appName>${functionAppName}</appName>
+                    <!-- function app resource group -->
+                    <resourceGroup>java-functions-group</resourceGroup>
+                    <!-- function app service plan name -->
+                    <appServicePlanName>java-functions-app-service-plan</appServicePlanName>
+                    <!-- function app region-->
+                    <!-- refers https://github.com/microsoft/azure-maven-plugins/wiki/Azure-Functions:-Configuration-Details#supported-regions for all valid values -->
+                    <region>westus</region>
+                    <!-- function pricingTier, default to be consumption if not specified -->
+                    <!-- refers https://github.com/microsoft/azure-maven-plugins/wiki/Azure-Functions:-Configuration-Details#supported-pricing-tiers for all valid values -->
+                    <!-- <pricingTier></pricingTier> -->
+                    <!-- Whether to disable application insights, default is false -->
+                    <!-- refers https://github.com/microsoft/azure-maven-plugins/wiki/Azure-Functions:-Configuration-Details for all valid configurations for application insights-->
+                    <!-- <disableAppInsights></disableAppInsights> -->
+                    <runtime>
+                        <!-- runtime os, could be windows, linux or docker-->
+                        <os>windows</os>
+                        <javaVersion>11</javaVersion>
+                    </runtime>
+                    <appSettings>
+                        <property>
+                            <name>FUNCTIONS_EXTENSION_VERSION</name>
+                            <value>~3</value>
+                        </property>
+                    </appSettings>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>package-functions</id>
+                        <goals>
+                            <goal>package</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <!--Remove obj folder generated by .NET SDK in maven clean-->
+            <plugin>
+                <artifactId>maven-clean-plugin</artifactId>
+                <version>3.1.0</version>
+                <configuration>
+                    <filesets>
+                        <fileset>
+                            <directory>obj</directory>
+                        </fileset>
+                    </filesets>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/consumer/callcostprocessor/functions/UsageCostProcessorFunction.java

@@ -0,0 +1,168 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.consumer.callcostprocessor.functions;
+
+import com.azure.core.util.BinaryData;
+import com.azure.core.util.serializer.TypeReference;
+import com.azure.messaging.eventgrid.EventGridEvent;
+import com.azure.messaging.eventgrid.systemevents.SubscriptionValidationEventData;
+import com.azure.messaging.eventgrid.systemevents.SubscriptionValidationResponse;
+import com.iluwatar.claimcheckpattern.domain.Message;
+import com.iluwatar.claimcheckpattern.domain.MessageBody;
+import com.iluwatar.claimcheckpattern.domain.MessageHeader;
+import com.iluwatar.claimcheckpattern.domain.MessageReference;
+import com.iluwatar.claimcheckpattern.domain.UsageCostDetail;
+import com.iluwatar.claimcheckpattern.domain.UsageDetail;
+import com.iluwatar.claimcheckpattern.utility.MessageHandlerUtility;
+import com.microsoft.azure.functions.ExecutionContext;
+import com.microsoft.azure.functions.HttpMethod;
+import com.microsoft.azure.functions.HttpRequestMessage;
+import com.microsoft.azure.functions.HttpResponseMessage;
+import com.microsoft.azure.functions.HttpStatus;
+import com.microsoft.azure.functions.annotation.AuthorizationLevel;
+import com.microsoft.azure.functions.annotation.FunctionName;
+import com.microsoft.azure.functions.annotation.HttpTrigger;
+import java.time.OffsetDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Azure Functions with HTTP Trigger.
+ * This is Consumer class.
+ */
+public class UsageCostProcessorFunction {
+
+  private MessageHandlerUtility<UsageDetail> messageHandlerUtilityForUsageDetail;
+  private MessageHandlerUtility<UsageCostDetail> messageHandlerUtilityForUsageCostDetail;
+
+  public UsageCostProcessorFunction() {
+    this.messageHandlerUtilityForUsageDetail = new MessageHandlerUtility<>();
+    this.messageHandlerUtilityForUsageCostDetail = new MessageHandlerUtility<>();
+  }
+
+  public UsageCostProcessorFunction(
+      MessageHandlerUtility<UsageDetail> messageHandlerUtilityForUsageDetail,
+      MessageHandlerUtility<UsageCostDetail> messageHandlerUtilityForUsageCostDetail) {
+    this.messageHandlerUtilityForUsageDetail = messageHandlerUtilityForUsageDetail;
+    this.messageHandlerUtilityForUsageCostDetail = messageHandlerUtilityForUsageCostDetail;
+  }
+
+  /**
+   * Azure function which gets triggered when event grid event send event to it.
+   * After receiving event, it read input file from blob storage, calculate call cost details.
+   * It creates new message with cost details and drop message to blob storage.
+   * @param request represents HttpRequestMessage
+   * @param context represents ExecutionContext
+   * @return HttpResponseMessage
+   */
+  @FunctionName("UsageCostProcessorFunction")
+  public HttpResponseMessage run(@HttpTrigger(name = "req", methods = { HttpMethod.GET,
+      HttpMethod.POST }, authLevel = AuthorizationLevel.ANONYMOUS)
+                                       HttpRequestMessage<Optional<String>> request,
+                                 final ExecutionContext context) {
+    try {
+      var eventGridEvents = EventGridEvent.fromString(request.getBody().get());
+      for (var eventGridEvent : eventGridEvents) {
+        // Handle system events
+        if (eventGridEvent.getEventType()
+            .equals("Microsoft.EventGrid.SubscriptionValidationEvent")) {
+          SubscriptionValidationEventData subscriptionValidationEventData = eventGridEvent.getData()
+              .toObject(SubscriptionValidationEventData.class);
+          // Handle the subscription validation event
+          var responseData = new SubscriptionValidationResponse();
+          responseData.setValidationResponse(subscriptionValidationEventData.getValidationCode());
+          return request.createResponseBuilder(HttpStatus.OK).body(responseData).build();
+
+        } else if (eventGridEvent.getEventType().equals("UsageDetail")) {
+          // Get message header and reference
+          var messageReference = eventGridEvent.getData()
+              .toObject(MessageReference.class);
+
+          // Read message from persistent storage
+          var message = this.messageHandlerUtilityForUsageDetail
+              .readFromPersistantStorage(messageReference, context.getLogger());
+
+          // Get Data and generate cost details
+          List<UsageDetail> usageDetailsList = BinaryData.fromObject(
+              message.getMessageBody().getData())
+              .toObject(new TypeReference<>() {
+              });
+          var usageCostDetailsList = calculateUsageCostDetails(usageDetailsList);
+
+          // Create message body
+          var newMessageBody = new MessageBody<UsageCostDetail>();
+          newMessageBody.setData(usageCostDetailsList);
+
+          // Create message header
+          var newMessageReference = new MessageReference("callusageapp",
+              eventGridEvent.getId() + "/output.json");
+          var newMessageHeader = new MessageHeader();
+          newMessageHeader.setId(eventGridEvent.getId());
+          newMessageHeader.setSubject("UsageCostProcessor");
+          newMessageHeader.setTopic("");
+          newMessageHeader.setEventType("UsageCostDetail");
+          newMessageHeader.setEventTime(OffsetDateTime.now().toString());
+          newMessageHeader.setData(newMessageReference);
+          newMessageHeader.setDataVersion("v1.0");
+
+          // Create entire message
+          var newMessage = new Message<UsageCostDetail>();
+          newMessage.setMessageHeader(newMessageHeader);
+          newMessage.setMessageBody(newMessageBody);
+
+          // Drop data to persistent storage
+          this.messageHandlerUtilityForUsageCostDetail.dropToPersistantStorage(newMessage,
+              context.getLogger());
+
+          context.getLogger().info("Message is dropped successfully");
+          return request.createResponseBuilder(HttpStatus.OK)
+              .body("Message is dropped successfully").build();
+        }
+      }
+    } catch (Exception e) {
+      context.getLogger().warning(e.getMessage());
+    }
+
+    return request.createResponseBuilder(HttpStatus.INTERNAL_SERVER_ERROR).body(null).build();
+  }
+
+  private List<UsageCostDetail> calculateUsageCostDetails(List<UsageDetail> usageDetailsList) {
+    if (usageDetailsList == null) {
+      return null;
+    }
+    var usageCostDetailsList = new ArrayList<UsageCostDetail>();
+
+    usageDetailsList.forEach(usageDetail -> {
+      var usageCostDetail = new UsageCostDetail();
+      usageCostDetail.setUserId(usageDetail.getUserId());
+      usageCostDetail.setCallCost(usageDetail.getDuration() * 0.30); // 0.30₹ per minute
+      usageCostDetail.setDataCost(usageDetail.getData() * 0.20); // 0.20₹ per MB
+
+      usageCostDetailsList.add(usageCostDetail);
+    });
+
+    return usageCostDetailsList;
+  }
+}

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/domain/Message.java

@@ -0,0 +1,43 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * It is the message which gets dropped or read by Producer or Consumer Azure functions.
+ * It is stored in the json format.
+ * @param <T> represents UsageDetail or UsageCostDetail
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class Message<T> {
+  private MessageHeader messageHeader;
+
+  private MessageBody<T> messageBody;
+
+}

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/domain/MessageBody.java

@@ -0,0 +1,43 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.domain;
+
+import java.util.List;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * It is message body of the message.
+ * It stores actual data in our case UsageCostDetail or UsageDetail.
+ * @param <T> represents UsageDetail or UsageCostDetail
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class MessageBody<T> {
+
+  private List<T> data;
+
+}

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/domain/MessageHeader.java

@@ -0,0 +1,47 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * This is message header or event which is sent to Event Grid.
+ * Its structure is same as Azure Event Grid Event Class.
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class MessageHeader {
+
+  private String id;
+  private String subject;
+  private String topic;
+  private String eventType;
+  private String eventTime;
+  private Object data;
+  private String dataVersion;
+
+}

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/domain/MessageReference.java

@@ -0,0 +1,45 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * This is claim/message reference class.
+ * It contains the information about data where it is stored in persistent storage
+ * and file name.
+ * dataLocation is blob storage container name.
+ * dataFileName is file name in above container.
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class MessageReference {
+
+  private String dataLocation;
+  private String dataFileName;
+
+}

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/domain/UsageCostDetail.java

@@ -0,0 +1,43 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * This is call cost details class.
+ * It stores userId of the caller, call duration cost and data cost.
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class UsageCostDetail {
+
+  private String userId;
+  private double callCost;
+  private double dataCost;
+
+}

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/domain/UsageDetail.java

@@ -0,0 +1,44 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * This is call usage detail calls.
+ * It stores userId of the caller, call duration and data used.
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class UsageDetail {
+
+  private String userId;
+
+  private int duration;
+
+  private int data;
+}

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/producer/calldetails/functions/UsageDetailPublisherFunction.java

@@ -0,0 +1,146 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.producer.calldetails.functions;
+
+import com.azure.messaging.eventgrid.EventGridEvent;
+import com.azure.messaging.eventgrid.systemevents.SubscriptionValidationEventData;
+import com.azure.messaging.eventgrid.systemevents.SubscriptionValidationResponse;
+import com.iluwatar.claimcheckpattern.domain.Message;
+import com.iluwatar.claimcheckpattern.domain.MessageBody;
+import com.iluwatar.claimcheckpattern.domain.MessageHeader;
+import com.iluwatar.claimcheckpattern.domain.MessageReference;
+import com.iluwatar.claimcheckpattern.domain.UsageDetail;
+import com.iluwatar.claimcheckpattern.utility.EventHandlerUtility;
+import com.iluwatar.claimcheckpattern.utility.MessageHandlerUtility;
+import com.microsoft.azure.functions.ExecutionContext;
+import com.microsoft.azure.functions.HttpMethod;
+import com.microsoft.azure.functions.HttpRequestMessage;
+import com.microsoft.azure.functions.HttpResponseMessage;
+import com.microsoft.azure.functions.HttpStatus;
+import com.microsoft.azure.functions.annotation.AuthorizationLevel;
+import com.microsoft.azure.functions.annotation.FunctionName;
+import com.microsoft.azure.functions.annotation.HttpTrigger;
+import java.time.OffsetDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.Random;
+import java.util.UUID;
+
+/**
+ * Azure Functions with HTTP Trigger.
+ * This is Producer class.
+ */
+public class UsageDetailPublisherFunction {
+
+  private MessageHandlerUtility<UsageDetail> messageHandlerUtility;
+  private EventHandlerUtility<MessageHeader> eventHandlerUtility;
+
+  public UsageDetailPublisherFunction() {
+    this.messageHandlerUtility = new MessageHandlerUtility<>();
+    this.eventHandlerUtility = new EventHandlerUtility<>();
+  }
+
+  public UsageDetailPublisherFunction(MessageHandlerUtility<UsageDetail> messageHandlerUtility,
+      EventHandlerUtility<MessageHeader> eventHandlerUtility) {
+    this.messageHandlerUtility = messageHandlerUtility;
+    this.eventHandlerUtility = eventHandlerUtility;
+  }
+
+  /**
+   * Azure function which create message, drop it in persistent storage
+   * and publish the event to Event Grid topic.
+   * @param request represents HttpRequestMessage
+   * @param context represents ExecutionContext
+   * @return HttpResponseMessage
+   */
+  @FunctionName("UsageDetailPublisherFunction")
+  public HttpResponseMessage run(@HttpTrigger(name = "req", methods = {
+      HttpMethod.POST }, authLevel = AuthorizationLevel.ANONYMOUS)
+      HttpRequestMessage<Optional<String>> request,
+      final ExecutionContext context) {
+    try {
+
+      var eventGridEvents = EventGridEvent.fromString(request.getBody().get());
+
+      for (EventGridEvent eventGridEvent : eventGridEvents) {
+        // Handle system events
+        if (eventGridEvent.getEventType()
+            .equals("Microsoft.EventGrid.SubscriptionValidationEvent")) {
+          SubscriptionValidationEventData subscriptionValidationEventData = eventGridEvent.getData()
+              .toObject(SubscriptionValidationEventData.class);
+          // Handle the subscription validation event
+          var responseData = new SubscriptionValidationResponse();
+          responseData.setValidationResponse(subscriptionValidationEventData.getValidationCode());
+          return request.createResponseBuilder(HttpStatus.OK).body(responseData).build();
+
+        } else if (eventGridEvent.getEventType().equals("UsageDetail")) {
+          // Create message body
+          var messageBody = new MessageBody<UsageDetail>();
+          var usageDetailsList = new ArrayList<UsageDetail>();
+          var random = new Random();
+          for (int i = 0; i < 51; i++) {
+            var usageDetail = new UsageDetail();
+            usageDetail.setUserId("userId" + i);
+            usageDetail.setData(random.nextInt(500));
+            usageDetail.setDuration(random.nextInt(500));
+
+            usageDetailsList.add(usageDetail);
+          }
+          messageBody.setData(usageDetailsList);
+
+          // Create message header
+          var messageHeader = new MessageHeader();
+          messageHeader.setId(UUID.randomUUID().toString());
+          messageHeader.setSubject("UsageDetailPublisher");
+          messageHeader.setTopic("usagecostprocessorfunction-topic");
+          messageHeader.setEventType("UsageDetail");
+          messageHeader.setEventTime(OffsetDateTime.now().toString());
+          var messageReference = new MessageReference("callusageapp",
+              messageHeader.getId() + "/input.json");
+          messageHeader.setData(messageReference);
+          messageHeader.setDataVersion("v1.0");
+
+          // Create entire message
+          var message = new Message<UsageDetail>();
+          message.setMessageHeader(messageHeader);
+          message.setMessageBody(messageBody);
+
+          // Drop data to persistent storage
+          this.messageHandlerUtility.dropToPersistantStorage(message, context.getLogger());
+
+          // Publish event to event grid topic
+          eventHandlerUtility.publishEvent(messageHeader, context.getLogger());
+
+          context.getLogger().info("Message is dropped and event is published successfully");
+          return request.createResponseBuilder(HttpStatus.OK).body(message).build();
+        }
+      }
+    } catch (Exception e) {
+      context.getLogger().warning(e.getMessage());
+    }
+
+    return request.createResponseBuilder(HttpStatus.OK).body(null).build();
+  }
+}

