docs: update .all-contributorsrc [skip ci]

.all-contributorsrc

@@ -1604,33 +1604,6 @@
       "contributions": [
         "code"
       ]
-    },
-    {
-      "login": "Conhan93",
-      "name": "Conny Hansson",
-      "avatar_url": "https://avatars.githubusercontent.com/u/71334757?v=4",
-      "profile": "https://github.com/Conhan93",
-      "contributions": [
-        "doc"
-      ]
-    },
-    {
-      "login": "muklasr",
-      "name": "Muklas Rahmanto",
-      "avatar_url": "https://avatars.githubusercontent.com/u/43443753?v=4",
-      "profile": "http://muklasr.medium.com",
-      "contributions": [
-        "translation"
-      ]
-    },
-    {
-      "login": "VxDxK",
-      "name": "Vadim",
-      "avatar_url": "https://avatars.githubusercontent.com/u/38704817?v=4",
-      "profile": "https://github.com/VxDxK",
-      "contributions": [
-        "translation"
-      ]
     }
   ],
   "contributorsPerLine": 4,

README.md

@@ -10,12 +10,12 @@
 [![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-179-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-176-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 <br/>
 
-Read in different language : [**zh**](localization/zh/README.md), [**ko**](localization/ko/README.md), [**fr**](localization/fr/README.md), [**tr**](localization/tr/README.md), [**ar**](localization/ar/README.md), [**es**](localization/es/README.md), [**pt**](localization/pt/README.md), [**id**](localization/id/README.md), [**ru**](localization/ru/README.md) 
+Read in different language : [**zh**](localization/zh/README.md), [**ko**](localization/ko/README.md), [**fr**](localization/fr/README.md), [**tr**](localization/tr/README.md), [**ar**](localization/ar/README.md), [**es**](localization/es/README.md), [**pt**](localization/pt/README.md)
 
 <br/>
 
@@ -339,11 +339,6 @@ This project is licensed under the terms of the MIT license.
     <td align="center"><a href="https://stackoverflow.com/users/308565/nagaraj-tantri"><img src="https://avatars.githubusercontent.com/u/3784194?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Nagaraj Tantri</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=tan31989" title="Code">💻</a></td>
     <td align="center"><a href="http://scuccimarri.it"><img src="https://avatars.githubusercontent.com/u/7107651?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Francesco Scuccimarri</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=frascu" title="Code">💻</a></td>
   </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/Conhan93"><img src="https://avatars.githubusercontent.com/u/71334757?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Conny Hansson</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Conhan93" title="Documentation">📖</a></td>
-    <td align="center"><a href="http://muklasr.medium.com"><img src="https://avatars.githubusercontent.com/u/43443753?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Muklas Rahmanto</b></sub></a><br /><a href="#translation-muklasr" title="Translation">🌍</a></td>
-    <td align="center"><a href="https://github.com/VxDxK"><img src="https://avatars.githubusercontent.com/u/38704817?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Vadim</b></sub></a><br /><a href="#translation-VxDxK" title="Translation">🌍</a></td>
-  </tr>
 </table>
 
 <!-- markdownlint-restore -->

abstract-document/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Abstract Document
-category: Structural
+folder: abstract-document
+permalink: /patterns/abstract-document/
+categories: Structural
 language: en
 tags: 
  - Extensibility

abstract-factory/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Abstract Factory
-category: Creational
+folder: abstract-factory
+permalink: /patterns/abstract-factory/
+categories: Creational
 language: en
 tags:
  - Gang of Four

active-object/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Active Object
-category: Concurrency
+folder: active-object
+permalink: /patterns/active-object/
+categories: Concurrency
 language: en
 tags:
  - Performance
@@ -8,7 +11,7 @@ tags:
 
 
 ## Intent
-The active object design pattern decouples method execution from method invocation for objects that each reside in their thread of control. The goal is to introduce concurrency, by using asynchronous method invocation, and a scheduler for handling requests.
+The active object design pattern decouples method execution from method invocation for objects that each reside in their thread of control. The goal is to introduce concurrency, by using asynchronous method invocation and a scheduler for handling requests.
 
 ## Explanation
 
@@ -67,7 +70,7 @@ public abstract class ActiveCreature{
     requests.put(new Runnable() {
         @Override
         public void run() { 
-          logger.info("{} has started to roam the wastelands.",name());
+          logger.info("{} has started to roam and the wastelands.",name());
         }
       }
     );
@@ -79,7 +82,7 @@ public abstract class ActiveCreature{
 }
 ```
 
-We can see that any class that will extend the ActiveCreature class will have its own thread of control to invoke and execute methods.
+We can see that any class that will extend the ActiveCreature class will have its own thread of control to execute and invocate methods.
 
 For example, the Orc class:
 
@@ -93,7 +96,7 @@ public class Orc extends ActiveCreature {
 }
 ```
 
-Now, we can create multiple creatures such as Orcs, tell them to eat and roam, and they will execute it on their own thread of control:
+Now, we can create multiple creatures such as Orcs, tell them to eat and roam and they will execute it on their own thread of control:
 
 ```java
   public static void main(String[] args) {  

active-object/src/main/java/com/iluwatar/activeobject/ActiveCreature.java

@@ -82,7 +82,7 @@ public abstract class ActiveCreature {
   }
 
   /**
-   * Roam the wastelands.
+   * Roam in the wastelands.
    * @throws InterruptedException due to firing a new Runnable.
    */
   public void roam() throws InterruptedException {

acyclic-visitor/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Acyclic Visitor
-category: Behavioral
+folder: acyclic-visitor
+permalink: /patterns/acyclic-visitor/
+categories: Behavioral
 language: en
 tags:
  - Extensibility

adapter/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Adapter
-category: Structural
+folder: adapter
+permalink: /patterns/adapter/
+categories: Structural
 language: en
 tags:
  - Gang of Four

aggregator-microservices/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Aggregator Microservices
-category: Architectural
+folder: aggregator-microservices
+permalink: /patterns/aggregator-microservices/
+categories: Architectural
 language: en
 tags:
 - Cloud distributed

ambassador/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Ambassador
-category: Structural
+folder: ambassador
+permalink: /patterns/ambassador/
+categories: Structural
 language: en
 tags:
   - Decoupling

api-gateway/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: API Gateway
-category: Architectural
+folder: api-gateway
+permalink: /patterns/api-gateway/
+categories: Architectural
 language: en
 tags:
   - Cloud distributed

arrange-act-assert/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Arrange/Act/Assert
-category: Idiom
+folder: arrange-act-assert
+permalink: /patterns/arrange-act-assert/
+categories: Idiom
 language: en
 tags:
  - Testing

async-method-invocation/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Async Method Invocation
-category: Concurrency
+folder: async-method-invocation
+permalink: /patterns/async-method-invocation/
+categories: Concurrency
 language: en
 tags:
  - Reactive

balking/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Balking
-category: Concurrency
+folder: balking
+permalink: /patterns/balking/
+categories: Concurrency
 language: en
 tags:
  - Decoupling

bridge/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Bridge
-category: Structural
+folder: bridge
+permalink: /patterns/bridge/
+categories: Structural
 language: en
 tags:
  - Gang of Four

builder/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Builder
-category: Creational
+folder: builder
+permalink: /patterns/builder/
+categories: Creational
 language: en
 tags:
  - Gang of Four

business-delegate/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Business Delegate
-category: Structural
+folder: business-delegate
+permalink: /patterns/business-delegate/
+categories: Structural
 language: en
 tags:
  - Decoupling

bytecode/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Bytecode
-category: Behavioral
+folder: bytecode
+permalink: /patterns/bytecode/
+categories: Behavioral
 language: en
 tags:
  - Game programming

caching/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Caching
-category: Behavioral
+folder: caching
+permalink: /patterns/caching/
+categories: Behavioral
 language: en
 tags:
   - Performance
@@ -40,29 +43,39 @@ Wikipedia says:
 **Programmatic Example**
 
 Let's first look at the data layer of our application. The interesting classes are `UserAccount`
-which is a simple Java object containing the user account details, and `DbManager` interface which handles
-reading and writing of these objects to/from database.
+which is a simple Java object containing the user account details, and `DbManager` which handles
+reading and writing of these objects to/from MongoDB database.
 
 ```java
-@Data
+@Setter
+@Getter
 @AllArgsConstructor
 @ToString
-@EqualsAndHashCode
 public class UserAccount {
   private String userId;
   private String userName;
   private String additionalInfo;
 }
 
-public interface DbManager {
+@Slf4j
+public final class DbManager {
 
-  void connect();
-  void disconnect();
-  
-  UserAccount readFromDb(String userId);
-  UserAccount writeToDb(UserAccount userAccount);
-  UserAccount updateDb(UserAccount userAccount);
-  UserAccount upsertDb(UserAccount userAccount);
+  private static MongoClient mongoClient;
+  private static MongoDatabase db;
+
+  private DbManager() { /*...*/ }
+
+  public static void createVirtualDb() { /*...*/ }
+
+  public static void connect() throws ParseException { /*...*/ }
+
+  public static UserAccount readFromDb(String userId) { /*...*/ }
+
+  public static void writeToDb(UserAccount userAccount) { /*...*/ }
+
+  public static void updateDb(UserAccount userAccount) { /*...*/ }
+
+  public static void upsertDb(UserAccount userAccount) { /*...*/ }
 }
 ```
 
@@ -158,43 +171,30 @@ strategies.
 @Slf4j
 public class CacheStore {
 
-  private static final int CAPACITY = 3;
   private static LruCache cache;
-  private final DbManager dbManager;
 
   /* ... details omitted ... */
 
-  public UserAccount readThrough(final String userId) {
+  public static UserAccount readThrough(String userId) {
     if (cache.contains(userId)) {
-      LOGGER.info("# Found in Cache!");
+      LOGGER.info("# Cache Hit!");
       return cache.get(userId);
     }
-    LOGGER.info("# Not found in cache! Go to DB!!");
-    UserAccount userAccount = dbManager.readFromDb(userId);
+    LOGGER.info("# Cache Miss!");
+    UserAccount userAccount = DbManager.readFromDb(userId);
     cache.set(userId, userAccount);
     return userAccount;
   }
 
-  public void writeThrough(final UserAccount userAccount) {
+  public static void writeThrough(UserAccount userAccount) {
     if (cache.contains(userAccount.getUserId())) {
-      dbManager.updateDb(userAccount);
+      DbManager.updateDb(userAccount);
     } else {
-      dbManager.writeToDb(userAccount);
+      DbManager.writeToDb(userAccount);
     }
     cache.set(userAccount.getUserId(), userAccount);
   }
 
-  public void writeAround(final UserAccount userAccount) {
-    if (cache.contains(userAccount.getUserId())) {
-      dbManager.updateDb(userAccount);
-      // Cache data has been updated -- remove older
-      cache.invalidate(userAccount.getUserId());
-      // version from cache.
-    } else {
-      dbManager.writeToDb(userAccount);
-    }
-  }
-
   public static void clearCache() {
     if (cache != null) {
       cache.clear();
@@ -225,39 +225,34 @@ class.
 public final class AppManager {
 
   private static CachingPolicy cachingPolicy;
-  private final DbManager dbManager;
-  private final CacheStore cacheStore;
 
   private AppManager() {
   }
 
-  public void initDb() { /* ... */ }
+  public static void initDb(boolean useMongoDb) { /* ... */ }
 
   public static void initCachingPolicy(CachingPolicy policy) { /* ... */ }
 
   public static void initCacheCapacity(int capacity) { /* ... */ }
 
-  public UserAccount find(final String userId) {
-    LOGGER.info("Trying to find {} in cache", userId);
-    if (cachingPolicy == CachingPolicy.THROUGH
-            || cachingPolicy == CachingPolicy.AROUND) {
-      return cacheStore.readThrough(userId);
+  public static UserAccount find(String userId) {
+    if (cachingPolicy == CachingPolicy.THROUGH || cachingPolicy == CachingPolicy.AROUND) {
+      return CacheStore.readThrough(userId);
     } else if (cachingPolicy == CachingPolicy.BEHIND) {
-      return cacheStore.readThroughWithWriteBackPolicy(userId);
+      return CacheStore.readThroughWithWriteBackPolicy(userId);
     } else if (cachingPolicy == CachingPolicy.ASIDE) {
       return findAside(userId);
     }
     return null;
   }
 
-  public void save(final UserAccount userAccount) {
-    LOGGER.info("Save record!");
+  public static void save(UserAccount userAccount) {
     if (cachingPolicy == CachingPolicy.THROUGH) {
-      cacheStore.writeThrough(userAccount);
+      CacheStore.writeThrough(userAccount);
     } else if (cachingPolicy == CachingPolicy.AROUND) {
-      cacheStore.writeAround(userAccount);
+      CacheStore.writeAround(userAccount);
     } else if (cachingPolicy == CachingPolicy.BEHIND) {
-      cacheStore.writeBehind(userAccount);
+      CacheStore.writeBehind(userAccount);
     } else if (cachingPolicy == CachingPolicy.ASIDE) {
       saveAside(userAccount);
     }
@@ -277,35 +272,24 @@ Here is what we do in the main class of the application.
 @Slf4j
 public class App {
 
-  public static void main(final String[] args) {
-    boolean isDbMongo = isDbMongo(args);
-    if(isDbMongo){
-      LOGGER.info("Using the Mongo database engine to run the application.");
-    } else {
-      LOGGER.info("Using the 'in Memory' database to run the application.");
-    }
-    App app = new App(isDbMongo);
+  public static void main(String[] args) {
+    AppManager.initDb(false);
+    AppManager.initCacheCapacity(3);
+    var app = new App();
     app.useReadAndWriteThroughStrategy();
-    String splitLine = "==============================================";
-    LOGGER.info(splitLine);
     app.useReadThroughAndWriteAroundStrategy();
-    LOGGER.info(splitLine);
     app.useReadThroughAndWriteBehindStrategy();
-    LOGGER.info(splitLine);
     app.useCacheAsideStategy();
-    LOGGER.info(splitLine);
   }
 
   public void useReadAndWriteThroughStrategy() {
     LOGGER.info("# CachingPolicy.THROUGH");
-    appManager.initCachingPolicy(CachingPolicy.THROUGH);
-
+    AppManager.initCachingPolicy(CachingPolicy.THROUGH);
     var userAccount1 = new UserAccount("001", "John", "He is a boy.");
-
-    appManager.save(userAccount1);
-    LOGGER.info(appManager.printCacheContent());
-    appManager.find("001");
-    appManager.find("001");
+    AppManager.save(userAccount1);
+    LOGGER.info(AppManager.printCacheContent());
+    AppManager.find("001");
+    AppManager.find("001");
   }
 
   public void useReadThroughAndWriteAroundStrategy() { /* ... */ }
@@ -316,6 +300,16 @@ public class App {
 }
 ```
 