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/utility/EventHandlerUtility.java

@@ -0,0 +1,66 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.utility;
+
+import com.azure.core.credential.AzureKeyCredential;
+import com.azure.core.util.BinaryData;
+import com.azure.messaging.eventgrid.EventGridPublisherClient;
+import com.azure.messaging.eventgrid.EventGridPublisherClientBuilder;
+import java.util.logging.Logger;
+
+/**
+ * This class is event publisher utility which published message header to Event Grid topic.
+ * @param <T> represents UsageDetail or UsageCostDetail
+ */
+public class EventHandlerUtility<T> {
+
+  private EventGridPublisherClient<BinaryData> customEventClient;
+
+  /** Default constructor.
+   */
+  public EventHandlerUtility() {
+    this.customEventClient = new EventGridPublisherClientBuilder()
+            .endpoint(System.getenv("EventGridURL"))
+        .credential(new AzureKeyCredential(System.getenv("EventGridKey")))
+            .buildCustomEventPublisherClient();
+  }
+
+  /**
+  Parameterized constructor.
+   */
+  public EventHandlerUtility(EventGridPublisherClient<BinaryData> customEventClient) {
+    this.customEventClient = customEventClient;
+  }
+
+  /**
+  Method for publishing event to Event Grid Topic.
+   */
+  public void publishEvent(T customEvent, Logger logger) {
+    try {
+      customEventClient.sendEvent(BinaryData.fromObject(customEvent));
+    } catch (Exception e) {
+      logger.info(e.getMessage());
+    }
+  }
+}

cloud-claim-check-pattern/call-usage-app/src/main/java/com/iluwatar/claimcheckpattern/utility/MessageHandlerUtility.java

@@ -0,0 +1,127 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.utility;
+
+import com.azure.core.util.BinaryData;
+import com.azure.core.util.serializer.TypeReference;
+import com.azure.storage.blob.BlobClient;
+import com.azure.storage.blob.BlobContainerClient;
+import com.azure.storage.blob.BlobServiceClient;
+import com.azure.storage.blob.BlobServiceClientBuilder;
+import com.iluwatar.claimcheckpattern.domain.Message;
+import com.iluwatar.claimcheckpattern.domain.MessageReference;
+import java.util.logging.Logger;
+
+/**
+ * This class read and drop message from Azure blob storage.
+ * @param <T> represents UsageDetail or UsageCostDetail
+ */
+public class MessageHandlerUtility<T> {
+
+  private BlobServiceClient blobServiceClient;
+
+  /**
+   * Parameterized constructor.
+   * @param blobServiceClient represents BlobServiceClient
+   */
+  public MessageHandlerUtility(BlobServiceClient blobServiceClient) {
+    this.blobServiceClient = blobServiceClient;
+  }
+
+  /**
+   * Default constructor.
+   */
+  public MessageHandlerUtility() {
+    // Create a BlobServiceClient object which will be used to create a container
+    // client
+    this.blobServiceClient = new BlobServiceClientBuilder()
+        .connectionString(System.getenv("BlobStorageConnectionString")).buildClient();
+
+  }
+
+  /**
+   * Read message from blob storage.
+   * @param messageReference represents MessageReference
+   * @param logger represents Logger
+   * @return Message
+   */
+  public Message<T> readFromPersistantStorage(MessageReference messageReference, Logger logger) {
+    Message<T> message = null;
+    try {
+
+      // Get container name from message reference
+      String containerName = messageReference.getDataLocation();
+
+      // Get blob name from message reference
+      String blobName = messageReference.getDataFileName();
+
+      // Get container client
+      BlobContainerClient containerClient = blobServiceClient.getBlobContainerClient(containerName);
+
+      // Get a reference to a blob
+      BlobClient blobClient = containerClient.getBlobClient(blobName);
+
+      // download the blob
+      message = blobClient.downloadContent().toObject(new TypeReference<Message<T>>() {
+      });
+    } catch (Exception e) {
+      logger.info(e.getMessage());
+    }
+    return message;
+
+  }
+
+  /**
+   * Drop message to blob storage.
+   * @param message represents Message
+   * @param logger represents Logger
+   */
+  public void dropToPersistantStorage(Message<T> message, Logger logger) {
+    try {
+
+      // Get message reference
+      MessageReference messageReference = (MessageReference) message.getMessageHeader().getData();
+
+      // Create a unique name for the container
+      String containerName = messageReference.getDataLocation();
+
+      // Create the container and return a container client object
+      BlobContainerClient containerClient = this.blobServiceClient
+          .getBlobContainerClient(containerName);
+      if (!containerClient.exists()) {
+        containerClient.create();
+      }
+
+      // Get a reference to a blob
+      BlobClient blobClient = containerClient.getBlobClient(messageReference.getDataFileName());
+
+      // Upload the blob
+      blobClient.upload(BinaryData.fromObject(message));
+    } catch (Exception e) {
+      logger.info(e.getMessage());
+    }
+
+  }
+
+}

cloud-claim-check-pattern/call-usage-app/src/test/java/com/iluwatar/claimcheckpattern/HttpResponseMessageMock.java

@@ -0,0 +1,105 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern;
+
+import com.microsoft.azure.functions.HttpResponseMessage;
+import com.microsoft.azure.functions.HttpStatus;
+import com.microsoft.azure.functions.HttpStatusType;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * The mock for HttpResponseMessage, can be used in unit tests to verify if the
+ * returned response by HTTP trigger function is correct or not.
+ */
+public class HttpResponseMessageMock implements HttpResponseMessage {
+    private int httpStatusCode;
+    private HttpStatusType httpStatus;
+    private Object body;
+    private Map<String, String> headers;
+
+    public HttpResponseMessageMock(HttpStatusType status, Map<String, String> headers, Object body) {
+        this.httpStatus = status;
+        this.httpStatusCode = status.value();
+        this.headers = headers;
+        this.body = body;
+    }
+
+    @Override
+    public HttpStatusType getStatus() {
+        return this.httpStatus;
+    }
+
+    @Override
+    public int getStatusCode() {
+        return httpStatusCode;
+    }
+
+    @Override
+    public String getHeader(String key) {
+        return this.headers.get(key);
+    }
+
+    @Override
+    public Object getBody() {
+        return this.body;
+    }
+
+    public static class HttpResponseMessageBuilderMock implements HttpResponseMessage.Builder {
+        private Object body;
+        private int httpStatusCode;
+        private Map<String, String> headers = new HashMap<>();
+        private HttpStatusType httpStatus;
+
+        public Builder status(HttpStatus status) {
+            this.httpStatusCode = status.value();
+            this.httpStatus = status;
+            return this;
+        }
+
+        @Override
+        public Builder status(HttpStatusType httpStatusType) {
+            this.httpStatusCode = httpStatusType.value();
+            this.httpStatus = httpStatusType;
+            return this;
+        }
+
+        @Override
+        public HttpResponseMessage.Builder header(String key, String value) {
+            this.headers.put(key, value);
+            return this;
+        }
+
+        @Override
+        public HttpResponseMessage.Builder body(Object body) {
+            this.body = body;
+            return this;
+        }
+
+        @Override
+        public HttpResponseMessage build() {
+            return new HttpResponseMessageMock(this.httpStatus, this.headers, this.body);
+        }
+    }
+}

cloud-claim-check-pattern/call-usage-app/src/test/java/com/iluwatar/claimcheckpattern/consumer/callcostprocessor/functions/UsageCostProcessorFunctionTest.java

@@ -0,0 +1,181 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.consumer.callcostprocessor.functions;
+
+import com.iluwatar.claimcheckpattern.HttpResponseMessageMock;
+import com.iluwatar.claimcheckpattern.domain.Message;
+import com.iluwatar.claimcheckpattern.domain.MessageBody;
+import com.iluwatar.claimcheckpattern.domain.MessageHeader;
+import com.iluwatar.claimcheckpattern.domain.MessageReference;
+import com.iluwatar.claimcheckpattern.domain.UsageCostDetail;
+import com.iluwatar.claimcheckpattern.domain.UsageDetail;
+import com.iluwatar.claimcheckpattern.utility.MessageHandlerUtility;
+import com.microsoft.azure.functions.ExecutionContext;
+import com.microsoft.azure.functions.HttpRequestMessage;
+import com.microsoft.azure.functions.HttpResponseMessage;
+import com.microsoft.azure.functions.HttpStatus;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.stubbing.Answer;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.time.OffsetDateTime;
+import java.util.*;
+import java.util.logging.Logger;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+/**
+ * Unit test for Function class.
+ */
+@ExtendWith(MockitoExtension.class)
+public class UsageCostProcessorFunctionTest {
+
+    @Mock
+    MessageHandlerUtility<UsageDetail> mockMessageHandlerUtilityForUsageADetail;
+    @Mock
+    MessageHandlerUtility<UsageCostDetail> mockMessageHandlerUtilityForUsageCostDetail;
+    @Mock
+    ExecutionContext context;
+
+    Message<UsageCostDetail> messageToDrop;
+    Message<UsageDetail> messageToRead;
+    MessageReference messageReference;
+    @InjectMocks
+    UsageCostProcessorFunction usageCostProcessorFunction;
+
+    @BeforeEach
+    public void setUp() {
+        var messageBodyUsageDetail = new MessageBody<UsageDetail>();
+        var usageDetailsList = new ArrayList<UsageDetail>();
+
+        var messageBodyUsageCostDetail = new MessageBody<UsageCostDetail>();
+        var usageCostDetailsList = new ArrayList<UsageCostDetail>();
+        for (int i = 0; i < 2; i++) {
+            var usageDetail = new UsageDetail();
+            usageDetail.setUserId("userId" + i);
+            usageDetail.setData(i + 1);
+            usageDetail.setDuration(i + 1);
+            usageDetailsList.add(usageDetail);
+
+            var usageCostDetail = new UsageCostDetail();
+            usageCostDetail.setUserId(usageDetail.getUserId());
+            usageCostDetail.setDataCost(usageDetail.getData() * 0.20);
+            usageCostDetail.setCallCost(usageDetail.getDuration() * 0.30);
+            usageCostDetailsList.add(usageCostDetail);
+        }
+        messageBodyUsageDetail.setData(usageDetailsList);
+        messageBodyUsageCostDetail.setData(usageCostDetailsList);
+
+        // Create message header
+        var messageHeader = new MessageHeader();
+        messageHeader.setId(UUID.randomUUID().toString());
+        messageHeader.setSubject("UsageDetailPublisher");
+        messageHeader.setTopic("usagecostprocessorfunction-topic");
+        messageHeader.setEventType("UsageDetail");
+        messageHeader.setEventTime(OffsetDateTime.now().toString());
+        this.messageReference = new MessageReference("callusageapp", "d8284456-dfff-4bd4-9cef-ea99f70f4835/input.json");
+        messageHeader.setData(messageReference);
+        messageHeader.setDataVersion("v1.0");
+
+        // Create entire message
+        messageToRead = new Message<>();
+        messageToRead.setMessageHeader(messageHeader);
+        messageToRead.setMessageBody(messageBodyUsageDetail);
+
+        messageToDrop = new Message<>();
+        messageToDrop.setMessageHeader(messageHeader);
+        messageToDrop.setMessageBody(messageBodyUsageCostDetail);
+
+    }
+
+    /**
+     * Unit test for HttpTriggerJava method.
+     */
+    @Test
+    public void shouldTriggerHttpAzureFunctionJavaWithSubscriptionValidationEventType() throws Exception {
+
+        // Setup
+        @SuppressWarnings("unchecked")
+        final HttpRequestMessage<Optional<String>> req = mock(HttpRequestMessage.class);
+        String fileAbsolutePath = getClass().getResource("/subscriptionValidationEvent.json").getPath()
+                .replaceAll("%20", " "), jsonBody = Files.readString(Paths.get(fileAbsolutePath)).replaceAll("\n", " ");
+        doReturn(Optional.of(jsonBody)).when(req).getBody();
+        doAnswer(new Answer<HttpResponseMessage.Builder>() {
+            @Override
+            public HttpResponseMessage.Builder answer(InvocationOnMock invocation) {
+                HttpStatus status = (HttpStatus) invocation.getArguments()[0];
+                return new HttpResponseMessageMock.HttpResponseMessageBuilderMock().status(status);
+            }
+        }).when(req).createResponseBuilder(any(HttpStatus.class));
+
+        final ExecutionContext context = mock(ExecutionContext.class);
+
+        // Invoke
+        final HttpResponseMessage ret = this.usageCostProcessorFunction.run(req, context);
+
+        // Verify
+        assertEquals(ret.getStatus(), HttpStatus.OK);
+    }
+
+    @Test
+    public void shouldTriggerHttpAzureFunctionJavaWithUsageDetailEventType() throws Exception {
+        // Setup
+        @SuppressWarnings("unchecked")
+        final HttpRequestMessage<Optional<String>> req = mock(HttpRequestMessage.class);
+        String fileAbsolutePath = getClass().getResource("/usageDetailEvent.json").getPath().replaceAll("%20", " "),
+                jsonBody = Files.readString(Paths.get(fileAbsolutePath)).replaceAll("\n", " ");
+        doReturn(Optional.of(jsonBody)).when(req).getBody();
+        doReturn(Logger.getGlobal()).when(context).getLogger();
+
+        when(this.mockMessageHandlerUtilityForUsageADetail.readFromPersistantStorage(any(MessageReference.class),
+                eq(Logger.getGlobal()))).thenReturn(messageToRead);
+        doAnswer(new Answer<HttpResponseMessage.Builder>() {
+            @Override
+            public HttpResponseMessage.Builder answer(InvocationOnMock invocation) {
+                HttpStatus status = (HttpStatus) invocation.getArguments()[0];
+                return new HttpResponseMessageMock.HttpResponseMessageBuilderMock().status(status);
+            }
+        }).when(req).createResponseBuilder(any(HttpStatus.class));
+
+        assertNotNull(this.mockMessageHandlerUtilityForUsageADetail);
+        assertEquals(this.messageToRead, this.mockMessageHandlerUtilityForUsageADetail
+                .readFromPersistantStorage(this.messageReference, Logger.getGlobal()));
+
+        // Invoke
+        final HttpResponseMessage ret = this.usageCostProcessorFunction.run(req, context);
+
+        // Verify
+        assertEquals(HttpStatus.OK, ret.getStatus());
+        assertEquals("Message is dropped successfully", ret.getBody());
+    }
+
+}