+Finally, here is some of the console output from the program.
+
+```
+12:32:53.845 [main] INFO com.iluwatar.caching.App - # CachingPolicy.THROUGH
+12:32:53.900 [main] INFO com.iluwatar.caching.App - 
+--CACHE CONTENT--
+UserAccount(userId=001, userName=John, additionalInfo=He is a boy.)
+----
+```
+
 ## Class diagram
 
 ![alt text](./etc/caching.png "Caching")

caching/docker-compose.yml

@@ -1,11 +0,0 @@
-version: '3.7'
-services:
-  mongodb_container:
-    image: mongo:latest
-    environment:
-      MONGO_INITDB_ROOT_USERNAME: root
-      MONGO_INITDB_ROOT_PASSWORD: rootpassword
-    ports:
-      - 27017:27017
-    volumes:
-      - ./mongo-data/:/data/db

caching/pom.xml

@@ -39,21 +39,19 @@
       <scope>test</scope>
     </dependency>
     <dependency>
-      <groupId>org.mockito</groupId>
-      <artifactId>mockito-junit-jupiter</artifactId>
-      <version>3.12.4</version>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.mockito</groupId>
-      <artifactId>mockito-all</artifactId>
-      <version>1.10.19</version>
-      <scope>test</scope>
+      <groupId>org.mongodb</groupId>
+      <artifactId>mongodb-driver</artifactId>
+      <version>3.12.1</version>
     </dependency>
     <dependency>
       <groupId>org.mongodb</groupId>
-      <artifactId>mongo-java-driver</artifactId>
-      <version>3.4.1</version>
+      <artifactId>mongodb-driver-core</artifactId>
+      <version>3.0.4</version>
+    </dependency>
+    <dependency>
+      <groupId>org.mongodb</groupId>
+      <artifactId>bson</artifactId>
+      <version>3.0.4</version>
     </dependency>
   </dependencies>
   <!--

caching/src/main/java/com/iluwatar/caching/App.java

@@ -1,62 +1,58 @@
+/*
+ * 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.caching;
 
-import com.iluwatar.caching.database.DbManager;
-import com.iluwatar.caching.database.DbManagerFactory;
 import lombok.extern.slf4j.Slf4j;
 
 /**
- * The Caching pattern describes how to avoid expensive re-acquisition of
- * resources by not releasing the resources immediately after their use.
- * The resources retain their identity, are kept in some fast-access storage,
- * and are re-used to avoid having to acquire them again. There are four main
- * caching strategies/techniques in this pattern; each with their own pros and
- * cons. They are <code>write-through</code> which writes data to the cache and
- * DB in a single transaction, <code>write-around</code> which writes data
- * immediately into the DB instead of the cache, <code>write-behind</code>
- * which writes data into the cache initially whilst the data is only
- * written into the DB when the cache is full, and <code>cache-aside</code>
- * which pushes the responsibility of keeping the data synchronized in both
- * data sources to the application itself. The <code>read-through</code>
- * strategy is also included in the mentioned four strategies --
- * returns data from the cache to the caller <b>if</b> it exists <b>else</b>
- * queries from DB and stores it into the cache for future use. These strategies
- * determine when the data in the cache should be written back to the backing
- * store (i.e. Database) and help keep both data sources
- * synchronized/up-to-date. This pattern can improve performance and also helps
- * to maintainconsistency between data held in the cache and the data in
- * the underlying data store.
+ * The Caching pattern describes how to avoid expensive re-acquisition of resources by not releasing
+ * the resources immediately after their use. The resources retain their identity, are kept in some
+ * fast-access storage, and are re-used to avoid having to acquire them again. There are four main
+ * caching strategies/techniques in this pattern; each with their own pros and cons. They are;
+ * <code>write-through</code> which writes data to the cache and DB in a single transaction,
+ * <code>write-around</code> which writes data immediately into the DB instead of the cache,
+ * <code>write-behind</code> which writes data into the cache initially whilst the data is only
+ * written into the DB when the cache is full, and <code>cache-aside</code> which pushes the
+ * responsibility of keeping the data synchronized in both data sources to the application itself.
+ * The <code>read-through</code> strategy is also included in the mentioned four strategies --
+ * returns data from the cache to the caller <b>if</b> it exists <b>else</b> queries from DB and
+ * stores it into the cache for future use. These strategies determine when the data in the cache
+ * should be written back to the backing store (i.e. Database) and help keep both data sources
+ * synchronized/up-to-date. This pattern can improve performance and also helps to maintain
+ * consistency between data held in the cache and the data in the underlying data store.
  *
- * <p>In this example, the user account ({@link UserAccount}) entity is used
- * as the underlying application data. The cache itself is implemented as an
- * internal (Java) data structure. It adopts a Least-Recently-Used (LRU)
- * strategy for evicting data from itself when its full. The four
- * strategies are individually tested. The testing of the cache is restricted
- * towards saving and querying of user accounts from the
- * underlying data store( {@link DbManager}). The main class ( {@link App}
- * is not aware of the underlying mechanics of the application
- * (i.e. save and query) and whether the data is coming from the cache or the
- * DB (i.e. separation of concern). The AppManager ({@link AppManager}) handles
- * the transaction of data to-and-from the underlying data store (depending on
- * the preferred caching policy/strategy).
+ * <p>In this example, the user account ({@link UserAccount}) entity is used as the underlying
+ * application data. The cache itself is implemented as an internal (Java) data structure. It adopts
+ * a Least-Recently-Used (LRU) strategy for evicting data from itself when its full. The four
+ * strategies are individually tested. The testing of the cache is restricted towards saving and
+ * querying of user accounts from the underlying data store ( {@link DbManager}). The main class (
+ * {@link App} is not aware of the underlying mechanics of the application (i.e. save and query) and
+ * whether the data is coming from the cache or the DB (i.e. separation of concern). The AppManager
+ * ({@link AppManager}) handles the transaction of data to-and-from the underlying data store
+ * (depending on the preferred caching policy/strategy).
  * <p>
- * <i>{@literal App --> AppManager --> CacheStore/LRUCache/CachingPolicy -->
- * DBManager} </i>
- * </p>
- *
- * <p>
- * There are 2 ways to launch the application.
- *  - to use "in Memory" database.
- *  - to use the MongoDb as a database
- *
- * To run the application with "in Memory" database, just launch it without parameters
- * Example: 'java -jar app.jar'
- *
- * To run the application with MongoDb you need to be installed the MongoDb
- * in your system, or to launch it in the docker container.
- * You may launch docker container from the root of current module with command:
- * 'docker-compose up'
- * Then you can start the application with parameter --mongo
- * Example: 'java -jar app.jar --mongo'
+ * <i>{@literal App --> AppManager --> CacheStore/LRUCache/CachingPolicy --> DBManager} </i>
  * </p>
  *
  * @see CacheStore
@@ -65,67 +61,23 @@ import lombok.extern.slf4j.Slf4j;
  */
 @Slf4j
 public class App {
-  /**
-   * Constant parameter name to use mongoDB.
-   */
-  private static final String USE_MONGO_DB = "--mongo";
-  /**
-   * Application manager.
-   */
-  private final AppManager appManager;
-
-  /**
-   * Constructor of current App.
-   *
-   * @param isMongo boolean
-   */
-  public App(final boolean isMongo) {
-    DbManager dbManager = DbManagerFactory.initDb(isMongo);
-    appManager = new AppManager(dbManager);
-    appManager.initDb();
-  }
 
   /**
    * Program entry point.
    *
    * @param args command line args
    */
-  public static void main(final String[] args) {
-    // VirtualDB (instead of MongoDB) was used in running the JUnit tests
+  public static void main(String[] args) {
+    AppManager.initDb(false); // VirtualDB (instead of MongoDB) was used in running the JUnit tests
     // and the App class to avoid Maven compilation errors. Set flag to
     // true to run the tests with MongoDB (provided that MongoDB is
     // installed and socket connection is open).
-    boolean isDbMongo = isDbMongo(args);
-    if (isDbMongo) {
-      LOGGER.info("Using the Mongo database engine to run the application.");
-    } else {
-      LOGGER.info("Using the 'in Memory' database to run the application.");
-    }
-    App app = new App(isDbMongo);
+    AppManager.initCacheCapacity(3);
+    var app = new App();
     app.useReadAndWriteThroughStrategy();
-    String splitLine = "==============================================";
-    LOGGER.info(splitLine);
     app.useReadThroughAndWriteAroundStrategy();
-    LOGGER.info(splitLine);
     app.useReadThroughAndWriteBehindStrategy();
-    LOGGER.info(splitLine);
     app.useCacheAsideStategy();
-    LOGGER.info(splitLine);
-  }
-
-  /**
-   * Check the input parameters. if
-   *
-   * @param args input params
-   * @return true if there is "--mongo" parameter in arguments
-   */
-  private static boolean isDbMongo(final String[] args) {
-    for (String arg : args) {
-      if (arg.equals(USE_MONGO_DB)) {
-        return true;
-      }
-    }
-    return false;
   }
 