cloud-claim-check-pattern/call-usage-app/src/test/java/com/iluwatar/claimcheckpattern/producer/calldetails/functions/UsageDetailPublisherFunctionTest.java

@@ -0,0 +1,119 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.producer.calldetails.functions;
+
+import com.iluwatar.claimcheckpattern.HttpResponseMessageMock;
+import com.iluwatar.claimcheckpattern.domain.MessageHeader;
+import com.iluwatar.claimcheckpattern.domain.UsageDetail;
+import com.iluwatar.claimcheckpattern.utility.EventHandlerUtility;
+import com.iluwatar.claimcheckpattern.utility.MessageHandlerUtility;
+import com.microsoft.azure.functions.ExecutionContext;
+import com.microsoft.azure.functions.HttpRequestMessage;
+import com.microsoft.azure.functions.HttpResponseMessage;
+import com.microsoft.azure.functions.HttpStatus;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.mockito.stubbing.Answer;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.*;
+import java.util.logging.Logger;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+/**
+ * Unit test for Function class.
+ */
+@ExtendWith(MockitoExtension.class)
+public class UsageDetailPublisherFunctionTest {
+    @Mock
+    MessageHandlerUtility<UsageDetail> mockMessageHandlerUtility;
+    @Mock
+    EventHandlerUtility<MessageHeader> mockEventHandlerUtility;
+
+    @InjectMocks
+    UsageDetailPublisherFunction usageDetailPublisherFunction;
+
+    /**
+     * Unit test for HttpTriggerJava method.
+     */
+    @Test
+    public void shouldTriggerHttpAzureFunctionJavaWithSubscriptionValidationEventType() throws Exception {
+
+        // Setup
+        @SuppressWarnings("unchecked")
+        final HttpRequestMessage<Optional<String>> req = mock(HttpRequestMessage.class);
+        String fileAbsolutePath = getClass().getResource("/subscriptionValidationEvent.json").getPath()
+                .replaceAll("%20", " "), jsonBody = Files.readString(Paths.get(fileAbsolutePath)).replaceAll("\n", " ");
+        doReturn(Optional.of(jsonBody)).when(req).getBody();
+        doAnswer(new Answer<HttpResponseMessage.Builder>() {
+            @Override
+            public HttpResponseMessage.Builder answer(InvocationOnMock invocation) {
+                HttpStatus status = (HttpStatus) invocation.getArguments()[0];
+                return new HttpResponseMessageMock.HttpResponseMessageBuilderMock().status(status);
+            }
+        }).when(req).createResponseBuilder(any(HttpStatus.class));
+
+        final ExecutionContext context = mock(ExecutionContext.class);
+
+        // Invoke
+        final HttpResponseMessage ret = this.usageDetailPublisherFunction.run(req, context);
+
+        // Verify
+        assertEquals(ret.getStatus(), HttpStatus.OK);
+    }
+
+    @Test
+    public void shouldTriggerHttpAzureFunctionJavaWithUsageDetailEventType() throws Exception {
+
+        // Setup
+        @SuppressWarnings("unchecked")
+        final HttpRequestMessage<Optional<String>> req = mock(HttpRequestMessage.class);
+        String fileAbsolutePath = getClass().getResource("/usageDetailEvent.json").getPath().replaceAll("%20", " "),
+                jsonBody = Files.readString(Paths.get(fileAbsolutePath)).replaceAll("\n", " ");
+        doReturn(Optional.of(jsonBody)).when(req).getBody();
+        doAnswer(new Answer<HttpResponseMessage.Builder>() {
+            @Override
+            public HttpResponseMessage.Builder answer(InvocationOnMock invocation) {
+                HttpStatus status = (HttpStatus) invocation.getArguments()[0];
+                return new HttpResponseMessageMock.HttpResponseMessageBuilderMock().status(status);
+            }
+        }).when(req).createResponseBuilder(any(HttpStatus.class));
+
+        final ExecutionContext context = mock(ExecutionContext.class);
+        doReturn(Logger.getGlobal()).when(context).getLogger();
+
+        // Invoke
+        final HttpResponseMessage ret = this.usageDetailPublisherFunction.run(req, context);
+
+        // Verify
+        assertEquals(ret.getStatus(), HttpStatus.OK);
+    }
+
+}

cloud-claim-check-pattern/call-usage-app/src/test/java/com/iluwatar/claimcheckpattern/utility/EventHandlerUtilityTest.java

@@ -0,0 +1,70 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.utility;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+import com.azure.core.util.BinaryData;
+import com.azure.messaging.eventgrid.EventGridPublisherClient;
+import com.iluwatar.claimcheckpattern.domain.Message;
+import com.iluwatar.claimcheckpattern.domain.UsageDetail;
+import java.util.logging.Logger;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+public class EventHandlerUtilityTest {
+
+    @Mock
+    EventGridPublisherClient<BinaryData> mockCustomEventClient;
+
+    @InjectMocks
+    EventHandlerUtility<Message<UsageDetail>> eventHandlerUtility;
+
+    @BeforeEach
+    public void setUp() {
+
+        System.setProperty("EventGridURL", "https://www.dummyEndpoint.com/api/events");
+        System.setProperty("EventGridKey", "EventGridURL");
+    }
+
+    @Test
+    void shouldPublishEvent() {
+        doNothing().when(mockCustomEventClient).sendEvent(any(BinaryData.class));
+        eventHandlerUtility.publishEvent(null, Logger.getLogger("logger"));
+        verify(mockCustomEventClient, times(1)).sendEvent(any(BinaryData.class));
+
+    }
+
+    @Test
+    void shouldPublishEventWithNullLogger() {
+        eventHandlerUtility.publishEvent(null, null);
+        verify(mockCustomEventClient, times(1)).sendEvent(any(BinaryData.class));
+    }
+}

cloud-claim-check-pattern/call-usage-app/src/test/java/com/iluwatar/claimcheckpattern/utility/MessageHandlerUtilityTest.java

@@ -0,0 +1,114 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2021 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package com.iluwatar.claimcheckpattern.utility;
+
+import com.azure.storage.blob.BlobClient;
+import com.azure.storage.blob.BlobContainerClient;
+import com.azure.storage.blob.BlobServiceClient;
+import com.iluwatar.claimcheckpattern.domain.*;
+import com.iluwatar.claimcheckpattern.utility.MessageHandlerUtility;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import java.time.OffsetDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import java.util.UUID;
+import java.util.logging.Logger;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+public class MessageHandlerUtilityTest {
+    @Mock
+    private BlobClient mockBlobClient;
+
+    @Mock
+    private BlobContainerClient mockContainerClient;
+
+    @Mock
+    private BlobServiceClient mockBlobServiceClient;
+
+    @InjectMocks
+    private MessageHandlerUtility<UsageDetail> messageHandlerUtility;
+
+    private Message<UsageDetail> messageToPublish;
+    private MessageReference messageReference;
+
+    @BeforeEach
+    public void setUp() {
+        System.setProperty("BlobStorageConnectionString", "https://www.dummyEndpoint.com/api/blobs");
+
+        var messageBody = new MessageBody<UsageDetail>();
+        var usageDetailsList = new ArrayList<UsageDetail>();
+        var random = new Random();
+        for (int i = 0; i < 51; i++) {
+            var usageDetail = new UsageDetail();
+            usageDetail.setUserId("userId" + i);
+            usageDetail.setData(random.nextInt(500));
+            usageDetail.setDuration(random.nextInt(500));
+
+            usageDetailsList.add(usageDetail);
+        }
+        messageBody.setData(usageDetailsList);
+
+        // Create message header
+        var messageHeader = new MessageHeader();
+        messageHeader.setId(UUID.randomUUID().toString());
+        messageHeader.setSubject("UsageDetailPublisher");
+        messageHeader.setTopic("usagecostprocessorfunction-topic");
+        messageHeader.setEventType("UsageDetail");
+        messageHeader.setEventTime(OffsetDateTime.now().toString());
+        this.messageReference = new MessageReference("callusageapp", messageHeader.getId() + "/input.json");
+        messageHeader.setData(messageReference);
+        messageHeader.setDataVersion("v1.0");
+
+        // Create entire message
+        this.messageToPublish = new Message<>();
+        this.messageToPublish.setMessageHeader(messageHeader);
+        this.messageToPublish.setMessageBody(messageBody);
+
+        when(mockContainerClient.getBlobClient(anyString())).thenReturn(mockBlobClient);
+        when(mockBlobServiceClient.getBlobContainerClient(anyString())).thenReturn(mockContainerClient);
+    }
+
+    @Test
+    void shouldDropMessageToPersistantStorage() {
+        messageHandlerUtility.dropToPersistantStorage(messageToPublish, Logger.getLogger("logger"));
+        verify(mockBlobServiceClient, times(1)).getBlobContainerClient(anyString());
+        // verify(mockContainerClient, times(0)).exists();
+    }
+
+    @Test
+    void shouldReadMessageFromPersistantStorage() {
+
+        messageHandlerUtility.readFromPersistantStorage(messageReference, Logger.getLogger("logger"));
+        verify(mockBlobServiceClient, times(1)).getBlobContainerClient(anyString());
+    }
+}

cloud-claim-check-pattern/call-usage-app/src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker

@@ -0,0 +1 @@
+mock-maker-inline

cloud-claim-check-pattern/call-usage-app/src/test/resources/subscriptionValidationEvent.json

@@ -0,0 +1,15 @@
+[
+  {
+    "data": {
+      "validationCode": "C12F266E-79D9-4C0A-9922-5EF6201A34C2",
+      "validationUrl": "https://rp-centralindia.eventgrid.azure.net:553/eventsubscriptions/usagedetailpublisherfunction-subscription/validate?idu003dC12F266E-79D9-4C0A-9922-5EF6201A34C2u0026tu003d2021-10-26T08:10:52.4999377Zu0026apiVersionu003d2020-10-15-previewu0026tokenu003d30kEVoL8rAOWzQv0buurhrKnbP%2bGMtHObbA%2bax6wb4Y%3d"
+    },
+    "dataVersion": "2",
+    "eventTime": "2021-10-26T08:10:52.4999377Z",
+    "eventType": "Microsoft.EventGrid.SubscriptionValidationEvent",
+    "id": "e2a8466b-3dc0-46b7-bb7d-b999e51a2848",
+    "metadataVersion": "1",
+    "subject": "",
+    "topic": "/subscriptions/0fef643d-a6b1-48f9-a256-53fbd0d22f48/resourceGroups/resource-group-ccp/providers/Microsoft.EventGrid/domains/event-grid-domains-ccp/topics/usagedetailpublisherfunction-topic"
+  }
+]

cloud-claim-check-pattern/call-usage-app/src/test/resources/usageDetailEvent.json