   /**
@@ -133,14 +85,14 @@ public class App {
    */
   public void useReadAndWriteThroughStrategy() {
     LOGGER.info("# CachingPolicy.THROUGH");
-    appManager.initCachingPolicy(CachingPolicy.THROUGH);
+    AppManager.initCachingPolicy(CachingPolicy.THROUGH);
 
     var userAccount1 = new UserAccount("001", "John", "He is a boy.");
 
-    appManager.save(userAccount1);
-    LOGGER.info(appManager.printCacheContent());
-    appManager.find("001");
-    appManager.find("001");
+    AppManager.save(userAccount1);
+    LOGGER.info(AppManager.printCacheContent());
+    AppManager.find("001");
+    AppManager.find("001");
   }
 
   /**
@@ -148,21 +100,21 @@ public class App {
    */
   public void useReadThroughAndWriteAroundStrategy() {
     LOGGER.info("# CachingPolicy.AROUND");
-    appManager.initCachingPolicy(CachingPolicy.AROUND);
+    AppManager.initCachingPolicy(CachingPolicy.AROUND);
 
     var userAccount2 = new UserAccount("002", "Jane", "She is a girl.");
 
-    appManager.save(userAccount2);
-    LOGGER.info(appManager.printCacheContent());
-    appManager.find("002");
-    LOGGER.info(appManager.printCacheContent());
-    userAccount2 = appManager.find("002");
+    AppManager.save(userAccount2);
+    LOGGER.info(AppManager.printCacheContent());
+    AppManager.find("002");
+    LOGGER.info(AppManager.printCacheContent());
+    userAccount2 = AppManager.find("002");
     userAccount2.setUserName("Jane G.");
-    appManager.save(userAccount2);
-    LOGGER.info(appManager.printCacheContent());
-    appManager.find("002");
-    LOGGER.info(appManager.printCacheContent());
-    appManager.find("002");
+    AppManager.save(userAccount2);
+    LOGGER.info(AppManager.printCacheContent());
+    AppManager.find("002");
+    LOGGER.info(AppManager.printCacheContent());
+    AppManager.find("002");
   }
 
   /**
@@ -170,31 +122,23 @@ public class App {
    */
   public void useReadThroughAndWriteBehindStrategy() {
     LOGGER.info("# CachingPolicy.BEHIND");
-    appManager.initCachingPolicy(CachingPolicy.BEHIND);
+    AppManager.initCachingPolicy(CachingPolicy.BEHIND);
 
-    var userAccount3 = new UserAccount("003",
-            "Adam",
-            "He likes food.");
-    var userAccount4 = new UserAccount("004",
-            "Rita",
-            "She hates cats.");
-    var userAccount5 = new UserAccount("005",
-            "Isaac",
-            "He is allergic to mustard.");
+    var userAccount3 = new UserAccount("003", "Adam", "He likes food.");
+    var userAccount4 = new UserAccount("004", "Rita", "She hates cats.");
+    var userAccount5 = new UserAccount("005", "Isaac", "He is allergic to mustard.");
 
-    appManager.save(userAccount3);
-    appManager.save(userAccount4);
-    appManager.save(userAccount5);
-    LOGGER.info(appManager.printCacheContent());
-    appManager.find("003");
-    LOGGER.info(appManager.printCacheContent());
-    UserAccount userAccount6 = new UserAccount("006",
-            "Yasha",
-            "She is an only child.");
-    appManager.save(userAccount6);
-    LOGGER.info(appManager.printCacheContent());
-    appManager.find("004");
-    LOGGER.info(appManager.printCacheContent());
+    AppManager.save(userAccount3);
+    AppManager.save(userAccount4);
+    AppManager.save(userAccount5);
+    LOGGER.info(AppManager.printCacheContent());
+    AppManager.find("003");
+    LOGGER.info(AppManager.printCacheContent());
+    UserAccount userAccount6 = new UserAccount("006", "Yasha", "She is an only child.");
+    AppManager.save(userAccount6);
+    LOGGER.info(AppManager.printCacheContent());
+    AppManager.find("004");
+    LOGGER.info(AppManager.printCacheContent());
   }
 
   /**
@@ -202,26 +146,20 @@ public class App {
    */
   public void useCacheAsideStategy() {
     LOGGER.info("# CachingPolicy.ASIDE");
-    appManager.initCachingPolicy(CachingPolicy.ASIDE);
-    LOGGER.info(appManager.printCacheContent());
+    AppManager.initCachingPolicy(CachingPolicy.ASIDE);
+    LOGGER.info(AppManager.printCacheContent());
 
-    var userAccount3 = new UserAccount("003",
-            "Adam",
-            "He likes food.");
-    var userAccount4 = new UserAccount("004",
-            "Rita",
-            "She hates cats.");
-    var userAccount5 = new UserAccount("005",
-            "Isaac",
-            "He is allergic to mustard.");
-    appManager.save(userAccount3);
-    appManager.save(userAccount4);
-    appManager.save(userAccount5);
+    var userAccount3 = new UserAccount("003", "Adam", "He likes food.");
+    var userAccount4 = new UserAccount("004", "Rita", "She hates cats.");
+    var userAccount5 = new UserAccount("005", "Isaac", "He is allergic to mustard.");
+    AppManager.save(userAccount3);
+    AppManager.save(userAccount4);
+    AppManager.save(userAccount5);
 
-    LOGGER.info(appManager.printCacheContent());
-    appManager.find("003");
-    LOGGER.info(appManager.printCacheContent());
-    appManager.find("004");
-    LOGGER.info(appManager.printCacheContent());
+    LOGGER.info(AppManager.printCacheContent());
+    AppManager.find("003");
+    LOGGER.info(AppManager.printCacheContent());
+    AppManager.find("004");
+    LOGGER.info(AppManager.printCacheContent());
   }
 }

caching/src/main/java/com/iluwatar/caching/AppManager.java

@@ -23,80 +23,65 @@
 
 package com.iluwatar.caching;
 
-import com.iluwatar.caching.database.DbManager;
-
+import java.text.ParseException;
 import java.util.Optional;
-
 import lombok.extern.slf4j.Slf4j;
 
 /**
- * AppManager helps to bridge the gap in communication between the main class
- * and the application's back-end. DB connection is initialized through this
- * class. The chosen  caching strategy/policy is also initialized here.
- * Before the cache can be used, the size of the  cache has to be set.
- * Depending on the chosen caching policy, AppManager will call the
- * appropriate function in the CacheStore class.
+ * AppManager helps to bridge the gap in communication between the main class and the application's
+ * back-end. DB connection is initialized through this class. The chosen caching strategy/policy is
+ * also initialized here. Before the cache can be used, the size of the cache has to be set.
+ * Depending on the chosen caching policy, AppManager will call the appropriate function in the
+ * CacheStore class.
  */
 @Slf4j
-public class AppManager {
-  /**
-   * Caching Policy.
-   */
-  private CachingPolicy cachingPolicy;
-  /**
-   * Database Manager.
-   */
-  private final DbManager dbManager;
-  /**
-   * Cache Store.
-   */
-  private final CacheStore cacheStore;
+public final class AppManager {
 
-  /**
-   * Constructor.
-   *
-   * @param newDbManager database manager
-   */
-  public AppManager(final DbManager newDbManager) {
-    this.dbManager = newDbManager;
-    this.cacheStore = new CacheStore(newDbManager);
+  private static CachingPolicy cachingPolicy;
+
+  private AppManager() {
   }
 
   /**
-   * Developer/Tester is able to choose whether the application should use
-   * MongoDB as its underlying data storage or a simple Java data structure
-   * to (temporarily) store the data/objects during runtime.
+   * Developer/Tester is able to choose whether the application should use MongoDB as its underlying
+   * data storage or a simple Java data structure to (temporarily) store the data/objects during
+   * runtime.
    */
-  public void initDb() {
-    dbManager.connect();
+  public static void initDb(boolean useMongoDb) {
+    if (useMongoDb) {
+      try {
+        DbManager.connect();
+      } catch (ParseException e) {
+        LOGGER.error("Error connecting to MongoDB", e);
+      }
+    } else {
+      DbManager.createVirtualDb();
+    }
   }
 
   /**
    * Initialize caching policy.
-   *
-   * @param policy is a {@link CachingPolicy}
    */
-  public void initCachingPolicy(final CachingPolicy policy) {
+  public static void initCachingPolicy(CachingPolicy policy) {
     cachingPolicy = policy;
     if (cachingPolicy == CachingPolicy.BEHIND) {
-      Runtime.getRuntime().addShutdownHook(new Thread(cacheStore::flushCache));
+      Runtime.getRuntime().addShutdownHook(new Thread(CacheStore::flushCache));
     }
-    cacheStore.clearCache();
+    CacheStore.clearCache();
+  }
+
+  public static void initCacheCapacity(int capacity) {
+    CacheStore.initCapacity(capacity);
   }
 
   /**
    * Find user account.
-   *
-   * @param userId String
-   * @return {@link UserAccount}
    */
-  public UserAccount find(final String userId) {
-    LOGGER.info("Trying to find {} in cache", userId);
-    if (cachingPolicy == CachingPolicy.THROUGH
-            || cachingPolicy == CachingPolicy.AROUND) {
-      return cacheStore.readThrough(userId);
+  public static UserAccount find(String userId) {
+    if (cachingPolicy == CachingPolicy.THROUGH || cachingPolicy == CachingPolicy.AROUND) {
+      return CacheStore.readThrough(userId);
     } else if (cachingPolicy == CachingPolicy.BEHIND) {
-      return cacheStore.readThroughWithWriteBackPolicy(userId);
+      return CacheStore.readThroughWithWriteBackPolicy(userId);
     } else if (cachingPolicy == CachingPolicy.ASIDE) {
       return findAside(userId);
     }
@@ -105,55 +90,41 @@ public class AppManager {
 
   /**
    * Save user account.
-   *
-   * @param userAccount {@link UserAccount}
    */
-  public void save(final UserAccount userAccount) {
-    LOGGER.info("Save record!");
+  public static void save(UserAccount userAccount) {
     if (cachingPolicy == CachingPolicy.THROUGH) {
-      cacheStore.writeThrough(userAccount);
+      CacheStore.writeThrough(userAccount);
     } else if (cachingPolicy == CachingPolicy.AROUND) {
-      cacheStore.writeAround(userAccount);
+      CacheStore.writeAround(userAccount);
     } else if (cachingPolicy == CachingPolicy.BEHIND) {
-      cacheStore.writeBehind(userAccount);
+      CacheStore.writeBehind(userAccount);
     } else if (cachingPolicy == CachingPolicy.ASIDE) {
       saveAside(userAccount);
     }
   }
 
-  /**
-   * Returns String.
-   *
-   * @return String
-   */
-  public String printCacheContent() {
-    return cacheStore.print();
+  public static String printCacheContent() {
+    return CacheStore.print();
   }
 
   /**
    * Cache-Aside save user account helper.
-   *
-   * @param userAccount {@link UserAccount}
    */
-  private void saveAside(final UserAccount userAccount) {
-    dbManager.updateDb(userAccount);
-    cacheStore.invalidate(userAccount.getUserId());
+  private static void saveAside(UserAccount userAccount) {
+    DbManager.updateDb(userAccount);
+    CacheStore.invalidate(userAccount.getUserId());
   }
 
   /**
    * Cache-Aside find user account helper.
-   *
-   * @param userId String
-   * @return {@link UserAccount}
    */
-  private UserAccount findAside(final String userId) {
-    return Optional.ofNullable(cacheStore.get(userId))
-            .or(() -> {
-              Optional<UserAccount> userAccount =
-                      Optional.ofNullable(dbManager.readFromDb(userId));
-              userAccount.ifPresent(account -> cacheStore.set(userId, account));
-              return userAccount;
-            })
-            .orElse(null);
+  private static UserAccount findAside(String userId) {
+    return Optional.ofNullable(CacheStore.get(userId))
+        .or(() -> {
+          Optional<UserAccount> userAccount = Optional.ofNullable(DbManager.readFromDb(userId));
+          userAccount.ifPresent(account -> CacheStore.set(userId, account));
+          return userAccount;
+        })
+        .orElse(null);
   }
 }

caching/src/main/java/com/iluwatar/caching/CacheStore.java

@@ -23,11 +23,9 @@
 
 package com.iluwatar.caching;
 