@@ -0,0 +1,15 @@
+[
+  {
+    "data": {
+      "dataFileName": "d8284456-dfff-4bd4-9cef-ea99f70f4835/input.json",
+      "dataLocation": "callusageapp"
+    },
+    "dataVersion": "v1.0",
+    "eventTime": "2021-10-25T19:17:15.7468501Z",
+    "eventType": "UsageDetail",
+    "id": "d8284456-dfff-4bd4-9cef-ea99f70f4835",
+    "metadataVersion": "1",
+    "subject": "UsageDetailPublisher",
+    "topic": "/subscriptions/0fef643d-a6b1-48f9-a256-ea99f70f4835/resourceGroups/resource-group-ccp/providers/Microsoft.EventGrid/domains/event-grid-domains-ccp/topics/usagecostprocessorfunction-topic"
+  }
+]

cloud-claim-check-pattern/etc/claim-check-pattern.urm.puml

@@ -0,0 +1,117 @@
+@startuml
+class UsageDetailPublisherFunction [[java:com.iluwatar.producer.calldetails.functions]] {
+	-messageHandlerUtility: MessageHandlerUtility<UsageDetail>
+	-eventHandlerUtility: EventHandlerUtility<MessageHeader>
+	+run(): HttpResponseMessage
+}
+
+class UsageCostProcessorFunction [[java:com.iluwatar.consumer.callcostprocessor.functions]] {
+	-messageHandlerUtilityForUsageDetail: MessageHandlerUtility<UsageDetail>
+        -messageHandlerUtilityForUsageCostDetail: MessageHandlerUtility<UsageCostDetail>
+	+run(): HttpResponseMessage
+}
+
+class "MessageHandlerUtility<T>" as MessageHandlerUtility_T [[java:com.iluwatar.claimcheckpattern.utility]] {
+	+readFromPersistantStorage(messageReference: MessageReference, logger: Logger): Message
+	+dropToPersistantStorage(message: Message, logger: Logger): void
+}
+
+class "EventHandlerUtility<T>" as EventHandlerUtility_T [[java:com.callusage.utility.PersistentLocalStorageUtility]] {
+	+publishEvent(customEvent: T, logger: Logger): void
+}
+
+class "Message<T>" as Message_T [[java:com.iluwatar.claimcheckpattern.domain]] {
+	-messageHeader: MessageHeader
+	-messageData: MessageData<T>
+	+Message(messageHeader: MessageHeader, messageData: MessageData<T>)
+	+getMessageData(): MessageData<T>
+	+getMessageHeader(): MessageHeader
+}
+
+
+class MessageHeader [[java:com.iluwatar.claimcheckpattern.domain]] {
+	-id: String
+	-subject: String
+	-topic: String
+	-eventType: String
+	-eventTime: String
+	-data: Object
+	-dataVersion: String
+	+getId(): String
+	+setId(id: String): void
+	+getSubject(): String
+	+setSubject(subject: String): void
+	+getTopic(): String
+	+setTopic(topic: String): void
+	+getEventType(): String
+        +setEventType(eventType: String): void
+        +getEventTime(): String
+	+setEventTime(eventTime: String): void
+        +getData(): Object
+	+setData(data: Object): void
+        +getDataVersion(): String
+	+setDataVersion(dataVersion:String): void
+
+}
+
+
+class "MessageBody<T>" as MessageBody_T [[java:com.iluwatar.claimcheckpattern.domain]] {
+	-data: List[] T
+	+getData(): List[] T
+	+setData(data:List[] T): void
+}
+
+class MessageReference [[java:com.iluwatar.claimcheckpattern.domain]] {
+	-dataLocation: String
+	-dataFileName: String
+	+getDataLocation(): String
+	+setDataLocation(dataLocation:String): void
+	+getDataFileName(): String
+	+setDataFileName(dataFileName:String): void
+}
+
+class UsageDetail [[java:com.iluwatar.claimcheckpattern.domain]] {
+	-userId: String
+	-duration: int
+	-data: int
+	+getUserId(): String
+	+setUserId(userId: String): void
+	+getDuration(): long
+	+setDuration(duration: long): void
+	+getData(): long
+	+setData(data: long): void
+}
+
+class UsageCostDetail [[java:com.iluwatar.claimcheckpattern.domain]] {
+	-userId: String
+	-callCost: double
+	-dataCost: double
+	+getUserId(): String
+	+setUserId(userId: String): void
+	+getCallCost(): double
+	+setCallCost(callCost:double): void
+	+getDataCost(): double
+	+setDataCost(dataCost:double) : void
+}
+
+
+
+
+
+
+
+Message_T "1" *-- "1" MessageHeader : has
+Message_T "1" *-- "1" MessageBody_T : has
+MessageHeader "1" *-- "1" MessageReference : has as data object
+MessageBody_T "1" *-- "1" UsageDetail: has
+MessageBody_T "1" *-- "1" UsageCostDetail: has
+
+EventHandlerUtility_T "1" *-- "1" MessageHeader: has
+MessageHandlerUtility_T "1" *-- "1" Message_T: has
+
+UsageDetailPublisherFunction "1" *-- "1" MessageHandlerUtility_T : has
+UsageDetailPublisherFunction "1" *-- "1" EventHandlerUtility_T : has
+
+UsageCostProcessorFunction "1" *-- "1" MessageHandlerUtility_T : has
+UsageCostProcessorFunction "1" *-- "1" MessageHandlerUtility_T : has
+@enduml

cloud-claim-check-pattern/pom.xml

@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    The MIT License
+    Copyright © 2014-2021 Ilkka Seppälä
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+	 <parent>
+	    <groupId>com.iluwatar</groupId>
+	    <artifactId>java-design-patterns</artifactId>
+	    <version>1.25.0-SNAPSHOT</version>		
+	 </parent>
+    
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>claim-check-pattern</artifactId>
+    <packaging>pom</packaging>
+
+    <modules>
+        <module>call-usage-app</module>
+    </modules>
+    <dependencies>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.8.8</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>5.8.1</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-junit-jupiter</artifactId>
+            <version>4.0.0</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-inline</artifactId>
+            <version>4.0.0</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+    </project>

collection-pipeline/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>collection-pipeline</artifactId>
   <dependencies>

combinator/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>combinator</artifactId>
   <dependencies>

command/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>command</artifactId>
   <dependencies>

command/src/main/java/com/iluwatar/command/Wizard.java

@@ -36,9 +36,6 @@ public class Wizard {
   private final Deque<Runnable> undoStack = new LinkedList<>();
   private final Deque<Runnable> redoStack = new LinkedList<>();
 
-  public Wizard() {
-  }
-
   /**
    * Cast spell.
    */

commander/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>commander</artifactId>
   <dependencies>

commander/src/main/java/com/iluwatar/commander/Commander.java

@@ -90,6 +90,13 @@ public class Commander {
   private static final Logger LOG = LoggerFactory.getLogger(Commander.class);
   //we could also have another db where it stores all orders
 
+  private static final String ORDER_ID = "Order {}";
+  private static final String REQUEST_ID = " request Id: {}";
+  private static final String ERROR_CONNECTING_MSG_SVC =
+          ": Error in connecting to messaging service ";
+  private static final String TRY_CONNECTING_MSG_SVC =
+          ": Trying to connect to messaging service..";
+
   Commander(EmployeeHandle empDb, PaymentService paymentService, ShippingService shippingService,
             MessagingService messagingService, QueueDatabase qdb, int numOfRetries,
             long retryDuration, long queueTime, long queueTaskTime, long paymentTime,
@@ -118,17 +125,17 @@ public class Commander {
     Retry.Operation op = (l) -> {
       if (!l.isEmpty()) {
         if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
-          LOG.debug("Order " + order.id + ": Error in connecting to shipping service, "
-              + "trying again..");
+          LOG.debug(ORDER_ID + ": Error in connecting to shipping service, "
+              + "trying again..", order.id);
         } else {
-          LOG.debug("Order " + order.id + ": Error in creating shipping request..");
+          LOG.debug(ORDER_ID + ": Error in creating shipping request..", order.id);
         }
         throw l.remove(0);
       }
       String transactionId = shippingService.receiveRequest(order.item, order.user.address);
       //could save this transaction id in a db too
-      LOG.info("Order " + order.id + ": Shipping placed successfully, transaction id: "
-          + transactionId);
+      LOG.info(ORDER_ID + ": Shipping placed successfully, transaction id: {}",
+              order.id, transactionId);
       LOG.info("Order has been placed and will be shipped to you. Please wait while we make your"
           + " payment... ");
       sendPaymentRequest(order);
@@ -138,19 +145,19 @@ public class Commander {
         LOG.info("Shipping is currently not possible to your address. We are working on the problem"
             + " and will get back to you asap.");
         finalSiteMsgShown = true;
-        LOG.info("Order " + order.id + ": Shipping not possible to address, trying to add problem "
-            + "to employee db..");
+        LOG.info(ORDER_ID + ": Shipping not possible to address, trying to add problem "
+            + "to employee db..", order.id);
         employeeHandleIssue(o);
       } else if (ItemUnavailableException.class.isAssignableFrom(err.getClass())) {
         LOG.info("This item is currently unavailable. We will inform you as soon as the item "
             + "becomes available again.");
         finalSiteMsgShown = true;
-        LOG.info("Order " + order.id + ": Item " + order.item + " unavailable, trying to add "
-            + "problem to employee handle..");
+        LOG.info(ORDER_ID + ": Item {}" + " unavailable, trying to add "
+            + "problem to employee handle..", order.id, order.item);
         employeeHandleIssue(o);
       } else {
         LOG.info("Sorry, there was a problem in creating your order. Please try later.");
-        LOG.error("Order " + order.id + ": Shipping service unavailable, order not placed..");
+        LOG.error(ORDER_ID + ": Shipping service unavailable, order not placed..", order.id);
         finalSiteMsgShown = true;
       }
     };
@@ -164,7 +171,7 @@ public class Commander {
       if (order.paid.equals(PaymentStatus.TRYING)) {
         order.paid = PaymentStatus.NOT_DONE;
         sendPaymentFailureMessage(order);
-        LOG.error("Order " + order.id + ": Payment time for order over, failed and returning..");
+        LOG.error(ORDER_ID + ": Payment time for order over, failed and returning..", order.id);
       } //if succeeded or failed, would have been dequeued, no attempt to make payment     
       return;
     }
@@ -173,17 +180,18 @@ public class Commander {
       Retry.Operation op = (l) -> {
         if (!l.isEmpty()) {
           if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
-            LOG.debug("Order " + order.id + ": Error in connecting to payment service,"
-                + " trying again..");
+            LOG.debug(ORDER_ID + ": Error in connecting to payment service,"
+                + " trying again..", order.id);
           } else {
-            LOG.debug("Order " + order.id + ": Error in creating payment request..");
+            LOG.debug(ORDER_ID + ": Error in creating payment request..", order.id);
           }
           throw l.remove(0);
         }
         if (order.paid.equals(PaymentStatus.TRYING)) {
           var transactionId = paymentService.receiveRequest(order.price);
           order.paid = PaymentStatus.DONE;
-          LOG.info("Order " + order.id + ": Payment successful, transaction Id: " + transactionId);
+          LOG.info(ORDER_ID + ": Payment successful, transaction Id: {}",
+                  order.id, transactionId);
           if (!finalSiteMsgShown) {
             LOG.info("Payment made successfully, thank you for shopping with us!!");
             finalSiteMsgShown = true;
@@ -199,7 +207,7 @@ public class Commander {
                 + "Meanwhile, your order has been converted to COD and will be shipped.");
             finalSiteMsgShown = true;
           }
-          LOG.error("Order " + order.id + ": Payment details incorrect, failed..");
+          LOG.error(ORDER_ID + ": Payment details incorrect, failed..", order.id);
           o.paid = PaymentStatus.NOT_DONE;
           sendPaymentFailureMessage(o);
         } else {
@@ -209,7 +217,7 @@ public class Commander {
                   + "asap. Don't worry, your order has been placed and will be shipped.");
               finalSiteMsgShown = true;
             }
-            LOG.warn("Order " + order.id + ": Payment error, going to queue..");
+            LOG.warn(ORDER_ID + ": Payment error, going to queue..", order.id);
             sendPaymentPossibleErrorMsg(o);
           }
           if (o.paid.equals(PaymentStatus.TRYING) && System
@@ -234,7 +242,7 @@ public class Commander {
     if (System.currentTimeMillis() - qt.order.createdTime >= this.queueTime) {
       // since payment time is lesser than queuetime it would have already failed..
       // additional check not needed
-      LOG.trace("Order " + qt.order.id + ": Queue time for order over, failed..");
+      LOG.trace(ORDER_ID + ": Queue time for order over, failed..", qt.order.id);
       return;
     } else if (qt.taskType.equals(TaskType.PAYMENT) && !qt.order.paid.equals(PaymentStatus.TRYING)
         || qt.taskType.equals(TaskType.MESSAGING) && (qt.messageType == 1
@@ -242,30 +250,30 @@ public class Commander {
         || qt.order.messageSent.equals(MessageSent.PAYMENT_FAIL)
         || qt.order.messageSent.equals(MessageSent.PAYMENT_SUCCESSFUL))
         || qt.taskType.equals(TaskType.EMPLOYEE_DB) && qt.order.addedToEmployeeHandle) {
-      LOG.trace("Order " + qt.order.id + ": Not queueing task since task already done..");
+      LOG.trace(ORDER_ID + ": Not queueing task since task already done..", qt.order.id);
       return;
     }
     var list = queue.exceptionsList;
     Thread t = new Thread(() -> {
       Retry.Operation op = (list1) -> {
         if (!list1.isEmpty()) {
-          LOG.warn("Order " + qt.order.id + ": Error in connecting to queue db, trying again..");
+          LOG.warn(ORDER_ID + ": Error in connecting to queue db, trying again..", qt.order.id);
           throw list1.remove(0);
         }
         queue.add(qt);
         queueItems++;
-        LOG.info("Order " + qt.order.id + ": " + qt.getType() + " task enqueued..");
+        LOG.info(ORDER_ID + ": {}" + " task enqueued..", qt.order.id, qt.getType());
         tryDoingTasksInQueue();
       };
       Retry.HandleErrorIssue<QueueTask> handleError = (qt1, err) -> {
         if (qt1.taskType.equals(TaskType.PAYMENT)) {
           qt1.order.paid = PaymentStatus.NOT_DONE;
           sendPaymentFailureMessage(qt1.order);
-          LOG.error("Order " + qt1.order.id + ": Unable to enqueue payment task,"
-              + " payment failed..");
+          LOG.error(ORDER_ID + ": Unable to enqueue payment task,"
+              + " payment failed..", qt1.order.id);
         }
-        LOG.error("Order " + qt1.order.id + ": Unable to enqueue task of type " + qt1.getType()
-            + ", trying to add to employee handle..");
+        LOG.error(ORDER_ID + ": Unable to enqueue task of type {}"
+                + ", trying to add to employee handle..", qt1.order.id, qt1.getType());
         employeeHandleIssue(qt1.order);
       };
       var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
@@ -328,7 +336,7 @@ public class Commander {
 