-import com.iluwatar.caching.database.DbManager;
 import java.util.List;
 import java.util.Optional;
 import java.util.stream.Collectors;
-
 import lombok.extern.slf4j.Slf4j;
 
 /**
@@ -35,34 +33,16 @@ import lombok.extern.slf4j.Slf4j;
  */
 @Slf4j
 public class CacheStore {
-  /**
-   * Cache capacity.
-   */
-  private static final int CAPACITY = 3;
 
-  /**
-   * Lru cache see {@link LruCache}.
-   */
-  private LruCache cache;
-  /**
-   * DbManager.
-   */
-  private final DbManager dbManager;
+  private static LruCache cache;
 
-  /**
-   * Cache Store.
-   * @param dataBaseManager {@link DbManager}
-   */
-  public CacheStore(final DbManager dataBaseManager) {
-    this.dbManager = dataBaseManager;
-    initCapacity(CAPACITY);
+  private CacheStore() {
   }
 
   /**
    * Init cache capacity.
-   * @param capacity int
    */
-  public void initCapacity(final int capacity) {
+  public static void initCapacity(int capacity) {
     if (cache == null) {
       cache = new LruCache(capacity);
     } else {
@@ -72,64 +52,57 @@ public class CacheStore {
 
   /**
    * Get user account using read-through cache.
-   * @param userId {@link String}
-   * @return {@link UserAccount}
    */
-  public UserAccount readThrough(final String userId) {
+  public static UserAccount readThrough(String userId) {
     if (cache.contains(userId)) {
-      LOGGER.info("# Found in Cache!");
+      LOGGER.info("# Cache Hit!");
       return cache.get(userId);
     }
-    LOGGER.info("# Not found in cache! Go to DB!!");
-    UserAccount userAccount = dbManager.readFromDb(userId);
+    LOGGER.info("# Cache Miss!");
+    UserAccount userAccount = DbManager.readFromDb(userId);
     cache.set(userId, userAccount);
     return userAccount;
   }
 
   /**
    * Get user account using write-through cache.
-   * @param userAccount {@link UserAccount}
    */
-  public void writeThrough(final UserAccount userAccount) {
+  public static void writeThrough(UserAccount userAccount) {
     if (cache.contains(userAccount.getUserId())) {
-      dbManager.updateDb(userAccount);
+      DbManager.updateDb(userAccount);
     } else {
-      dbManager.writeToDb(userAccount);
+      DbManager.writeToDb(userAccount);
     }
     cache.set(userAccount.getUserId(), userAccount);
   }
 
   /**
    * Get user account using write-around cache.
-   * @param userAccount {@link UserAccount}
    */
-  public void writeAround(final UserAccount userAccount) {
+  public static void writeAround(UserAccount userAccount) {
     if (cache.contains(userAccount.getUserId())) {
-      dbManager.updateDb(userAccount);
-      // Cache data has been updated -- remove older
-      cache.invalidate(userAccount.getUserId());
+      DbManager.updateDb(userAccount);
+      cache.invalidate(userAccount.getUserId()); // Cache data has been updated -- remove older
       // version from cache.
     } else {
-      dbManager.writeToDb(userAccount);
+      DbManager.writeToDb(userAccount);
     }
   }
 
   /**
    * Get user account using read-through cache with write-back policy.
-   * @param userId {@link String}
-   * @return {@link UserAccount}
    */
-  public UserAccount readThroughWithWriteBackPolicy(final String userId) {
+  public static UserAccount readThroughWithWriteBackPolicy(String userId) {
     if (cache.contains(userId)) {
-      LOGGER.info("# Found in cache!");
+      LOGGER.info("# Cache Hit!");
       return cache.get(userId);
     }
-    LOGGER.info("# Not found in Cache!");
-    UserAccount userAccount = dbManager.readFromDb(userId);
+    LOGGER.info("# Cache Miss!");
+    UserAccount userAccount = DbManager.readFromDb(userId);
     if (cache.isFull()) {
       LOGGER.info("# Cache is FULL! Writing LRU data to DB...");
       UserAccount toBeWrittenToDb = cache.getLruData();
-      dbManager.upsertDb(toBeWrittenToDb);
+      DbManager.upsertDb(toBeWrittenToDb);
     }
     cache.set(userId, userAccount);
     return userAccount;
@@ -137,13 +110,12 @@ public class CacheStore {
 
   /**
    * Set user account.
-   * @param userAccount {@link UserAccount}
    */
-  public void writeBehind(final UserAccount userAccount) {
+  public static void writeBehind(UserAccount userAccount) {
     if (cache.isFull() && !cache.contains(userAccount.getUserId())) {
       LOGGER.info("# Cache is FULL! Writing LRU data to DB...");
       UserAccount toBeWrittenToDb = cache.getLruData();
-      dbManager.upsertDb(toBeWrittenToDb);
+      DbManager.upsertDb(toBeWrittenToDb);
     }
     cache.set(userAccount.getUserId(), userAccount);
   }
@@ -151,7 +123,7 @@ public class CacheStore {
   /**
    * Clears cache.
    */
-  public void clearCache() {
+  public static void clearCache() {
     if (cache != null) {
       cache.clear();
     }
@@ -160,51 +132,44 @@ public class CacheStore {
   /**
    * Writes remaining content in the cache into the DB.
    */
-  public void flushCache() {
+  public static void flushCache() {
     LOGGER.info("# flushCache...");
     Optional.ofNullable(cache)
         .map(LruCache::getCacheDataInListForm)
         .orElse(List.of())
-        .forEach(dbManager::updateDb);
-    dbManager.disconnect();
+        .forEach(DbManager::updateDb);
   }
 
   /**
    * Print user accounts.
-   * @return {@link String}
    */
-  public String print() {
+  public static String print() {
     return Optional.ofNullable(cache)
         .map(LruCache::getCacheDataInListForm)
         .orElse(List.of())
         .stream()
         .map(userAccount -> userAccount.toString() + "\n")
-        .collect(Collectors.joining("", "\n--CACHE CONTENT--\n", "----"));
+        .collect(Collectors.joining("", "\n--CACHE CONTENT--\n", "----\n"));
   }
 
   /**
    * Delegate to backing cache store.
-   * @param userId {@link String}
-   * @return {@link UserAccount}
    */
-  public UserAccount get(final String userId) {
+  public static UserAccount get(String userId) {
     return cache.get(userId);
   }
 
   /**
    * Delegate to backing cache store.
-   * @param userId {@link String}
-   * @param userAccount {@link UserAccount}
    */
-  public void set(final String userId, final UserAccount userAccount) {
+  public static void set(String userId, UserAccount userAccount) {
     cache.set(userId, userAccount);
   }
 
   /**
    * Delegate to backing cache store.
-   * @param userId {@link String}
    */
-  public void invalidate(final String userId) {
+  public static void invalidate(String userId) {
     cache.invalidate(userId);
   }
 }

caching/src/main/java/com/iluwatar/caching/CachingPolicy.java

@@ -32,25 +32,10 @@ import lombok.Getter;
 @AllArgsConstructor
 @Getter
 public enum CachingPolicy {
-  /**
-   * Through.
-   */
   THROUGH("through"),
-  /**
-   * AROUND.
-   */
   AROUND("around"),
-  /**
-   * BEHIND.
-   */
   BEHIND("behind"),
-  /**
-   * ASIDE.
-   */
   ASIDE("aside");
 
-  /**
-   * Policy value.
-   */
   private final String policy;
 }

caching/src/main/java/com/iluwatar/caching/DbManager.java

@@ -0,0 +1,171 @@
+/*
+ * 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.caching;
+
+import com.iluwatar.caching.constants.CachingConstants;
+import com.mongodb.MongoClient;
+import com.mongodb.client.MongoDatabase;
+import com.mongodb.client.model.UpdateOptions;
+import java.text.ParseException;
+import java.util.HashMap;
+import java.util.Map;
+import lombok.extern.slf4j.Slf4j;
+import org.bson.Document;
+
+/**
+ * <p>DBManager handles the communication with the underlying data store i.e. Database. It contains
+ * the implemented methods for querying, inserting, and updating data. MongoDB was used as the
+ * database for the application.</p>
+ *
+ * <p>Developer/Tester is able to choose whether the application should use MongoDB as its
+ * underlying data storage (connect()) or a simple Java data structure to (temporarily) store the
+ * data/objects during runtime (createVirtualDB()).</p>
+ */
+@Slf4j
+public final class DbManager {
+
+  private static MongoClient mongoClient;
+  private static MongoDatabase db;
+  private static boolean useMongoDB;
+
+  private static Map<String, UserAccount> virtualDB;
+
+  private DbManager() {
+  }
+
+  /**
+   * Create DB.
+   */
+  public static void createVirtualDb() {
+    useMongoDB = false;
+    virtualDB = new HashMap<>();
+  }
+
+  /**
+   * Connect to DB.
+   */
+  public static void connect() throws ParseException {
+    useMongoDB = true;
+    mongoClient = new MongoClient();
+    db = mongoClient.getDatabase("test");
+  }
+
+  /**
+   * Read user account from DB.
+   */
+  public static UserAccount readFromDb(String userId) {
+    if (!useMongoDB) {
+      if (virtualDB.containsKey(userId)) {
+        return virtualDB.get(userId);
+      }
+      return null;
+    }
+    if (db == null) {
+      try {
+        connect();
+      } catch (ParseException e) {
+        LOGGER.error("Error connecting to MongoDB", e);
+      }
+    }
+    var iterable = db
+        .getCollection(CachingConstants.USER_ACCOUNT)
+        .find(new Document(CachingConstants.USER_ID, userId));
+    if (iterable == null) {
+      return null;
+    }
+    Document doc = iterable.first();
+    String userName = doc.getString(CachingConstants.USER_NAME);
+    String appInfo = doc.getString(CachingConstants.ADD_INFO);
+    return new UserAccount(userId, userName, appInfo);
+  }
+
+  /**
+   * Write user account to DB.
+   */
+  public static void writeToDb(UserAccount userAccount) {
+    if (!useMongoDB) {
+      virtualDB.put(userAccount.getUserId(), userAccount);
+      return;
+    }
+    if (db == null) {
+      try {
+        connect();
+      } catch (ParseException e) {
+        LOGGER.error("Error connecting to MongoDB", e);
+      }
+    }
+    db.getCollection(CachingConstants.USER_ACCOUNT).insertOne(
+        new Document(CachingConstants.USER_ID, userAccount.getUserId())
+            .append(CachingConstants.USER_NAME, userAccount.getUserName())
+            .append(CachingConstants.ADD_INFO, userAccount.getAdditionalInfo())
+    );
+  }
+
+  /**
+   * Update DB.
+   */
+  public static void updateDb(UserAccount userAccount) {
+    if (!useMongoDB) {
+      virtualDB.put(userAccount.getUserId(), userAccount);
+      return;
+    }
+    if (db == null) {
+      try {
+        connect();
+      } catch (ParseException e) {
+        LOGGER.error("Error connecting to MongoDB", e);
+      }
+    }
+    db.getCollection(CachingConstants.USER_ACCOUNT).updateOne(
+        new Document(CachingConstants.USER_ID, userAccount.getUserId()),
+        new Document("$set", new Document(CachingConstants.USER_NAME, userAccount.getUserName())
+            .append(CachingConstants.ADD_INFO, userAccount.getAdditionalInfo())));
+  }
+
+  /**
+   * Insert data into DB if it does not exist. Else, update it.
+   */
+  public static void upsertDb(UserAccount userAccount) {
+    if (!useMongoDB) {
+      virtualDB.put(userAccount.getUserId(), userAccount);
+      return;
+    }
+    if (db == null) {
+      try {
+        connect();
+      } catch (ParseException e) {
+        LOGGER.error("Error connecting to MongoDB", e);
+      }
+    }
+    db.getCollection(CachingConstants.USER_ACCOUNT).updateOne(
+        new Document(CachingConstants.USER_ID, userAccount.getUserId()),
+        new Document("$set",
+            new Document(CachingConstants.USER_ID, userAccount.getUserId())
+                .append(CachingConstants.USER_NAME, userAccount.getUserName())
+                .append(CachingConstants.ADD_INFO, userAccount.getAdditionalInfo())
+        ),
+        new UpdateOptions().upsert(true)
+    );
+  }
+}

caching/src/main/java/com/iluwatar/caching/LruCache.java

@@ -29,83 +29,41 @@ import java.util.List;
 import java.util.Map;
 import lombok.extern.slf4j.Slf4j;
 