   private void sendSuccessMessage(Order order) {
     if (System.currentTimeMillis() - order.createdTime >= this.messageTime) {
-      LOG.trace("Order " + order.id + ": Message time for order over, returning..");
+      LOG.trace(ORDER_ID + ": Message time for order over, returning..", order.id);
       return;
     }
     var list = messagingService.exceptionsList;
@@ -354,8 +362,8 @@ public class Commander {
         && System.currentTimeMillis() - o.createdTime < messageTime) {
       var qt = new QueueTask(order, TaskType.MESSAGING, 2);
       updateQueue(qt);
-      LOG.info("Order " + order.id + ": Error in sending Payment Success message, trying to"
-          + " queue task and add to employee handle..");
+      LOG.info(ORDER_ID + ": Error in sending Payment Success message, trying to"
+          + " queue task and add to employee handle..", order.id);
       employeeHandleIssue(order);
     }
   }
@@ -364,11 +372,11 @@ public class Commander {
     return (l) -> {
       if (!l.isEmpty()) {
         if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
-          LOG.debug("Order " + order.id + ": Error in connecting to messaging service "
-              + "(Payment Success msg), trying again..");
+          LOG.debug(ORDER_ID + ERROR_CONNECTING_MSG_SVC
+              + "(Payment Success msg), trying again..", order.id);
         } else {
-          LOG.debug("Order " + order.id + ": Error in creating Payment Success"
-              + " messaging request..");
+          LOG.debug(ORDER_ID + ": Error in creating Payment Success"
+              + " messaging request..", order.id);
         }
         throw l.remove(0);
       }
@@ -376,15 +384,15 @@ public class Commander {
           && !order.messageSent.equals(MessageSent.PAYMENT_SUCCESSFUL)) {
         var requestId = messagingService.receiveRequest(2);
         order.messageSent = MessageSent.PAYMENT_SUCCESSFUL;
-        LOG.info("Order " + order.id + ": Payment Success message sent,"
-            + " request Id: " + requestId);
+        LOG.info(ORDER_ID + ": Payment Success message sent,"
+            + REQUEST_ID, order.id, requestId);
       }
     };
   }
 
   private void sendPaymentFailureMessage(Order order) {
     if (System.currentTimeMillis() - order.createdTime >= this.messageTime) {
-      LOG.trace("Order " + order.id + ": Message time for order over, returning..");
+      LOG.trace(ORDER_ID + ": Message time for order over, returning..", order.id);
       return;
     }
     var list = messagingService.exceptionsList;
@@ -412,8 +420,8 @@ public class Commander {
         && System.currentTimeMillis() - o.createdTime < messageTime) {
       var qt = new QueueTask(order, TaskType.MESSAGING, 0);
       updateQueue(qt);
-      LOG.warn("Order " + order.id + ": Error in sending Payment Failure message, "
-          + "trying to queue task and add to employee handle..");
+      LOG.warn(ORDER_ID + ": Error in sending Payment Failure message, "
+              + "trying to queue task and add to employee handle..", order.id);
       employeeHandleIssue(o);
     }
   }
@@ -421,11 +429,11 @@ public class Commander {
   private void handlePaymentFailureRetryOperation(Order order, List<Exception> l) throws Exception {
     if (!l.isEmpty()) {
       if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
-        LOG.debug("Order " + order.id + ": Error in connecting to messaging service "
-            + "(Payment Failure msg), trying again..");
+        LOG.debug(ORDER_ID + ERROR_CONNECTING_MSG_SVC
+            + "(Payment Failure msg), trying again..", order.id);
       } else {
-        LOG.debug("Order " + order.id + ": Error in creating Payment Failure"
-            + " message request..");
+        LOG.debug(ORDER_ID + ": Error in creating Payment Failure"
+            + " message request..", order.id);
       }
       throw l.remove(0);
     }
@@ -433,8 +441,8 @@ public class Commander {
         && !order.messageSent.equals(MessageSent.PAYMENT_SUCCESSFUL)) {
       var requestId = messagingService.receiveRequest(0);
       order.messageSent = MessageSent.PAYMENT_FAIL;
-      LOG.info("Order " + order.id + ": Payment Failure message sent successfully,"
-          + " request Id: " + requestId);
+      LOG.info(ORDER_ID + ": Payment Failure message sent successfully,"
+          + REQUEST_ID, order.id, requestId);
     }
   }
 
@@ -469,7 +477,7 @@ public class Commander {
       var qt = new QueueTask(order, TaskType.MESSAGING, 1);
       updateQueue(qt);
       LOG.warn("Order " + order.id + ": Error in sending Payment Error message, "
-          + "trying to queue task and add to employee handle..");
+              + "trying to queue task and add to employee handle..");
       employeeHandleIssue(o);
     }
   }
@@ -478,11 +486,11 @@ public class Commander {
       throws Exception {
     if (!l.isEmpty()) {
       if (DatabaseUnavailableException.class.isAssignableFrom(l.get(0).getClass())) {
-        LOG.debug("Order " + order.id + ": Error in connecting to messaging service "
-            + "(Payment Error msg), trying again..");
+        LOG.debug(ORDER_ID + ERROR_CONNECTING_MSG_SVC
+            + "(Payment Error msg), trying again..", order.id);
       } else {
-        LOG.debug("Order " + order.id + ": Error in creating Payment Error"
-            + " messaging request..");
+        LOG.debug(ORDER_ID + ": Error in creating Payment Error"
+            + " messaging request..", order.id);
       }
       throw l.remove(0);
     }
@@ -490,28 +498,28 @@ public class Commander {
         .equals(MessageSent.NONE_SENT)) {
       var requestId = messagingService.receiveRequest(1);
       order.messageSent = MessageSent.PAYMENT_TRYING;
-      LOG.info("Order " + order.id + ": Payment Error message sent successfully,"
-          + " request Id: " + requestId);
+      LOG.info(ORDER_ID + ": Payment Error message sent successfully,"
+          + REQUEST_ID, order.id, requestId);
     }
   }
 
   private void employeeHandleIssue(Order order) {
     if (System.currentTimeMillis() - order.createdTime >= this.employeeTime) {
-      LOG.trace("Order " + order.id + ": Employee handle time for order over, returning..");
+      LOG.trace(ORDER_ID + ": Employee handle time for order over, returning..", order.id);
       return;
     }
     var list = employeeDb.exceptionsList;
     var t = new Thread(() -> {
       Retry.Operation op = (l) -> {
         if (!l.isEmpty()) {
-          LOG.warn("Order " + order.id + ": Error in connecting to employee handle,"
-              + " trying again..");
+          LOG.warn(ORDER_ID + ": Error in connecting to employee handle,"
+              + " trying again..", order.id);
           throw l.remove(0);
         }
         if (!order.addedToEmployeeHandle) {
           employeeDb.receiveRequest(order);
           order.addedToEmployeeHandle = true;
-          LOG.info("Order " + order.id + ": Added order to employee database");
+          LOG.info(ORDER_ID + ": Added order to employee database", order.id);
         }
       };
       Retry.HandleErrorIssue<Order> handleError = (o, err) -> {
@@ -519,8 +527,8 @@ public class Commander {
             .currentTimeMillis() - order.createdTime < employeeTime) {
           var qt = new QueueTask(order, TaskType.EMPLOYEE_DB, -1);
           updateQueue(qt);
-          LOG.warn("Order " + order.id + ": Error in adding to employee db,"
-              + " trying to queue task..");
+          LOG.warn(ORDER_ID + ": Error in adding to employee db,"
+              + " trying to queue task..", order.id);
         }
       };
       var r = new Retry<>(op, handleError, numOfRetries, retryDuration,
@@ -538,51 +546,51 @@ public class Commander {
     if (queueItems != 0) {
       var qt = queue.peek(); //this should probably be cloned here
       //this is why we have retry for doTasksInQueue
-      LOG.trace("Order " + qt.order.id + ": Started doing task of type " + qt.getType());
+      LOG.trace(ORDER_ID + ": Started doing task of type {}", qt.order.id, qt.getType());
       if (qt.getFirstAttemptTime() == -1) {
         qt.setFirstAttemptTime(System.currentTimeMillis());
       }
       if (System.currentTimeMillis() - qt.getFirstAttemptTime() >= queueTaskTime) {
         tryDequeue();
-        LOG.trace("Order " + qt.order.id + ": This queue task of type " + qt.getType()
-            + " does not need to be done anymore (timeout), dequeue..");
+        LOG.trace(ORDER_ID + ": This queue task of type {}"
+            + " does not need to be done anymore (timeout), dequeue..", qt.order.id, qt.getType());
       } else {
         if (qt.taskType.equals(TaskType.PAYMENT)) {
           if (!qt.order.paid.equals(PaymentStatus.TRYING)) {
             tryDequeue();
-            LOG.trace("Order " + qt.order.id + ": This payment task already done, dequeueing..");
+            LOG.trace(ORDER_ID + ": This payment task already done, dequeueing..", qt.order.id);
           } else {
             sendPaymentRequest(qt.order);
-            LOG.debug("Order " + qt.order.id + ": Trying to connect to payment service..");
+            LOG.debug(ORDER_ID + ": Trying to connect to payment service..", qt.order.id);
           }
         } else if (qt.taskType.equals(TaskType.MESSAGING)) {
           if (qt.order.messageSent.equals(MessageSent.PAYMENT_FAIL)
               || qt.order.messageSent.equals(MessageSent.PAYMENT_SUCCESSFUL)) {
             tryDequeue();
-            LOG.trace("Order " + qt.order.id + ": This messaging task already done, dequeue..");
+            LOG.trace(ORDER_ID + ": This messaging task already done, dequeue..", qt.order.id);
           } else if (qt.messageType == 1 && (!qt.order.messageSent.equals(MessageSent.NONE_SENT)
               || !qt.order.paid.equals(PaymentStatus.TRYING))) {
             tryDequeue();
-            LOG.trace("Order " + qt.order.id + ": This messaging task does not need to be done,"
-                + " dequeue..");
+            LOG.trace(ORDER_ID + ": This messaging task does not need to be done,"
+                + " dequeue..", qt.order.id);
           } else if (qt.messageType == 0) {
             sendPaymentFailureMessage(qt.order);
-            LOG.debug("Order " + qt.order.id + ": Trying to connect to messaging service..");
+            LOG.debug(ORDER_ID + TRY_CONNECTING_MSG_SVC, qt.order.id);
           } else if (qt.messageType == 1) {
             sendPaymentPossibleErrorMsg(qt.order);
-            LOG.debug("Order " + qt.order.id + ": Trying to connect to messaging service..");
+            LOG.debug(ORDER_ID + TRY_CONNECTING_MSG_SVC, qt.order.id);
           } else if (qt.messageType == 2) {
             sendSuccessMessage(qt.order);
-            LOG.debug("Order " + qt.order.id + ": Trying to connect to messaging service..");
+            LOG.debug(ORDER_ID + TRY_CONNECTING_MSG_SVC, qt.order.id);
           }
         } else if (qt.taskType.equals(TaskType.EMPLOYEE_DB)) {
           if (qt.order.addedToEmployeeHandle) {
             tryDequeue();
-            LOG.trace("Order " + qt.order.id + ": This employee handle task already done,"
-                + " dequeue..");
+            LOG.trace(ORDER_ID + ": This employee handle task already done,"
+                + " dequeue..", qt.order.id);
           } else {
             employeeHandleIssue(qt.order);
-            LOG.debug("Order " + qt.order.id + ": Trying to connect to employee handle..");
+            LOG.debug(ORDER_ID + ": Trying to connect to employee handle..", qt.order.id);
           }
         }
       }

commander/src/test/java/com/iluwatar/commander/CommanderTest.java

@@ -0,0 +1,526 @@
+package com.iluwatar.commander;
+
+import com.iluwatar.commander.employeehandle.EmployeeDatabase;
+import com.iluwatar.commander.employeehandle.EmployeeHandle;
+import com.iluwatar.commander.exceptions.DatabaseUnavailableException;
+import com.iluwatar.commander.exceptions.ItemUnavailableException;
+import com.iluwatar.commander.exceptions.PaymentDetailsErrorException;
+import com.iluwatar.commander.exceptions.ShippingNotPossibleException;
+import com.iluwatar.commander.messagingservice.MessagingDatabase;
+import com.iluwatar.commander.messagingservice.MessagingService;
+import com.iluwatar.commander.paymentservice.PaymentDatabase;
+import com.iluwatar.commander.paymentservice.PaymentService;
+import com.iluwatar.commander.queue.QueueDatabase;
+import com.iluwatar.commander.shippingservice.ShippingDatabase;
+import com.iluwatar.commander.shippingservice.ShippingService;
+
+import org.junit.jupiter.api.Test;
+import org.junit.platform.commons.util.StringUtils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+class CommanderTest {
+
+    private final int numOfRetries = 1;
+    private final long retryDuration = 1_000;
+    private long queueTime = 1_00;
+    private long queueTaskTime = 1_000;
+    private long paymentTime = 6_000;
+    private long messageTime = 5_000;
+    private long employeeTime = 2_000;
+
+    private static final List<Exception> exceptionList = new ArrayList<>();
+
+    static {
+        exceptionList.add(new DatabaseUnavailableException());
+        exceptionList.add(new ShippingNotPossibleException());
+        exceptionList.add(new ItemUnavailableException());
+        exceptionList.add(new PaymentDetailsErrorException());
+        exceptionList.add(new IllegalStateException());
+    }
+
+    private Commander buildCommanderObject() {
+        return buildCommanderObject(false);
+    }
+
+    private Commander buildCommanderObject(boolean nonPaymentException) {
+        PaymentService paymentService = new PaymentService
+                (new PaymentDatabase(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException());
+
+        ShippingService shippingService;
+        MessagingService messagingService;
+        if (nonPaymentException) {
+            shippingService = new ShippingService(new ShippingDatabase(), new DatabaseUnavailableException());
+            messagingService = new MessagingService(new MessagingDatabase(), new DatabaseUnavailableException());
+
+        } else {
+            shippingService = new ShippingService(new ShippingDatabase(), new DatabaseUnavailableException());
+            messagingService = new MessagingService(new MessagingDatabase(), new DatabaseUnavailableException());
+
+        }
+        var employeeHandle = new EmployeeHandle
+                (new EmployeeDatabase(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException());
+        var qdb = new QueueDatabase
+                (new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException());
+        return new Commander(employeeHandle, paymentService, shippingService,
+                messagingService, qdb, numOfRetries, retryDuration,
+                queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
+    }
+
+    private Commander buildCommanderObjectVanilla() {
+        PaymentService paymentService = new PaymentService
+                (new PaymentDatabase(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException());
+        var shippingService = new ShippingService(new ShippingDatabase());
+        var messagingService = new MessagingService(new MessagingDatabase());
+        var employeeHandle = new EmployeeHandle
+                (new EmployeeDatabase(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException());
+        var qdb = new QueueDatabase
+                (new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException(),
+                        new DatabaseUnavailableException(), new DatabaseUnavailableException());
+        return new Commander(employeeHandle, paymentService, shippingService,
+                messagingService, qdb, numOfRetries, retryDuration,
+                queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
+    }
+
+    private Commander buildCommanderObjectUnknownException() {
+        PaymentService paymentService = new PaymentService
+                (new PaymentDatabase(), new IllegalStateException());
+        var shippingService = new ShippingService(new ShippingDatabase());
+        var messagingService = new MessagingService(new MessagingDatabase());
+        var employeeHandle = new EmployeeHandle
+                (new EmployeeDatabase(), new IllegalStateException());
+        var qdb = new QueueDatabase
+                (new DatabaseUnavailableException(), new IllegalStateException());
+        return new Commander(employeeHandle, paymentService, shippingService,
+                messagingService, qdb, numOfRetries, retryDuration,
+                queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
+    }
+
+    private Commander buildCommanderObjectNoPaymentException1() {
+        PaymentService paymentService = new PaymentService
+                (new PaymentDatabase());
+        var shippingService = new ShippingService(new ShippingDatabase());
+        var messagingService = new MessagingService(new MessagingDatabase());
+        var employeeHandle = new EmployeeHandle
+                (new EmployeeDatabase(), new IllegalStateException());
+        var qdb = new QueueDatabase
+                (new DatabaseUnavailableException(), new IllegalStateException());
+        return new Commander(employeeHandle, paymentService, shippingService,
+                messagingService, qdb, numOfRetries, retryDuration,
+                queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
+    }
+
+    private Commander buildCommanderObjectNoPaymentException2() {
+        PaymentService paymentService = new PaymentService
+                (new PaymentDatabase());
+        var shippingService = new ShippingService(new ShippingDatabase());
+        var messagingService = new MessagingService(new MessagingDatabase(), new IllegalStateException());
+        var employeeHandle = new EmployeeHandle
+                (new EmployeeDatabase(), new IllegalStateException());
+        var qdb = new QueueDatabase
+                (new DatabaseUnavailableException(), new IllegalStateException());
+        return new Commander(employeeHandle, paymentService, shippingService,
+                messagingService, qdb, numOfRetries, retryDuration,
+                queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
+    }
+
+    private Commander buildCommanderObjectNoPaymentException3() {
+        PaymentService paymentService = new PaymentService
+                (new PaymentDatabase());
+        var shippingService = new ShippingService(new ShippingDatabase());
+        var messagingService = new MessagingService(new MessagingDatabase(), new DatabaseUnavailableException());
+        var employeeHandle = new EmployeeHandle
+                (new EmployeeDatabase(), new IllegalStateException());
+        var qdb = new QueueDatabase
+                (new DatabaseUnavailableException(), new IllegalStateException());
+        return new Commander(employeeHandle, paymentService, shippingService,
+                messagingService, qdb, numOfRetries, retryDuration,
+                queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
+    }
+
+    private Commander buildCommanderObjectWithDB() {
+        return buildCommanderObjectWithoutDB(false, false, new IllegalStateException());
+    }
+
+    private Commander buildCommanderObjectWithDB(boolean includeException, boolean includeDBException, Exception e) {
+        var l = includeDBException ? new DatabaseUnavailableException() : e;
+        PaymentService paymentService;
+        ShippingService shippingService;
+        MessagingService messagingService;
+        EmployeeHandle employeeHandle;
+        if (includeException) {
+            paymentService = new PaymentService
+                    (new PaymentDatabase(), l);
+            shippingService = new ShippingService(new ShippingDatabase(), l);
+            messagingService = new MessagingService(new MessagingDatabase(), l);
+            employeeHandle = new EmployeeHandle
+                    (new EmployeeDatabase(), l);
+        } else {
+            paymentService = new PaymentService
+                    (null);
+            shippingService = new ShippingService(null);
+            messagingService = new MessagingService(null);
+            employeeHandle = new EmployeeHandle
+                    (null);
+        }
+
+
+        return new Commander(employeeHandle, paymentService, shippingService,
+                messagingService, null, numOfRetries, retryDuration,
+                queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
+    }
+
+    private Commander buildCommanderObjectWithoutDB() {
+        return buildCommanderObjectWithoutDB(false, false, new IllegalStateException());
+    }
+
+    private Commander buildCommanderObjectWithoutDB(boolean includeException, boolean includeDBException, Exception e) {
+        var l = includeDBException ? new DatabaseUnavailableException() : e;
+        PaymentService paymentService;
+        ShippingService shippingService;
+        MessagingService messagingService;
+        EmployeeHandle employeeHandle;
+        if (includeException) {
+            paymentService = new PaymentService
+                    (null, l);
+            shippingService = new ShippingService(null, l);
+            messagingService = new MessagingService(null, l);
+            employeeHandle = new EmployeeHandle
+                    (null, l);
+        } else {
+            paymentService = new PaymentService
+                    (null);
+            shippingService = new ShippingService(null);
+            messagingService = new MessagingService(null);
+            employeeHandle = new EmployeeHandle
+                    (null);
+        }
+
+
+        return new Commander(employeeHandle, paymentService, shippingService,
+                messagingService, null, numOfRetries, retryDuration,
+                queueTime, queueTaskTime, paymentTime, messageTime, employeeTime);
+    }
+
+    @Test
+    void testPlaceOrderVanilla() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            Commander c = buildCommanderObjectVanilla();
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrder() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            Commander c = buildCommanderObject(true);
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrder2() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            Commander c = buildCommanderObject(false);
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderNoException1() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            Commander c = buildCommanderObjectNoPaymentException1();
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderNoException2() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            Commander c = buildCommanderObjectNoPaymentException2();
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderNoException3() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            Commander c = buildCommanderObjectNoPaymentException3();
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderNoException4() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            Commander c = buildCommanderObjectNoPaymentException3();
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                c.placeOrder(order);
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderUnknownException() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            messageTime *= d;
+            employeeTime *= d;
+            queueTime *= d;
+            Commander c = buildCommanderObjectUnknownException();
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderShortDuration() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            messageTime *= d;
+            employeeTime *= d;
+            queueTime *= d;
+            Commander c = buildCommanderObject(true);
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderShortDuration2() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            messageTime *= d;
+            employeeTime *= d;
+            queueTime *= d;
+            Commander c = buildCommanderObject(false);
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderNoExceptionShortMsgDuration() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            messageTime *= d;
+            employeeTime *= d;
+            queueTime *= d;
+            Commander c = buildCommanderObjectNoPaymentException1();
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderNoExceptionShortQueueDuration() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            messageTime *= d;
+            employeeTime *= d;
+            queueTime *= d;
+            Commander c = buildCommanderObjectUnknownException();
+            var order = new Order(new User("K", "J"), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderWithDatabase() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            messageTime *= d;
+            employeeTime *= d;
+            queueTime *= d;
+            Commander c = buildCommanderObjectWithDB();
+            var order = new Order(new User("K", null), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderWithDatabaseAndExceptions() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            messageTime *= d;
+            employeeTime *= d;
+            queueTime *= d;
+
+            for (Exception e : exceptionList) {
+
+                Commander c = buildCommanderObjectWithDB(true, true, e);
+                var order = new Order(new User("K", null), "pen", 1f);
+                for (Order.MessageSent ms : Order.MessageSent.values()) {
+                    c.placeOrder(order);
+                    assertFalse(StringUtils.isBlank(order.id));
+                }
+
+                c = buildCommanderObjectWithDB(true, false, e);
+                order = new Order(new User("K", null), "pen", 1f);
+                for (Order.MessageSent ms : Order.MessageSent.values()) {
+                    c.placeOrder(order);
+                    assertFalse(StringUtils.isBlank(order.id));
+                }
+
+                c = buildCommanderObjectWithDB(false, false, e);
+                order = new Order(new User("K", null), "pen", 1f);
+                for (Order.MessageSent ms : Order.MessageSent.values()) {
+                    c.placeOrder(order);
+                    assertFalse(StringUtils.isBlank(order.id));
+                }
+
+                c = buildCommanderObjectWithDB(false, true, e);
+                order = new Order(new User("K", null), "pen", 1f);
+                for (Order.MessageSent ms : Order.MessageSent.values()) {
+                    c.placeOrder(order);
+                    assertFalse(StringUtils.isBlank(order.id));
+                }
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderWithoutDatabase() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            messageTime *= d;
+            employeeTime *= d;
+            queueTime *= d;
+            Commander c = buildCommanderObjectWithoutDB();
+            var order = new Order(new User("K", null), "pen", 1f);
+            for (Order.MessageSent ms : Order.MessageSent.values()) {
+                c.placeOrder(order);
+                assertFalse(StringUtils.isBlank(order.id));
+            }
+        }
+    }
+
+    @Test
+    void testPlaceOrderWithoutDatabaseAndExceptions() throws Exception {
+        for (double d = 0.1; d < 2; d = d + 0.1) {
+            paymentTime *= d;
+            queueTaskTime *= d;
+            messageTime *= d;
+            employeeTime *= d;
+            queueTime *= d;
+
+            for (Exception e : exceptionList) {
+
+                Commander c = buildCommanderObjectWithoutDB(true, true, e);
+                var order = new Order(new User("K", null), "pen", 1f);
+                for (Order.MessageSent ms : Order.MessageSent.values()) {
+                    c.placeOrder(order);
+                    assertFalse(StringUtils.isBlank(order.id));
+                }
+
+                c = buildCommanderObjectWithoutDB(true, false, e);
+                order = new Order(new User("K", null), "pen", 1f);
+                for (Order.MessageSent ms : Order.MessageSent.values()) {
+                    c.placeOrder(order);
+                    assertFalse(StringUtils.isBlank(order.id));
+                }
+
+                c = buildCommanderObjectWithoutDB(false, false, e);
+                order = new Order(new User("K", null), "pen", 1f);
+                for (Order.MessageSent ms : Order.MessageSent.values()) {
+                    c.placeOrder(order);
+                    assertFalse(StringUtils.isBlank(order.id));
+                }
+
+                c = buildCommanderObjectWithoutDB(false, true, e);
+                order = new Order(new User("K", null), "pen", 1f);
+                for (Order.MessageSent ms : Order.MessageSent.values()) {
+                    c.placeOrder(order);
+                    assertFalse(StringUtils.isBlank(order.id));
+                }
+            }
+        }
+    }
+
+}

composite-entity/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>composite-entity</artifactId>