-
 /**
- * Data structure/implementation of the application's cache. The data structure
- * consists of a hash table attached with a doubly linked-list. The linked-list
- * helps in capturing and maintaining the LRU data in the cache. When a data is
- * queried (from the cache), added (to the cache), or updated, the data is
- * moved to the front of the list to depict itself as the most-recently-used
- * data. The LRU data is always at the end of the list.
+ * Data structure/implementation of the application's cache. The data structure consists of a hash
+ * table attached with a doubly linked-list. The linked-list helps in capturing and maintaining the
+ * LRU data in the cache. When a data is queried (from the cache), added (to the cache), or updated,
+ * the data is moved to the front of the list to depict itself as the most-recently-used data. The
+ * LRU data is always at the end of the list.
  */
 @Slf4j
 public class LruCache {
-  /**
-   * Static class Node.
-   */
-  static class Node {
-    /**
-     * user id.
-     */
-    private final String userId;
-    /**
-     * User Account.
-     */
-    private UserAccount userAccount;
-    /**
-     * previous.
-     */
-    private Node previous;
-    /**
-     * next.
-     */
-    private Node next;
 
-    /**
-     * Node definition.
-     *
-     * @param id      String
-     * @param account {@link UserAccount}
-     */
-    Node(final String id, final UserAccount account) {
-      this.userId = id;
-      this.userAccount = account;
+  static class Node {
+    String userId;
+    UserAccount userAccount;
+    Node previous;
+    Node next;
+
+    public Node(String userId, UserAccount userAccount) {
+      this.userId = userId;
+      this.userAccount = userAccount;
     }
   }
 
-  /**
-   * Capacity of Cache.
-   */
-  private int capacity;
-  /**
-   * Cache {@link HashMap}.
-   */
-  private Map<String, Node> cache = new HashMap<>();
-  /**
-   * Head.
-   */
-  private Node head;
-  /**
-   * End.
-   */
-  private Node end;
+  int capacity;
+  Map<String, Node> cache = new HashMap<>();
+  Node head;
+  Node end;
 
-  /**
-   * Constructor.
-   *
-   * @param cap Integer.
-   */
-  public LruCache(final int cap) {
-    this.capacity = cap;
+  public LruCache(int capacity) {
+    this.capacity = capacity;
   }
 
   /**
    * Get user account.
-   *
-   * @param userId String
-   * @return {@link UserAccount}
    */
-  public UserAccount get(final String userId) {
+  public UserAccount get(String userId) {
     if (cache.containsKey(userId)) {
       var node = cache.get(userId);
       remove(node);
@@ -117,10 +75,8 @@ public class LruCache {
 
   /**
    * Remove node from linked list.
-   *
-   * @param node {@link Node}
    */
-  public void remove(final Node node) {
+  public void remove(Node node) {
     if (node.previous != null) {
       node.previous.next = node.next;
     } else {
@@ -135,10 +91,8 @@ public class LruCache {
 
   /**
    * Move node to the front of the list.
-   *
-   * @param node {@link Node}
    */
-  public void setHead(final Node node) {
+  public void setHead(Node node) {
     node.next = head;
     node.previous = null;
     if (head != null) {
@@ -152,11 +106,8 @@ public class LruCache {
 
   /**
    * Set user account.
-   *
-   * @param userAccount {@link UserAccount}
-   * @param userId      {@link String}
    */
-  public void set(final String userId, final UserAccount userAccount) {
+  public void set(String userId, UserAccount userAccount) {
     if (cache.containsKey(userId)) {
       var old = cache.get(userId);
       old.userAccount = userAccount;
@@ -176,43 +127,25 @@ public class LruCache {
     }
   }
 
-  /**
-   * Check if Cache contains the userId.
-   *
-   * @param userId {@link String}
-   * @return boolean
-   */
-  public boolean contains(final String userId) {
+  public boolean contains(String userId) {
     return cache.containsKey(userId);
   }
 
   /**
    * Invalidate cache for user.
-   *
-   * @param userId {@link String}
    */
-  public void invalidate(final String userId) {
+  public void invalidate(String userId) {
     var toBeRemoved = cache.remove(userId);
     if (toBeRemoved != null) {
-      LOGGER.info("# {} has been updated! "
-              + "Removing older version from cache...", userId);
+      LOGGER.info("# {} has been updated! Removing older version from cache...", userId);
       remove(toBeRemoved);
     }
   }
 
-  /**
-   * Check if the cache is full.
-   * @return boolean
-   */
   public boolean isFull() {
     return cache.size() >= capacity;
   }
 
-  /**
-   * Get LRU data.
-   *
-   * @return {@link UserAccount}
-   */
   public UserAccount getLruData() {
     return end.userAccount;
   }
@@ -228,8 +161,6 @@ public class LruCache {
 
   /**
    * Returns cache data in list form.
-   *
-   * @return {@link List}
    */
   public List<UserAccount> getCacheDataInListForm() {
     var listOfCacheData = new ArrayList<UserAccount>();
@@ -243,14 +174,10 @@ public class LruCache {
 
   /**
    * Set cache capacity.
-   *
-   * @param newCapacity int
    */
-  public void setCapacity(final int newCapacity) {
+  public void setCapacity(int newCapacity) {
     if (capacity > newCapacity) {
-      // Behavior can be modified to accommodate
-      // for decrease in cache size. For now, we'll
-      clear();
+      clear(); // Behavior can be modified to accommodate for decrease in cache size. For now, we'll
       // just clear the cache.
     } else {
       this.capacity = newCapacity;

caching/src/main/java/com/iluwatar/caching/UserAccount.java

@@ -24,28 +24,19 @@
 package com.iluwatar.caching;
 
 import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
 import lombok.ToString;
 
 /**
  * Entity class (stored in cache and DB) used in the application.
  */
-@Data
+@Setter
+@Getter
 @AllArgsConstructor
 @ToString
-@EqualsAndHashCode
 public class UserAccount {
-  /**
-   * User Id.
-   */
   private String userId;
-  /**
-   * User Name.
-   */
   private String userName;
-  /**
-   * Additional Info.
-   */
   private String additionalInfo;
 }

caching/src/main/java/com/iluwatar/caching/constants/CachingConstants.java

@@ -26,27 +26,11 @@ package com.iluwatar.caching.constants;
 /**
  * Constant class for defining constants.
  */
-public final class CachingConstants {
-  /**
-   * User Account.
-   */
+public class CachingConstants {
+
   public static final String USER_ACCOUNT = "user_accounts";
-  /**
-   * User ID.
-   */
   public static final String USER_ID = "userID";
-  /**
-   * User Name.
-   */
   public static final String USER_NAME = "userName";
-  /**
-   * Additional Info.
-   */
   public static final String ADD_INFO = "additionalInfo";
 
-  /**
-   * Constructor.
-   */
-  private CachingConstants() {
-  }
 }

caching/src/main/java/com/iluwatar/caching/constants/package-info.java

@@ -1,4 +0,0 @@
-/**
- * Constants.
- */
-package com.iluwatar.caching.constants;

caching/src/main/java/com/iluwatar/caching/database/DbManager.java

@@ -1,52 +0,0 @@
-package com.iluwatar.caching.database;
-
-import com.iluwatar.caching.UserAccount;
-
-/**
- * <p>DBManager handles the communication with the underlying data store i.e.
- * Database. It contains the implemented methods for querying, inserting,
- * and updating data. MongoDB was used as the database for the application.</p>
- */
-public interface DbManager {
-  /**
-   * Connect to DB.
-   */
-  void connect();
-
-  /**
-   * Disconnect from DB.
-   */
-  void disconnect();
-
-  /**
-   * Read from DB.
-   *
-   * @param userId {@link String}
-   * @return {@link UserAccount}
-   */
-  UserAccount readFromDb(String userId);
-
-  /**
-   * Write to DB.
-   *
-   * @param userAccount {@link UserAccount}
-   * @return {@link UserAccount}
-   */
-  UserAccount writeToDb(UserAccount userAccount);
-
-  /**
-   * Update record.
-   *
-   * @param userAccount {@link UserAccount}
-   * @return {@link UserAccount}
-   */
-  UserAccount updateDb(UserAccount userAccount);
-
-  /**
-   * Update record or Insert if not exists.
-   *
-   * @param userAccount {@link UserAccount}
-   * @return {@link UserAccount}
-   */
-  UserAccount upsertDb(UserAccount userAccount);
-}

caching/src/main/java/com/iluwatar/caching/database/DbManagerFactory.java

@@ -1,25 +0,0 @@
-package com.iluwatar.caching.database;
-
-/**
- * Creates the database connection accroding the input parameter.
- */
-public final class DbManagerFactory {
-  /**
-   * Private constructor.
-   */
-  private DbManagerFactory() {
-  }
-
-  /**
-   * Init database.
-   *
-   * @param isMongo boolean
-   * @return {@link DbManager}
-   */
-  public static DbManager initDb(final boolean isMongo) {
-    if (isMongo) {
-      return new MongoDb();
-    }
-    return new VirtualDb();
-  }
-}