composite-view/README.md

@@ -0,0 +1,325 @@
+---
+layout: pattern
+title: Composite View 
+folder: composite-view
+permalink: /patterns/composite-view/
+categories: Structural
+language: en
+tags:
+- Enterprise Integration Pattern
+- Presentation
+---
+
+## Name
+**Composite View**
+
+## Intent
+The purpose of the Composite View Pattern is to increase re-usability and flexibility when creating views for websites/webapps. 
+This pattern seeks to decouple the content of the page from its layout, allowing changes to be made to either the content
+or layout of the page without impacting the other. This pattern also allows content to be easily reused across different views easily.
+
+## Explanation
+Real World Example
+> A news site wants to display the current date and news to different users
+> based on that user's preferences. The news site will substitute in different news feed
+> components depending on the user's interest, defaulting to local news.
+
+In Plain Words
+> Composite View Pattern is having a main view being composed of smaller subviews.
+> The layout of this composite view is based on a template. A View-manager then decides which
+> subviews to include in this template.
+
+Wikipedia Says
+> Composite views that are composed of multiple atomic subviews. Each component of 
+> the template may be included dynamically into the whole and the layout of the page may be managed independently of the content.
+> This solution provides for the creation of a composite view based on the inclusion and substitution of 
+> modular dynamic and static template fragments. 
+> It promotes the reuse of atomic portions of the view by encouraging modular design.
+
+**Programmatic Example**
+
+Since this is a web development pattern, a server is required to demonstrate it.
+This example uses Tomcat 10.0.13 to run the servlet, and this programmatic example will only work with Tomcat 10+.
+
+Firstly there is `AppServlet` which is an `HttpServlet` that runs on Tomcat 10+.
+```java
+public class AppServlet extends HttpServlet {
+  private String msgPartOne = "<h1>This Server Doesn't Support";
+  private String msgPartTwo = "Requests</h1>\n"
+      + "<h2>Use a GET request with boolean values for the following parameters<h2>\n"
+      + "<h3>'name'</h3>\n<h3>'bus'</h3>\n<h3>'sports'</h3>\n<h3>'sci'</h3>\n<h3>'world'</h3>";
+
+  private String destination = "newsDisplay.jsp";
+
+  public AppServlet() {
+
+  }
+
+  @Override
+  public void doGet(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    RequestDispatcher requestDispatcher = req.getRequestDispatcher(destination);
+    ClientPropertiesBean reqParams = new ClientPropertiesBean(req);
+    req.setAttribute("properties", reqParams);
+    requestDispatcher.forward(req, resp);
+  }
+
+  @Override
+  public void doPost(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    resp.setContentType("text/html");
+    PrintWriter out = resp.getWriter();
+    out.println(msgPartOne + " Post " + msgPartTwo);
+
+  }
+
+  @Override
+  public void doDelete(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    resp.setContentType("text/html");
+    PrintWriter out = resp.getWriter();
+    out.println(msgPartOne + " Delete " + msgPartTwo);
+
+  }
+
+  @Override
+  public void doPut(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    resp.setContentType("text/html");
+    PrintWriter out = resp.getWriter();
+    out.println(msgPartOne + " Put " + msgPartTwo);
+
+  }
+}
+
+```
+This servlet is not part of the pattern, and simply forwards GET requests to the correct JSP.
+PUT, POST, and DELETE requests are not supported and will simply show an error message.
+
+The view management in this example is done via a javabean class: `ClientPropertiesBean`, which stores user preferences.
+```java
+public class ClientPropertiesBean implements Serializable {
+
+  private static final String WORLD_PARAM = "world";
+  private static final String SCIENCE_PARAM = "sci";
+  private static final String SPORTS_PARAM = "sport";
+  private static final String BUSINESS_PARAM = "bus";
+  private static final String NAME_PARAM = "name";
+
+  private static final String DEFAULT_NAME = "DEFAULT_NAME";
+  private boolean worldNewsInterest;
+  private boolean sportsInterest;
+  private boolean businessInterest;
+  private boolean scienceNewsInterest;
+  private String name;
+  
+  public ClientPropertiesBean() {
+    worldNewsInterest = true;
+    sportsInterest = true;
+    businessInterest = true;
+    scienceNewsInterest = true;
+    name = DEFAULT_NAME;
+
+  }
+  
+  public ClientPropertiesBean(HttpServletRequest req) {
+    worldNewsInterest = Boolean.parseBoolean(req.getParameter(WORLD_PARAM));
+    sportsInterest = Boolean.parseBoolean(req.getParameter(SPORTS_PARAM));
+    businessInterest = Boolean.parseBoolean(req.getParameter(BUSINESS_PARAM));
+    scienceNewsInterest = Boolean.parseBoolean(req.getParameter(SCIENCE_PARAM));
+    String tempName = req.getParameter(NAME_PARAM);
+    if (tempName == null || tempName == "") {
+      tempName = DEFAULT_NAME;
+    }
+    name = tempName;
+  }
+  // getters and setters generated by Lombok 
+}
+```
+This javabean has a default constructor, and another that takes an `HttpServletRequest`.
+This second constructor takes the request object, parses out the request parameters which contain the
+user preferences for different types of news.
+
+The template for the news page is in `newsDisplay.jsp`
+```html
+<html>
+<head>
+    <style>
+        h1 { text-align: center;}
+        h2 { text-align: center;}
+        h3 { text-align: center;}
+        .centerTable {
+            margin-left: auto;
+            margin-right: auto;
+        }
+        table {border: 1px solid black;}
+        tr {text-align: center;}
+        td {text-align: center;}
+    </style>
+</head>
+<body>
+    <%ClientPropertiesBean propertiesBean = (ClientPropertiesBean) request.getAttribute("properties");%>
+    <h1>Welcome <%= propertiesBean.getName()%></h1>
+    <jsp:include page="header.jsp"></jsp:include>
+    <table class="centerTable">
+
+        <tr>
+            <td></td>
+            <% if(propertiesBean.isWorldNewsInterest()) { %>
+                <td><%@include file="worldNews.jsp"%></td>
+            <% } else { %>
+                <td><%@include file="localNews.jsp"%></td>
+            <% } %>
+            <td></td>
+        </tr>
+        <tr>
+            <% if(propertiesBean.isBusinessInterest()) { %>
+                <td><%@include file="businessNews.jsp"%></td>
+            <% } else { %>
+                <td><%@include file="localNews.jsp"%></td>
+            <% } %>
+            <td></td>
+            <% if(propertiesBean.isSportsInterest()) { %>
+                <td><%@include file="sportsNews.jsp"%></td>
+            <% } else { %>
+                <td><%@include file="localNews.jsp"%></td>
+            <% } %>
+        </tr>
+        <tr>
+            <td></td>
+            <% if(propertiesBean.isScienceNewsInterest()) { %>
+                <td><%@include file="scienceNews.jsp"%></td>
+            <% } else { %>
+                <td><%@include file="localNews.jsp"%></td>
+            <% } %>
+            <td></td>
+        </tr>
+    </table>
+</body>
+</html>
+```
+This JSP page is the template. It declares a table with three rows, with one component in the first row,
+two components in the second row, and one component in the third row. 
+
+The scriplets in the file are part of the
+view management strategy that include different atomic subviews based on the user preferences in the Javabean.
+
+Here are two examples of the mock atomic subviews used in the composite:
+`businessNews.jsp`
+```html
+<html>
+    <head>
+        <style>
+            h2 { text-align: center;}
+            table {border: 1px solid black;}
+            tr {text-align: center;}
+            td {text-align: center;}
+        </style>
+    </head>
+    <body>
+        <h2>
+            Generic Business News
+        </h2>
+        <table style="margin-right: auto; margin-left: auto">
+            <tr>
+                <td>Stock prices up across the world</td>
+                <td>New tech companies to invest in</td>
+            </tr>
+            <tr>
+                <td>Industry leaders unveil new project</td>
+                <td>Price fluctuations and what they mean</td>
+            </tr>
+        </table>
+    </body>
+</html>
+```
+`localNews.jsp`
+```html
+<html>
+    <body>
+        <div style="text-align: center">
+            <h3>
+                Generic Local News
+            </h3>
+            <ul style="list-style-type: none">
+                <li>
+                    Mayoral elections coming up in 2 weeks
+                </li>
+                <li>
+                    New parking meter rates downtown coming tomorrow
+                </li>
+                <li>
+                    Park renovations to finish by the next year
+                </li>
+                <li>
+                    Annual marathon sign ups available online
+                </li>
+            </ul>
+        </div>
+    </body>
+</html>
+```
+The results are as such:
+
+1) The user has put their name as `Tammy` in the request parameters and no preferences: 
+![alt text](etc/images/noparam.PNG)
+2) The user has put their name as `Johnny` in the request parameters and has a preference for world, business, and science news:
+![alt text](etc/images/threeparams.PNG)
+
+The different subviews such as `worldNews.jsp`, `businessNews.jsp`, etc. are included conditionally
+based on the request parameters.
+
+**How To Use**
+
+To try this example, make sure you have Tomcat 10+ installed.
+Set up your IDE to build a WAR file from the module and deploy that file to the server
+
+IntelliJ:
+
+Under `Run` and `edit configurations` Make sure Tomcat server is one of the run configurations. 
+Go to the deployment tab, and make sure there is one artifact being built called `composite-view:war exploded`. 
+If not present, add one.
+
+Ensure that the artifact is being built from the content of the `web` directory and the compilation results of the module.
+Point the output of the artifact to a convenient place. Run the configuration and view the landing page, 
+follow instructions on that page to continue.
+
+## Class diagram
+
+![alt text](./etc/composite_view.png)
+
+The class diagram here displays the Javabean which is the view manager.
+The views are JSP's held inside the web directory.
+
+## Applicability
+
+This pattern is applicable to most websites that require content to be displayed dynamically/conditionally.
+If there are components that need to be re-used for multiple views, or if the project requires reusing a template, 
+or if it needs to include content depending on certain conditions, then this pattern is a good choice.
+
+## Known uses
+
+Most modern websites use composite views in some shape or form, as they have templates for views and small atomic components
+that are included in the page dynamically. Most modern Javascript libraries, like React, support this design pattern 
+with components.
+
+## Consequences
+**Pros**
+* Easy to re-use components
+* Change layout/content without affecting the other
+* Reduce code duplication
+* Code is more maintainable and modular
+
+**Cons**
+* Overhead cost at runtime
+* Slower response compared to directly embedding elements
+* Increases potential for display errors 
+
+## Related patterns
+* [Composite (GoF)](https://java-design-patterns.com/patterns/composite/)
+* [View Helper](https://www.oracle.com/java/technologies/viewhelper.html)
+
+## Credits
+* [Core J2EE Patterns - Composite View](https://www.oracle.com/java/technologies/composite-view.html)
+* [Composite View Design Pattern – Core J2EE Patterns](https://www.dineshonjava.com/composite-view-design-pattern/)
+

composite-view/etc/composite-view.urm.puml

@@ -0,0 +1,29 @@
+@startuml
+package com.iluwatar.compositeview {
+  class ClientPropertiesBean {
+    - BUSINESS_PARAM : String {static}
+    - DEFAULT_NAME : String {static}
+    - NAME_PARAM : String {static}
+    - SCIENCE_PARAM : String {static}
+    - SPORTS_PARAM : String {static}
+    - WORLD_PARAM : String {static}
+    - businessInterest : boolean
+    - name : String
+    - scienceNewsInterest : boolean
+    - sportsInterest : boolean
+    - worldNewsInterest : boolean
+    + ClientPropertiesBean()
+    + ClientPropertiesBean(req : HttpServletRequest)
+    + getName() : String
+    + isBusinessInterest() : boolean
+    + isScienceNewsInterest() : boolean
+    + isSportsInterest() : boolean
+    + isWorldNewsInterest() : boolean
+    + setBusinessInterest(businessInterest : boolean)
+    + setName(name : String)
+    + setScienceNewsInterest(scienceNewsInterest : boolean)
+    + setSportsInterest(sportsInterest : boolean)
+    + setWorldNewsInterest(worldNewsInterest : boolean)
+  }
+}
+@enduml

composite-view/pom.xml

@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    The MIT License
+    Copyright © 2014-2021 Ilkka Seppälä
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-design-patterns</artifactId>
+        <groupId>com.iluwatar</groupId>
+        <version>1.26.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>composite-view</artifactId>
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.servlet</groupId>
+            <artifactId>jakarta.servlet-api</artifactId>
+            <version>5.0.0</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>4.1.0</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <configuration>
+                            <archive>
+                                <manifest>
+                                    <mainClass>com.iluwatar.compositeview.App</mainClass>
+                                </manifest>
+                            </archive>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

composite-view/src/main/java/com/iluwatar/compositeview/AppServlet.java

@@ -0,0 +1,64 @@
+package com.iluwatar.compositeview;
+
+import jakarta.servlet.RequestDispatcher;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+/**
+ * A servlet object that extends HttpServlet.
+ * Runs on Tomcat 10 and handles Http requests
+ */
+
+public final class AppServlet extends HttpServlet {
+  private String msgPartOne = "<h1>This Server Doesn't Support";
+  private String msgPartTwo = "Requests</h1>\n"
+      + "<h2>Use a GET request with boolean values for the following parameters<h2>\n"
+      + "<h3>'name'</h3>\n<h3>'bus'</h3>\n<h3>'sports'</h3>\n<h3>'sci'</h3>\n<h3>'world'</h3>";
+
+  private String destination = "newsDisplay.jsp";
+
+  public AppServlet() {
+
+  }
+
+  @Override
+  public void doGet(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    RequestDispatcher requestDispatcher = req.getRequestDispatcher(destination);
+    ClientPropertiesBean reqParams = new ClientPropertiesBean(req);
+    req.setAttribute("properties", reqParams);
+    requestDispatcher.forward(req, resp);
+  }
+
+  @Override
+  public void doPost(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    resp.setContentType("text/html");
+    try (PrintWriter out = resp.getWriter()) {
+      out.println(msgPartOne + " Post " + msgPartTwo);
+    }
+
+  }
+
+  @Override
+  public void doDelete(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    resp.setContentType("text/html");
+    try (PrintWriter out = resp.getWriter()) {
+      out.println(msgPartOne + " Delete " + msgPartTwo);
+    }
+  }
+
+  @Override
+  public void doPut(HttpServletRequest req, HttpServletResponse resp)
+          throws ServletException, IOException {
+    resp.setContentType("text/html");
+    try (PrintWriter out = resp.getWriter()) {
+      out.println(msgPartOne + " Put " + msgPartTwo);
+    }
+  }
+}

composite-view/src/main/java/com/iluwatar/compositeview/ClientPropertiesBean.java

@@ -0,0 +1,53 @@
+package com.iluwatar.compositeview;
+
+import jakarta.servlet.http.HttpServletRequest;
+import java.io.Serializable;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+
+/**
+ * A Java beans class that parses a http request and stores parameters.
+ * Java beans used in JSP's to dynamically include elements in view.
+ * DEFAULT_NAME = a constant, default name to be used for the default constructor
+ * worldNewsInterest = whether current request has world news interest
+ * sportsInterest = whether current request has a sportsInterest
+ * businessInterest = whether current request has a businessInterest
+ * scienceNewsInterest = whether current request has a scienceNewsInterest
+ */
+@Getter
+@Setter
+@NoArgsConstructor
+public class ClientPropertiesBean implements Serializable {
+
+  private static final String WORLD_PARAM = "world";
+  private static final String SCIENCE_PARAM = "sci";
+  private static final String SPORTS_PARAM = "sport";
+  private static final String BUSINESS_PARAM = "bus";
+  private static final String NAME_PARAM = "name";
+
+  private static final  String DEFAULT_NAME = "DEFAULT_NAME";
+  private boolean worldNewsInterest = true;
+  private boolean sportsInterest = true;
+  private boolean businessInterest = true;
+  private boolean scienceNewsInterest = true;
+  private String name = DEFAULT_NAME;
+
+  /**
+   * Constructor that parses an HttpServletRequest and stores all the request parameters.
+   *
+   * @param req the HttpServletRequest object that is passed in
+   */
+  public ClientPropertiesBean(HttpServletRequest req) {
+    worldNewsInterest = Boolean.parseBoolean(req.getParameter(WORLD_PARAM));
+    sportsInterest = Boolean.parseBoolean(req.getParameter(SPORTS_PARAM));
+    businessInterest = Boolean.parseBoolean(req.getParameter(BUSINESS_PARAM));
+    scienceNewsInterest = Boolean.parseBoolean(req.getParameter(SCIENCE_PARAM));
+    String tempName = req.getParameter(NAME_PARAM);
+    if (tempName == null || tempName.equals("")) {
+      tempName = DEFAULT_NAME;
+    }
+    name = tempName;
+  }
+}

composite-view/src/test/java/com/iluwatar/compositeview/AppServletTest.java

@@ -0,0 +1,83 @@
+package com.iluwatar.compositeview;
+
+import jakarta.servlet.RequestDispatcher;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import static org.junit.Assert.*;
+
+/* Written with reference from https://stackoverflow.com/questions/5434419/how-to-test-my-servlet-using-junit
+and https://stackoverflow.com/questions/50211433/servlets-unit-testing
+ */
+
+public class AppServletTest extends Mockito{
+  private String msgPartOne = "<h1>This Server Doesn't Support";
+  private String msgPartTwo = "Requests</h1>\n"
+      + "<h2>Use a GET request with boolean values for the following parameters<h2>\n"
+      + "<h3>'name'</h3>\n<h3>'bus'</h3>\n<h3>'sports'</h3>\n<h3>'sci'</h3>\n<h3>'world'</h3>";
+  private String destination = "newsDisplay.jsp";
+
+  @Test
+  public void testDoGet() throws Exception {
+    HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse mockResp = Mockito.mock(HttpServletResponse.class);
+    RequestDispatcher mockDispatcher = Mockito.mock(RequestDispatcher.class);
+    StringWriter stringWriter = new StringWriter();
+    PrintWriter printWriter = new PrintWriter(stringWriter);
+    when(mockResp.getWriter()).thenReturn(printWriter);
+    when(mockReq.getRequestDispatcher(destination)).thenReturn(mockDispatcher);
+    AppServlet curServlet = new AppServlet();
+    curServlet.doGet(mockReq, mockResp);
+    verify(mockReq, times(1)).getRequestDispatcher(destination);
+    verify(mockDispatcher).forward(mockReq, mockResp);
+
+
+  }
+
+  @Test
+  public void testDoPost() throws Exception {
+    HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse mockResp = Mockito.mock(HttpServletResponse.class);
+    StringWriter stringWriter = new StringWriter();
+    PrintWriter printWriter = new PrintWriter(stringWriter);
+    when(mockResp.getWriter()).thenReturn(printWriter);
+
+    AppServlet curServlet = new AppServlet();
+    curServlet.doPost(mockReq, mockResp);
+    printWriter.flush();
+    assertTrue(stringWriter.toString().contains(msgPartOne + " Post " + msgPartTwo));
+  }
+
+  @Test
+  public void testDoPut() throws Exception {
+    HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse mockResp = Mockito.mock(HttpServletResponse.class);
+    StringWriter stringWriter = new StringWriter();
+    PrintWriter printWriter = new PrintWriter(stringWriter);
+    when(mockResp.getWriter()).thenReturn(printWriter);
+
+    AppServlet curServlet = new AppServlet();
+    curServlet.doPut(mockReq, mockResp);
+    printWriter.flush();
+    assertTrue(stringWriter.toString().contains(msgPartOne + " Put " + msgPartTwo));
+  }
+
+  @Test
+  public void testDoDelete() throws Exception {
+    HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse mockResp = Mockito.mock(HttpServletResponse.class);
+    StringWriter stringWriter = new StringWriter();
+    PrintWriter printWriter = new PrintWriter(stringWriter);
+    when(mockResp.getWriter()).thenReturn(printWriter);
+
+    AppServlet curServlet = new AppServlet();
+    curServlet.doDelete(mockReq, mockResp);
+    printWriter.flush();
+    assertTrue(stringWriter.toString().contains(msgPartOne + " Delete " + msgPartTwo));
+  }
+}

composite-view/src/test/java/com/iluwatar/compositeview/JavaBeansTest.java

@@ -0,0 +1,71 @@
+package com.iluwatar.compositeview;
+
+import jakarta.servlet.http.HttpServletRequest;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import static org.junit.Assert.*;
+
+public class JavaBeansTest {
+    @Test
+    public void testDefaultConstructor() {
+        ClientPropertiesBean newBean = new ClientPropertiesBean();
+        assertEquals("DEFAULT_NAME", newBean.getName());
+        assertTrue(newBean.isBusinessInterest());
+        assertTrue(newBean.isScienceNewsInterest());
+        assertTrue(newBean.isSportsInterest());
+        assertTrue(newBean.isWorldNewsInterest());
+
+    }
+
+    @Test
+    public void testNameGetterSetter() {
+        ClientPropertiesBean newBean = new ClientPropertiesBean();
+        assertEquals("DEFAULT_NAME", newBean.getName());
+        newBean.setName("TEST_NAME_ONE");
+        assertEquals("TEST_NAME_ONE", newBean.getName());
+    }
+
+    @Test
+    public void testBusinessSetterGetter() {
+        ClientPropertiesBean newBean = new ClientPropertiesBean();
+        assertTrue(newBean.isBusinessInterest());
+        newBean.setBusinessInterest(false);
+        assertFalse(newBean.isBusinessInterest());
+    }
+
+    @Test
+    public void testScienceSetterGetter() {
+        ClientPropertiesBean newBean = new ClientPropertiesBean();
+        assertTrue(newBean.isScienceNewsInterest());
+        newBean.setScienceNewsInterest(false);
+        assertFalse(newBean.isScienceNewsInterest());
+    }
+
+    @Test
+    public void testSportsSetterGetter() {
+        ClientPropertiesBean newBean = new ClientPropertiesBean();
+        assertTrue(newBean.isSportsInterest());
+        newBean.setSportsInterest(false);
+        assertFalse(newBean.isSportsInterest());
+    }
+
+    @Test
+    public void testWorldSetterGetter() {
+        ClientPropertiesBean newBean = new ClientPropertiesBean();
+        assertTrue(newBean.isWorldNewsInterest());
+        newBean.setWorldNewsInterest(false);
+        assertFalse(newBean.isWorldNewsInterest());
+    }
+
+    @Test
+    public void testRequestConstructor(){
+        HttpServletRequest mockReq = Mockito.mock(HttpServletRequest.class);
+        ClientPropertiesBean newBean = new ClientPropertiesBean((mockReq));
+        assertEquals("DEFAULT_NAME", newBean.getName());
+        assertFalse(newBean.isWorldNewsInterest());
+        assertFalse(newBean.isBusinessInterest());
+        assertFalse(newBean.isScienceNewsInterest());
+        assertFalse(newBean.isSportsInterest());
+    }
+}

composite-view/web/WEB-INF/web.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
+         version="4.0">
+    <servlet>
+        <servlet-name>appServlet</servlet-name>
+        <servlet-class>com.iluwatar.compositeview.AppServlet</servlet-class>
+    </servlet>
+    <servlet-mapping>
+        <servlet-name>appServlet</servlet-name>
+        <url-pattern>/news</url-pattern>
+    </servlet-mapping>
+</web-app>

composite-view/web/businessNews.jsp

@@ -0,0 +1,33 @@
+<%--
+  Created by IntelliJ IDEA.
+  User: Kevin
+  Date: 11/29/2021
+  Time: 2:51 PM
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+    <head>
+        <style>
+            h2 { text-align: center;}
+            table {border: 1px solid black;}
+            tr {text-align: center;}
+            td {text-align: center;}
+        </style>
+    </head>
+    <body>
+        <h2>
+            Generic Business News
+        </h2>
+        <table style="margin-right: auto; margin-left: auto">
+            <tr>
+                <td>Stock prices up across the world</td>
+                <td>New tech companies to invest in</td>
+            </tr>
+            <tr>
+                <td>Industry leaders unveil new project</td>
+                <td>Price fluctuations and what they mean</td>
+            </tr>
+        </table>
+    </body>
+</html>

composite-view/web/header.jsp

@@ -0,0 +1,23 @@
+<%--
+  Created by IntelliJ IDEA.
+  User: Kevin
+  Date: 11/29/2021
+  Time: 1:28 PM
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<%@ page import="java.util.Date"%>
+<html>
+<head>
+    <style>
+        h1 { text-align: center;}
+        h2 { text-align: center;}
+        h3 { text-align: center;}
+    </style>
+</head>
+<body>
+    <% String todayDateStr = (new Date().toString()); %>
+    <h1>Today's Personalized Frontpage</h1>
+    <h2><%=todayDateStr%></h2>
+</body>
+</html>

composite-view/web/index.jsp

@@ -0,0 +1,20 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+  <head>
+    <style>
+      h1 { text-align: center;}
+      h2 { text-align: center;}
+      h3 { text-align: center;}
+    </style>
+  </head>
+  <body>
+    <h1>Welcome To The Composite Patterns Mock News Site</h1>
+    <h2>Send a GET request to the "/news" path to see the composite view with mock news</h2>
+    <h2>Use the following parameters:</h2>
+    <h3>name: string name to be dynamically displayed</h3>
+    <h3>bus: boolean for whether you want to see the mock business news</h3>
+    <h3>world: boolean for whether you want to see the mock world news</h3>
+    <h3>sci: boolean for whether you want to see the mock world news</h3>
+    <h3>sport: boolean for whether you want to see the mock world news</h3>
+  </body>
+</html>

composite-view/web/localNews.jsp

@@ -0,0 +1,25 @@
+
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+    <body>
+        <div style="text-align: center">
+            <h3>
+                Generic Local News
+            </h3>
+            <ul style="list-style-type: none">
+                <li>
+                    Mayoral elections coming up in 2 weeks
+                </li>
+                <li>
+                    New parking meter rates downtown coming tomorrow
+                </li>
+                <li>
+                    Park renovations to finish by the next year
+                </li>
+                <li>
+                    Annual marathon sign ups available online
+                </li>
+            </ul>
+        </div>
+    </body>
+</html>

composite-view/web/newsDisplay.jsp

@@ -0,0 +1,57 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<%@ page import="com.iluwatar.compositeview.ClientPropertiesBean"%>
+<html>
+<head>
+    <style>
+        h1 { text-align: center;}
+        h2 { text-align: center;}
+        h3 { text-align: center;}
+        .centerTable {
+            margin-left: auto;
+            margin-right: auto;
+        }
+        table {border: 1px solid black;}
+        tr {text-align: center;}
+        td {text-align: center;}
+    </style>
+</head>
+<body>
+    <%ClientPropertiesBean propertiesBean = (ClientPropertiesBean) request.getAttribute("properties");%>
+    <h1>Welcome <%= propertiesBean.getName()%></h1>
+    <jsp:include page="header.jsp"></jsp:include>
+    <table class="centerTable">
+
+        <tr>
+            <td></td>
+            <% if(propertiesBean.isWorldNewsInterest()) { %>
+                <td><%@include file="worldNews.jsp"%></td>
+            <% } else { %>
+                <td><%@include file="localNews.jsp"%></td>
+            <% } %>
+            <td></td>
+        </tr>
+        <tr>
+            <% if(propertiesBean.isBusinessInterest()) { %>
+                <td><%@include file="businessNews.jsp"%></td>
+            <% } else { %>
+                <td><%@include file="localNews.jsp"%></td>
+            <% } %>
+            <td></td>
+            <% if(propertiesBean.isSportsInterest()) { %>
+                <td><%@include file="sportsNews.jsp"%></td>
+            <% } else { %>
+                <td><%@include file="localNews.jsp"%></td>
+            <% } %>
+        </tr>
+        <tr>
+            <td></td>
+            <% if(propertiesBean.isScienceNewsInterest()) { %>
+                <td><%@include file="scienceNews.jsp"%></td>
+            <% } else { %>
+                <td><%@include file="localNews.jsp"%></td>
+            <% } %>
+            <td></td>
+        </tr>
+    </table>
+</body>
+</html>

composite-view/web/scienceNews.jsp

@@ -0,0 +1,34 @@
+<%--
+  Created by IntelliJ IDEA.
+  User: Kevin
+  Date: 11/29/2021
+  Time: 4:18 PM
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+    <body>
+        <div style="text-align: center">
+            <h3>
+                Generic Science News
+            </h3>
+            <ul>
+                <li>
+                    New model of gravity proposed for dark matter
+                </li>
+                <li>
+                    Genetic modifying technique proved on bacteria
+                </li>
+                <li>
+                    Neurology study maps brain with new precision
+                </li>
+                <li>
+                    Survey of rainforest discovers 15 new species
+                </li>
+                <li>
+                    New signalling pathway for immune system discovered
+                </li>
+            </ul>
+        </div>
+    </body>
+</html>

composite-view/web/sportsNews.jsp

@@ -0,0 +1,32 @@
+<%--
+  Created by IntelliJ IDEA.
+  User: Kevin
+  Date: 11/29/2021
+  Time: 3:53 PM
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+  <head>
+    <style>
+      h2 { text-align: center;}
+      table {border: 1px solid black;}
+      tr {text-align: center;}
+      td {text-align: center;}
+    </style>
+  </head>
+  <body>
+    <h2>
+      Generic Sports News
+    </h2>
+    <div style="margin-left: auto; margin-right: auto; padding: 20px">
+      International football match delayed due to weather, will be held next week
+    </div>
+    <div style="margin-left: auto; margin-right: auto; padding: 20px">
+      New rising stars in winter sports, ten new athletes that will shake up the scene
+    </div>
+    <div style="margin-left: auto; margin-right: auto; padding: 20px">
+      Biggest upset in basketball history, upstart team sweeps competition
+    </div>
+  </body>
+</html>

composite-view/web/worldNews.jsp

@@ -0,0 +1,34 @@
+<%--
+  Created by IntelliJ IDEA.
+  User: Kevin
+  Date: 11/29/2021
+  Time: 2:51 PM
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <style>
+        h2 { text-align: center;}
+        table {border: 1px solid black;}
+        tr {text-align: center;}
+        td {text-align: center;}
+    </style>
+</head>
+<body>
+    <h2>
+        Generic World News
+    </h2>
+    <table style="margin-right: auto; margin-left: auto">
+        <tr>
+            <td>New trade talks happening at UN on Thursday</td>
+        </tr>
+        <tr>
+            <td>European Union to announce new resolution next week</td>
+        </tr>
+        <tr>
+            <td>UN delivers report on world economic status</td>
+        </tr>
+    </table>
+</body>
+</html>

composite/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>composite</artifactId>
   <dependencies>

converter/pom.xml

@@ -27,7 +27,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>converter</artifactId>
   <modelVersion>4.0.0</modelVersion>

cqrs/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>cqrs</artifactId>
   <dependencies>

dao/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>dao</artifactId>
   <dependencies>

data-bus/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>data-bus</artifactId>
   <dependencies>

data-locality/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>data-locality</artifactId>
   <dependencies>

data-mapper/pom.xml

@@ -28,7 +28,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.25.0-SNAPSHOT</version>
+    <version>1.26.0-SNAPSHOT</version>
   </parent>
   <artifactId>data-mapper</artifactId>
   <dependencies>