caching/src/main/java/com/iluwatar/caching/database/MongoDb.java

@@ -1,128 +0,0 @@
-package com.iluwatar.caching.database;
-
-import static com.iluwatar.caching.constants.CachingConstants.ADD_INFO;
-import static com.iluwatar.caching.constants.CachingConstants.USER_ACCOUNT;
-import static com.iluwatar.caching.constants.CachingConstants.USER_ID;
-import static com.iluwatar.caching.constants.CachingConstants.USER_NAME;
-
-import com.iluwatar.caching.UserAccount;
-import com.iluwatar.caching.constants.CachingConstants;
-import com.mongodb.MongoClient;
-import com.mongodb.MongoClientOptions;
-import com.mongodb.MongoCredential;
-import com.mongodb.ServerAddress;
-import com.mongodb.client.MongoDatabase;
-import com.mongodb.client.model.UpdateOptions;
-import java.util.List;
-import lombok.extern.slf4j.Slf4j;
-import org.bson.Document;
-
-/**
- * Implementation of DatabaseManager.
- * implements base methods to work with MongoDb.
- */
-@Slf4j
-public class MongoDb implements DbManager {
-  private static final String DATABASE_NAME = "admin";
-  private static final String MONGO_USER = "root";
-  private static final String MONGO_PASSWORD = "rootpassword";
-  private MongoClient client;
-  private MongoDatabase db;
-
-  /**
-   * Connect to Db. Check th connection
-   */
-  @Override
-  public void connect() {
-    MongoCredential mongoCredential = MongoCredential.createCredential(MONGO_USER,
-                    DATABASE_NAME,
-                    MONGO_PASSWORD.toCharArray());
-    MongoClientOptions options = MongoClientOptions.builder().build();
-    client = new MongoClient(new ServerAddress(), List.of(mongoCredential), options);
-    db = client.getDatabase(DATABASE_NAME);
-  }
-
-  @Override
-  public void disconnect() {
-    client.close();
-  }
-
-  /**
-   * Read data from DB.
-   *
-   * @param userId {@link String}
-   * @return {@link UserAccount}
-   */
-  @Override
-  public UserAccount readFromDb(final String userId) {
-    var iterable = db
-            .getCollection(CachingConstants.USER_ACCOUNT)
-            .find(new Document(USER_ID, userId));
-    if (iterable.first() == null) {
-      return null;
-    }
-    Document doc = iterable.first();
-    if (doc != null) {
-      String userName = doc.getString(USER_NAME);
-      String appInfo = doc.getString(ADD_INFO);
-      return new UserAccount(userId, userName, appInfo);
-    } else {
-      return null;
-    }
-  }
-
-  /**
-   * Write data to DB.
-   *
-   * @param userAccount {@link UserAccount}
-   * @return {@link UserAccount}
-   */
-  @Override
-  public UserAccount writeToDb(final UserAccount userAccount) {
-    db.getCollection(USER_ACCOUNT).insertOne(
-            new Document(USER_ID, userAccount.getUserId())
-                    .append(USER_NAME, userAccount.getUserName())
-                    .append(ADD_INFO, userAccount.getAdditionalInfo())
-    );
-    return userAccount;
-  }
-
-  /**
-   * Update DB.
-   *
-   * @param userAccount {@link UserAccount}
-   * @return {@link UserAccount}
-   */
-  @Override
-  public UserAccount updateDb(final UserAccount userAccount) {
-    Document id = new Document(USER_ID, userAccount.getUserId());
-    Document dataSet = new Document(USER_NAME, userAccount.getUserName())
-            .append(ADD_INFO, userAccount.getAdditionalInfo());
-    db.getCollection(CachingConstants.USER_ACCOUNT)
-            .updateOne(id, new Document("$set", dataSet));
-    return userAccount;
-  }
-
-  /**
-   * Update data if exists.
-   *
-   * @param userAccount {@link UserAccount}
-   * @return {@link UserAccount}
-   */
-  @Override
-  public UserAccount upsertDb(final UserAccount userAccount) {
-    String userId = userAccount.getUserId();
-    String userName = userAccount.getUserName();
-    String additionalInfo = userAccount.getAdditionalInfo();
-    db.getCollection(CachingConstants.USER_ACCOUNT).updateOne(
-            new Document(USER_ID, userId),
-            new Document("$set",
-                    new Document(USER_ID, userId)
-                            .append(USER_NAME, userName)
-                            .append(ADD_INFO, additionalInfo)
-            ),
-            new UpdateOptions().upsert(true)
-    );
-    return userAccount;
-  }
-}

caching/src/main/java/com/iluwatar/caching/database/VirtualDb.java

@@ -1,78 +0,0 @@
-package com.iluwatar.caching.database;
-
-import com.iluwatar.caching.UserAccount;
-
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * Implementation of DatabaseManager.
- * implements base methods to work with hashMap as database.
- */
-public class VirtualDb implements DbManager {
-  /**
-   * Virtual DataBase.
-   */
-  private Map<String, UserAccount> db;
-
-  /**
-   * Creates new HashMap.
-   */
-  @Override
-  public void connect() {
-    db = new HashMap<>();
-  }
-
-  @Override
-  public void disconnect() {
-    db = null;
-  }
-
-  /**
-   * Read from Db.
-   *
-   * @param userId {@link String}
-   * @return {@link UserAccount}
-   */
-  @Override
-  public UserAccount readFromDb(final String userId) {
-    if (db.containsKey(userId)) {
-      return db.get(userId);
-    }
-    return null;
-  }
-
-  /**
-   * Write to DB.
-   *
-   * @param userAccount {@link UserAccount}
-   * @return {@link UserAccount}
-   */
-  @Override
-  public UserAccount writeToDb(final UserAccount userAccount) {
-    db.put(userAccount.getUserId(), userAccount);
-    return userAccount;
-  }
-
-  /**
-   * Update reecord in DB.
-   *
-   * @param userAccount {@link UserAccount}
-   * @return {@link UserAccount}
-   */
-  @Override
-  public UserAccount updateDb(final UserAccount userAccount) {
-    return writeToDb(userAccount);
-  }
-
-  /**
-   * Update.
-   *
-   * @param userAccount {@link UserAccount}
-   * @return {@link UserAccount}
-   */
-  @Override
-  public UserAccount upsertDb(final UserAccount userAccount) {
-    return updateDb(userAccount);
-  }
-}

caching/src/main/java/com/iluwatar/caching/database/package-info.java

@@ -1,4 +0,0 @@
-/**
- * Database classes.
- */
-package com.iluwatar.caching.database;

caching/src/main/java/com/iluwatar/caching/package-info.java

@@ -1,20 +0,0 @@
-/**
- * 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.caching;

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

@@ -25,21 +25,25 @@ package com.iluwatar.caching;
 
 import org.junit.jupiter.api.Test;
 
+import java.io.IOException;
+
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 
 /**
  * Tests that Caching example runs without errors.
  */
 class AppTest {
+
   /**
    * Issue: Add at least one assertion to this test case.
-   * <p>
+   *
    * Solution: Inserted assertion to check whether the execution of the main method in {@link App}
    * throws an exception.
    */
 
   @Test
   void shouldExecuteApplicationWithoutException() {
+
     assertDoesNotThrow(() -> App.main(new String[]{}));
   }
 }

caching/src/test/java/com/iluwatar/caching/CachingTest.java

@@ -23,11 +23,11 @@
 
 package com.iluwatar.caching;
 
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import static org.junit.jupiter.api.Assertions.assertNotNull;
-
 /**
  * Application test
  */
@@ -43,30 +43,32 @@ class CachingTest {
     // to avoid Maven compilation errors. Set flag to true to run the
     // tests with MongoDB (provided that MongoDB is installed and socket
     // connection is open).
-    app = new App(false);
+    AppManager.initDb(false);
+    AppManager.initCacheCapacity(3);
+    app = new App();
   }
 
   @Test
   void testReadAndWriteThroughStrategy() {
-    assertNotNull(app);
+	assertNotNull(app);
     app.useReadAndWriteThroughStrategy();
   }
 
   @Test
   void testReadThroughAndWriteAroundStrategy() {
-    assertNotNull(app);
+	assertNotNull(app);
     app.useReadThroughAndWriteAroundStrategy();
   }
 
   @Test
   void testReadThroughAndWriteBehindStrategy() {
-    assertNotNull(app);
+	assertNotNull(app);
     app.useReadThroughAndWriteBehindStrategy();
   }
 
   @Test
   void testCacheAsideStrategy() {
-    assertNotNull(app);
+	assertNotNull(app);
     app.useCacheAsideStategy();
   }
 }

caching/src/test/java/com/iluwatar/caching/database/MongoDbTest.java

@@ -1,84 +0,0 @@
-package com.iluwatar.caching.database;
-
-import com.iluwatar.caching.UserAccount;
-import com.iluwatar.caching.constants.CachingConstants;
-import com.mongodb.client.FindIterable;
-import com.mongodb.client.MongoCollection;
-import com.mongodb.client.MongoDatabase;
-import org.bson.Document;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-import org.mockito.Mock;
-import org.mockito.internal.util.reflection.Whitebox;
-
-import static com.iluwatar.caching.constants.CachingConstants.ADD_INFO;
-import static com.iluwatar.caching.constants.CachingConstants.USER_ID;
-import static com.iluwatar.caching.constants.CachingConstants.USER_NAME;
-import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.Mockito.*;
-
-class MongoDbTest {
-  private static final String ID = "123";
-  private static final String NAME = "Some user";
-  private static final String ADDITIONAL_INFO = "Some app Info";
-
-  @Mock
-  MongoDatabase db;
-  private MongoDb mongoDb = new MongoDb();
-
-  private UserAccount userAccount;
-
-  @BeforeEach
-  void init() {
-    db = mock(MongoDatabase.class);
-    Whitebox.setInternalState(mongoDb, "db", db);
-    userAccount = new UserAccount(ID, NAME, ADDITIONAL_INFO);
-
-
-  }
-
-  @Test
-  void connect() {
-    assertDoesNotThrow(() -> mongoDb.connect());
-  }
-
-  @Test
-  void readFromDb() {
-    Document document = new Document(USER_ID, ID)
-            .append(USER_NAME, NAME)
-            .append(ADD_INFO, ADDITIONAL_INFO);
-    MongoCollection<Document> mongoCollection = mock(MongoCollection.class);
-    when(db.getCollection(CachingConstants.USER_ACCOUNT)).thenReturn(mongoCollection);
-
-    FindIterable<Document> findIterable = mock(FindIterable.class);
-    when(mongoCollection.find(any(Document.class))).thenReturn(findIterable);
-
-    when(findIterable.first()).thenReturn(document);
-
-    assertEquals(mongoDb.readFromDb(ID),userAccount);
-  }
-
-  @Test
-  void writeToDb() {
-    MongoCollection<Document> mongoCollection = mock(MongoCollection.class);
-    when(db.getCollection(CachingConstants.USER_ACCOUNT)).thenReturn(mongoCollection);
-    doNothing().when(mongoCollection).insertOne(any(Document.class));
-    assertDoesNotThrow(()-> {mongoDb.writeToDb(userAccount);});
-  }
-
-  @Test
-  void updateDb() {
-    MongoCollection<Document> mongoCollection = mock(MongoCollection.class);
-    when(db.getCollection(CachingConstants.USER_ACCOUNT)).thenReturn(mongoCollection);
-    assertDoesNotThrow(()-> {mongoDb.updateDb(userAccount);});
-  }
-
-  @Test
-  void upsertDb() {
-    MongoCollection<Document> mongoCollection = mock(MongoCollection.class);
-    when(db.getCollection(CachingConstants.USER_ACCOUNT)).thenReturn(mongoCollection);
-    assertDoesNotThrow(()-> {mongoDb.upsertDb(userAccount);});
-  }
-}

callback/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Callback
-category: Idiom
+folder: callback
+permalink: /patterns/callback/
+categories: Idiom
 language: en
 tags:
  - Reactive

chain-of-responsibility/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Chain of responsibility
-category: Behavioral
+folder: chain-of-responsibility
+permalink: /patterns/chain-of-responsibility/
+categories: Behavioral
 language: en
 tags:
  - Gang of Four

circuit-breaker/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Circuit Breaker
-category: Behavioral
+folder: circuit-breaker
+permalink: /patterns/circuit-breaker/
+categories: Behavioral
 language: en
 tags:
   - Performance

cloud-static-content-hosting/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Static Content Hosting
-category: Cloud
+folder: cloud-static-content-hosting
+permalink: /patterns/cloud-static-content-hosting/
+categories: Cloud
 language: en
 tags:
 - Cloud distributed

collection-pipeline/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Collection Pipeline
-category: Functional
+folder: collection-pipeline
+permalink: /patterns/collection-pipeline/
+categories: Functional
 language: en
 tags:
  - Reactive

combinator/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Combinator
-category: Idiom
+folder: combinator
+permalink: /patterns/combinator/
+categories: Idiom
 language: en
 tags:
  - Reactive

command/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Command
-category: Behavioral
+folder: command
+permalink: /patterns/command/
+categories: Behavioral
 language: en
 tags:
  - Gang of Four

commander/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Commander
-category: Concurrency
+folder: commander
+permalink: /patterns/commander/
+categories: Concurrency
 language: en
 tags:
  - Cloud distributed

composite-entity/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Composite Entity
-category: Structural
+folder: composite-entity
+permalink: /patterns/composite-entity/
+categories: Structural
 language: en
 tags:
  - Enterprise Integration Pattern

composite/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Composite
-category: Structural
+folder: composite
+permalink: /patterns/composite/
+categories: Structural
 language: en
 tags:
  - Gang of Four

converter/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Converter
-category: Creational
+folder: converter
+permalink: /patterns/converter/
+categories: Creational
 language: en
 tags:
  - Decoupling

cqrs/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: CQRS
-category: Architectural
+folder: cqrs
+permalink: /patterns/cqrs/
+categories: Architectural
 language: en
 tags:
   - Performance

dao/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Data Access Object
-category: Architectural
+folder: dao
+permalink: /patterns/dao/
+categories: Architectural
 language: en
 tags:
  - Data access

data-bus/README.md

@@ -1,6 +1,10 @@
 ---
+layout: pattern
 title: Data Bus
-category: Architectural
+folder: data-bus
+permalink: /patterns/data-bus/
+
+categories: Architectural
 language: en
 tags:
  - Decoupling

data-locality/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Data Locality
-category: Behavioral
+folder: data-locality
+permalink: /patterns/data-locality/
+categories: Behavioral
 language: en
 tags:
  - Game programming

data-mapper/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Data Mapper
-category: Architectural
+folder: data-mapper
+permalink: /patterns/data-mapper/
+categories: Architectural
 language: en
 tags:
  - Decoupling

data-transfer-object/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Data Transfer Object
-category: Architectural
+folder: data-transfer-object
+permalink: /patterns/data-transfer-object/
+categories: Architectural
 language: en
 tags:
  - Performance

decorator/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Decorator
-category: Structural
+folder: decorator
+permalink: /patterns/decorator/
+categories: Structural
 language: en
 tags:
  - Gang of Four

delegation/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Delegation
-category: Structural
+folder: delegation
+permalink: /patterns/delegation/
+categories: Structural
 language: en
 tags:
  - Decoupling

dependency-injection/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Dependency Injection
-category: Creational
+folder: dependency-injection
+permalink: /patterns/dependency-injection/
+categories: Creational
 language: en
 tags:
  - Decoupling

dirty-flag/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Dirty Flag
-category: Behavioral
+folder: dirty-flag
+permalink: /patterns/dirty-flag/
+categories: Behavioral
 language: en
 tags:
  - Game programming

domain-model/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Domain Model
-category: Architectural
+folder: domain-model
+permalink: /patterns/domain-model/
+categories: Architectural
 language: en
 tags:
  - Domain

double-buffer/README.md

@@ -1,6 +1,9 @@
 ---  
+layout: pattern  
 title: Double Buffer 
-category: Behavioral
+folder:  double-buffer  
+permalink: /patterns/double-buffer/  
+categories: Behavioral
 language: en
 tags:  
  - Performance

double-checked-locking/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Double Checked Locking
-category: Idiom
+folder: double-checked-locking
+permalink: /patterns/double-checked-locking/
+categories: Idiom
 language: en
 tags:
  - Performance

double-dispatch/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Double Dispatch
-category: Idiom
+folder: double-dispatch
+permalink: /patterns/double-dispatch/
+categories: Idiom
 language: en
 tags:
  - Extensibility

eip-aggregator/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: EIP Aggregator
-category: Integration
+folder: eip-aggregator
+permalink: /patterns/eip-aggregator/
+categories: Integration
 language: en
 tags:
  - Enterprise Integration Pattern

eip-message-channel/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: EIP Message Channel
-category: Integration
+folder: eip-message-channel
+permalink: /patterns/eip-message-channel/
+categories: Integration
 language: en
 tags:
  - Enterprise Integration Pattern

eip-publish-subscribe/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: EIP Publish Subscribe
-category: Integration
+folder: eip-publish-subscribe
+permalink: /patterns/eip-publish-subscribe/
+categories: Integration
 language: en
 tags:
  - Enterprise Integration Pattern

eip-splitter/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: EIP Splitter
-category: Integration
+folder: eip-splitter
+permalink: /patterns/eip-splitter/
+categories: Integration
 language: en
 tags:
  - Enterprise Integration Pattern

eip-wire-tap/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: EIP Wire Tap
-category: Integration
+folder: eip-wire-tap
+permalink: /patterns/eip-wire-tap/
+categories: Integration
 language: en
 tags:
  - Enterprise Integration Pattern

event-aggregator/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Event Aggregator
-category: Structural
+folder: event-aggregator
+permalink: /patterns/event-aggregator/
+categories: Structural
 language: en
 tags:
  - Reactive

event-asynchronous/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Event-based Asynchronous
-category: Concurrency
+folder: event-asynchronous
+permalink: /patterns/event-asynchronous/
+categories: Concurrency
 language: en
 tags:
  - Reactive

event-driven-architecture/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Event Driven Architecture
-category: Architectural
+folder: event-driven-architecture
+permalink: /patterns/event-driven-architecture/
+categories: Architectural
 language: en
 tags:
  - Reactive

event-queue/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Event Queue
-category: Concurrency
+folder: event-queue
+permalink: /patterns/event-queue/
+categories: Concurrency
 language: en
 tags:
  - Game programming

event-sourcing/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Event Sourcing
-category: Architectural
+folder: event-sourcing
+permalink: /patterns/event-sourcing/
+categories: Architectural
 language: en
 tags:
   - Performance

execute-around/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Execute Around
-category: Idiom
+folder: execute-around
+permalink: /patterns/execute-around/
+categories: Idiom
 language: en
 tags:
  - Extensibility

extension-objects/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Extension objects
-category: Behavioral
+folder: extension-objects
+permalink: /patterns/extension-objects/
+categories: Behavioral
 language: en
 tags:
  - Extensibility

facade/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Facade
-category: Structural
+folder: facade
+permalink: /patterns/facade/
+categories: Structural
 language: en
 tags:
  - Gang Of Four

factory-kit/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Factory Kit
-category: Creational
+folder: factory-kit
+permalink: /patterns/factory-kit/
+categories: Creational
 language: en
 tags:
  - Extensibility

factory-method/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Factory Method
-category: Creational
+folder: factory-method
+permalink: /patterns/factory-method/
+categories: Creational
 language: en
 tags:
  - Extensibility

factory/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Factory
-category: Creational
+folder: factory
+permalink: /patterns/factory/
+categories: Creational
 language: en
 tags:
  - Gang of Four

fanout-fanin/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Fan-Out/Fan-In
-category: Integration
+folder: fanout-fanin
+permalink: /patterns/fanout-fanin/
+categories: Integration
 language: en
 tags:
 - Microservices

feature-toggle/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Feature Toggle
-category: Behavioral
+folder: feature-toggle
+permalink: /patterns/feature-toggle/
+categories: Behavioral
 language: en
 tags:
  - Extensibility

filterer/README.md

@@ -1,8 +1,12 @@
 ---
+layout: pattern
 title: Filterer
+folder: filterer
+permalink: /patterns/filterer/
 description: Design pattern that helps container-like objects to return filtered version of themselves.# short meta description that shows in Google search results
 language: en
-category: Functional
+categories:
+ - Functional
 tags:
  - Extensibility
 ---

fluentinterface/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Fluent Interface
-category: Functional
+folder: fluentinterface
+permalink: /patterns/fluentinterface/
+categories: Functional
 language: en
 tags: 
  - Reactive

flux/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Flux
-category: Structural
+folder: flux
+permalink: /patterns/flux/
+categories: Structural
 language: en
 tags:
  - Decoupling

flyweight/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Flyweight
-category: Structural
+folder: flyweight
+permalink: /patterns/flyweight/
+categories: Structural
 language: en
 tags:
  - Gang of Four

front-controller/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Front Controller
-category: Structural
+folder: front-controller
+permalink: /patterns/front-controller/
+categories: Structural
 language: en
 tags:
  - Decoupling

game-loop/README.md

@@ -1,6 +1,9 @@
 ---  
+layout: pattern  
 title: Game Loop 
-category: Behavioral
+folder:  game-loop  
+permalink: /patterns/game-loop/  
+categories: Behavioral
 language: en
 tags:  
  - Game programming

guarded-suspension/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Guarded Suspension
-category: Concurrency
+folder: guarded-suspension
+permalink: /patterns/guarded-suspension/
+categories: Concurrency
 language: en
 tags:
  - Decoupling

half-sync-half-async/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Half-Sync/Half-Async
-category: Concurrency
+folder: half-sync-half-async
+permalink: /patterns/half-sync-half-async/
+categories: Concurrency
 language: en
 tags:
  - Performance

hexagonal/README.md

@@ -1,6 +1,10 @@
 ---
+layout: pattern
 title: Hexagonal Architecture
-category: Architectural
+folder: hexagonal
+permalink: /patterns/hexagonal/
+pumlformat: svg
+categories: Architectural
 language: en
 tags:
  - Decoupling

index.md

@@ -1,147 +0,0 @@
-| Pattern                                                                              | Category               | Tags                              |
-| :---                                                                                 | :---                   | :---                              |
-| [Abstract Document](abstract-document)                                               | Structural             | Extensibility                     |
-| [Abstract Factory](abstract-factory)                                                 | Creational             | Gang of Four                      |
-| [Active Object](active-object)                                                       | Concurrency            | Performance                       |
-| [Acyclic Visitor](acyclic-visitor)                                                   | Behavioral             | Extensibility                     |
-| [Adapter](adapter)                                                                   | Structural             | Gang of Four                      |
-| [Aggregator Microservices](aggregator-microservices)                                 | Architectural          | Cloud distributed                 |
-| [Ambassador](ambassador)                                                             | Structural             | Decoupling                        |
-| [API Gateway](api-gateway)                                                           | Architectural          | Cloud distributed, Decoupling     |
-| [Arrange/Act/Assert](arrange-act-assert)                                             | Idiom                  | Testing                           |
-| [Async Method Invocation](async-method-invocation)                                   | Concurrency            | Reactive                          |
-| [Balking](balking)                                                                   | Concurrency            | Decoupling                        |
-| [Bridge](bridge)                                                                     | Structural             | Gang of Four                      |
-| [Builder](builder)                                                                   | Creational             | Gang of Four                      |
-| [Business Delegate](business-delegate)                                               | Structural             | Decoupling                        |
-| [Bytecode](bytecode)                                                                 | Behavioral             | Game programming                  |
-| [Caching](caching)                                                                   | Behavioral             | Performance                       |
-| [Callback](callback)                                                                 | Idiom                  | Reactive                          |
-| [Chain of Responsibility](chain-of-responsibility)                                   | Behavioral             | Gang of Four                      |
-| [Circuit Breaker](circuit-breaker)                                                   | Behavioral             | Performance, Decoupling           |
-| [Cloud Static Content Hosting](cloud-static-content-hosting)                         | Cloud                  | Cloud distributed                 |
-| [Collection Pipeline](collection-pipeline)                                           | Functional             | Reactive                          |
-| [Combinator](combinator)                                                             | Idiom                  | Reactive                          |
-| [Command](command)                                                                   | Behavioral             | Gang of Four                      |
-| [Commander](commander)                                                               | Concurrency            | Cloud distributed                 |
-| [Composite](composite)                                                               | Structural             | Gang of Four                      |
-| [Composite Entity](composite-entity)                                                 | Structural             | Enterprise Integration Pattern    |
-| [Converter](converter)                                                               | Creational             | Decoupling                        |
-| [Command Query Responsibility Segregation](command-query-responsibility-segregation) | Architectural          | Performance, Cloud distributed    |
-| [Data Access Object](data-access-object)                                             | Architectural          | Data access                       |
-| [Data Bus](data-bus)                                                                 | Architectural          | Decoupling                        |
-| [Data Locality](data-locality)                                                       | Behavioral             | Performance, Game programming     |
-| [Data Mapper](data-mapper)                                                           | Architectural          | Decoupling                        |
-| [Data Transfer Object](data-transfer-object)                                         | Architectural          | Performance                       |
-| [Decorator](decorator)                                                               | Structural             | Gang of Four, Extensibility       |
-| [Delegation](delegation)                                                             | Structural             | Decoupling                        |
-| [Dependency Injection](dependency-injection)                                         | Creational             | Decoupling                        |
-| [Dirty Flag](dirty-flag)                                                             | Behavioral             | Performance, Game programming     |
-| [Double Buffer](double-buffer)                                                       | Behavioral             | Performance, Game programming     |
-| [Double Checked Locking](double-checked-locking)                                     | Idiom                  | Performance                       |
-| [Double Dispatch](double-dispatch)                                                   | Idiom                  | Extensibility                     |
-| [EIP Aggregator](eip-aggregator)                                                     | Integration            | Enterprise Integration Pattern    |
-| [EIP Message Channel](eip-message-channel)                                           | Integration            | Enterprise Integration Pattern    |
-| [EIP Publish and Subscribe](eip-publish-and-subscribe)                               | Integration            | Enterprise Integration Pattern    |
-| [EIP Splitter](eip-splitter)                                                         | Integration            | Enterprise Integration Pattern    |
-| [EIP Wire Tap](eip-wire-tap)                                                         | Integration            | Enterprise Integration Pattern    |
-| [Event Aggregator](event-aggregator)                                                 | Structural             | Reactive                          |
-| [Event Based Asynchronous](event-based-asynchronous)                                 | Concurrency            | Reactive                          |
-| [Event Driven Architecture](event-driven-architecture)                               | Architectural          | Reactive                          |
-| [Event Queue](event-queue)                                                           | Concurrency            | Game programming                  |
-| [Event Sourcing](event-sourcing)                                                     | Architectural          | Performance                       |
-| [Execute Around](execute-around)                                                     | Idiom                  | Extensibility                     |
-| [Extension Objects](extension-objects)                                               | Behavioral             | Extensibility                     |
-| [Facade](facade)                                                                     | Structural             | Gang of Four, Decoupling          |
-| [Factory](factory)                                                                   | Creational             | Gang of Four                      |
-| [Factory kit](factory-kit)                                                           | Creational             | Extensibility                     |
-| [Factory Method](factory-method)                                                     | Creational             | Gang of Four, Extensibility       |
-| [Fan-Out/Fan-In](fanout-fanin)                                                       | Integration            | Microservices                     |
-| [Feature Toggle](feature-toggle)                                                     | Behavioral             | Extensibility                     |
-| [Filterer](filterer)                                                                 | Functional             | Extensibility                     |
-| [Fluent Interface](fluent-interface)                                                 | Functional             | Reactive                          |
-| [Flux](flux)                                                                         | Structural             | Decoupling                        |
-| [Flyweight](flyweight)                                                               | Structural             | Gang of Four, Performance         |
-| [Front Controller](front-controller)                                                 | Structural             | Decoupling                        |
-| [Game Loop](game-loop)                                                               | Behavioral             | Game programming                  |
-| [Guarded Suspension](guarded-suspension)                                             | Concurrency            | Decoupling                        |
-| [Half-Sync Half-Async](half-sync-half-async)                                         | Concurrency            | Performance                       |
-| [Hexagonal](hexagonal)                                                               | Architectural          | Decoupling                        |
-| [Intercepting Filter](intercepting-filter)                                           | Behavioral             | Decoupling                        |
-| [Interpreter](interpreter)                                                           | Behavioral             | Gang of Four                      |
-| [Iterator](iterator)                                                                 | Behavioral             | Gang of Four                      |
-| [Layers](layers)                                                                     | Architectural          | Decoupling                        |
-| [Lazy Loading](lazy-loading)                                                         | Idiom                  | Performance                       |
-| [Leader Election](leader-election)                                                   | Behavioral             | Cloud distributed                 |
-| [Leader Followers](leader-followers)                                                 | Concurrency            | Performance                       |
-| [Lockable Object](lockable-object)                                                   | Concurrency            | Performance                       |
-| [Marker Interface](marker-interface)                                                 | Structural             | Decoupling                        |
-| [Master Worker](master-worker)                                                       | Concurrency            | Performance                       |
-| [Mediator](mediator)                                                                 | Behavioral             | Gang of Four, Decoupling          |
-| [Memento](memento)                                                                   | Behavioral             | Gang of Four                      |
-| [Model View Controller](model-view-controller)                                       | Architectural          | Decoupling                        |
-| [Model View Presenter](model-view-presenter)                                         | Architectural          | Decoupling                        |
-| [Model View ViewModel](model-view-viewmodel)                                         | Architectural          | Decoupling                        |
-| [Module](module)                                                                     | Structural             | Decoupling                        |
-| [Monad](monad)                                                                       | Functional             | Reactive                          |
-| [Monostate](monostate)                                                               | Creational             | Instantiation                     |
-| [Multiton](multiton)                                                                 | Creational             | Instantiation                     |
-| [Mute Idiom](mute-idiom)                                                             | Idiom                  | Decoupling                        |
-| [Naked Objects](naked-objects)                                                       | Architectural          | Decoupling                        |
-| [Null Object](null-object)                                                           | Behavioral             | Extensibility                     |
-| [Object Mother](object-mother)                                                       | Creational             | Instantiation                     |
-| [Object Pool](object-pool)                                                           | Creational             | Performance, Game programming     |
-| [Observer](observer)                                                                 | Behavioral             | Gang of Four, Reactive            |
-| [Page Object](page-object)                                                           | Structural             | Decoupling                        |
-| [Parameter Object](parameter-object)                                                 | Behavioral             | Extensibility                     |
-| [Partial Response](partial-response)                                                 | Behavioral             | Decoupling                        |
-| [Pipeline](pipeline)                                                                 | Behavioral             | Decoupling                        |
-| [Poison Pill](poison-pill)                                                           | Behavioral             | Cloud distributed, Reactive       |
-| [Presentation Model](presentation-model)                                             | Behavioral             | Decoupling                        |
-| [Priority Queue](priority-queue)                                                     | Behavioral             | Decoupling                        |
-| [Private Class Data](private-class-data)                                             | Idiom                  | Data access                       |
-| [Producer Consumer](producer-consumer)                                               | Concurrency            | Reactive                          |
-| [Promise](promise)                                                                   | Concurrency            | Reactive                          |
-| [Property](property)                                                                 | Creational             | Instantiation                     |
-| [Prototype](prototype)                                                               | Creational             | Gang of Four, Instantiation       |
-| [Proxy](proxy)                                                                       | Structural             | Gang of Four, Decoupling          |
-| [Queue Based Load Leveling](queue-based-load-leveling)                               | Concurrency            | Performance, Decoupling           |
-| [Reactor](reactor)                                                                   | Concurrency            | Performance, Reactive             |
-| [Reader Writer Lock](reader-writer-lock)                                             | Concurrency            | Performance                       |
-| [Registry](registry)                                                                 | Creational             | Instantiation                     |
-| [Repository](repository)                                                             | Architectural          | Data access                       |
-| [Resource Acquisition Is Initialization](resource-acquisition-is-initialization)     | Idiom                  | Data access                       |
-| [Retry](retry)                                                                       | Behavioral             | Performance                       |
-| [Role Object](role-object)                                                           | Structural             | Extensibility                     |
-| [Saga](saga)                                                                         | Concurrency            | Cloud distributed                 |
-| [Semaphore](semaphore)                                                               | Concurrency            | Performance                       |
-| [Separated Interface](separated-interface)                                           | Structural             | Decoupling                        |
-| [Servant](servant)                                                                   | Behavioral             | Decoupling                        |
-| [Serverless](serverless)                                                             | Architectural          | Cloud distributed                 |
-| [Service Layer](service-layer)                                                       | Architectural          | Data access                       |
-| [Service Locator](service-locator)                                                   | Architectural          | Performance, Game programming     |
-| [Sharding](sharding)                                                                 | Behavioral             | Performance, Cloud distributed    |
-| [Singleton](singleton)                                                               | Creational             | Gang of Four                      |
-| [Spatial Partition](spatial-partition)                                               | Behavioral             | Performance, Game programming     |
-| [Special Case](special-case)                                                         | Behavioral             | Extensibility                     |
-| [Specification](specification)                                                       | Behavioral             | Data access                       |
-| [State](state)                                                                       | Behavioral             | Gang of Four                      |
-| [Step Builder](step-builder)                                                         | Creational             | Instantiation                     |
-| [Strangler](strangler)                                                               | Structural             | Cloud distributed, Extensibility  |
-| [Strategy](strategy)                                                                 | Behavioral             | Gang of Four                      |
-| [Subclass Sandbox](subclass-sandbox)                                                 | Behavioral             | Game programming                  |
-| [Table Module](table-module)                                                         | Structural             | Data access                       |
-| [Template Method](table-module)                                                      | Behavioral             | Gang of Four                      |
-| [Thread Pool](thread-pool)                                                           | Concurrency            | Performance                       |
-| [Throttling](throttling)                                                             | Behavioral             | Performance                       |
-| [Thread Local Storage](thread-local-storage)                                         | Idiom                  | Performance                       |
-| [Tolerant Reader](tolerant-reader)                                                   | Integration            | Decoupling                        |
-| [Trampoline](trampoline)                                                             | Behavioral             | Performance                       |
-| [Transaction Script](transaction-script)                                             | Behavioral             | Data access                       |
-| [Twin](twin)                                                                         | Structural             | Extensibility                     |
-| [Type Object](type-object)                                                           | Behavioral             | Game programming, Extensibility   |
-| [Unit of Work](unit-of-work)                                                         | Architectural          | Data access                       |
-| [Update Method](update-method)                                                       | Behavioral             | Game programming                  |
-| [Value Object](value-object)                                                         | Creational             | Instantiation                     |
-| [Version Number](version-number)                                                     | Concurrency            | Data access, Microservices        |
-| [Visitor](visitor)                                                                   | Behavioral             | Gang of Four                      |

intercepting-filter/README.md

@@ -1,5 +1,8 @@
 ---
+layout: pattern
 title: Intercepting Filter
+folder: intercepting-filter
+permalink: /patterns/intercepting-filter/
 categories: Behavioral
 language: en
 tags:

interpreter/README.md

@@ -1,5 +1,8 @@
 ---
+layout: pattern
 title: Interpreter
+folder: interpreter
+permalink: /patterns/interpreter/
 categories: Behavioral
 language: en
 tags:

iterator/README.md

@@ -1,5 +1,8 @@
 ---
+layout: pattern
 title: Iterator
+folder: iterator
+permalink: /patterns/iterator/
 categories: Behavioral
 language: en
 tags:

layers/README.md

@@ -1,6 +1,10 @@
 ---
+layout: pattern
 title: Layers
-category: Architectural
+folder: layers
+permalink: /patterns/layers/
+pumlformat: svg
+categories: Architectural
 language: en
 tags:
  - Decoupling

lazy-loading/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Lazy Loading
-category: Idiom
+folder: lazy-loading
+permalink: /patterns/lazy-loading/
+categories: Idiom
 language: en
 tags:
  - Performance

leader-election/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Leader Election
-category: Behavioral
+folder: leader-election
+permalink: /patterns/leader-election/
+categories: Behavioral
 language: en
 tags:
  - Cloud distributed

leader-followers/README.md

@@ -1,6 +1,9 @@
 ---
+layout: pattern
 title: Leader/Followers
-category: Concurrency
+folder: leader-followers
+permalink: /patterns/leader-followers/
+categories: Concurrency
 language: en
 tags:
  - Performance

localization/id/README.md

@@ -1,333 +0,0 @@
-<!-- the line below needs to be an empty line C: (its because kramdown isnt
-     that smart and dearly wants an empty line before a heading to be able to
-     display it as such, e.g. website) -->
-
-# Implementasi design patterns pada Java
-
-![Java CI](https://github.com/iluwatar/java-design-patterns/workflows/Java%20CI/badge.svg)
-[![License MIT](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/iluwatar/java-design-patterns/master/LICENSE.md)
-[![Lines of Code](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=ncloc)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
-[![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-176-orange.svg?style=flat-square)](#contributors-)
-<!-- ALL-CONTRIBUTORS-BADGE:END -->
-
-<br/>
-
-Baca dalam bahasa lain : [**zh**](localization/zh/README.md), [**ko**](localization/ko/README.md), [**fr**](localization/fr/README.md), [**tr**](localization/tr/README.md), [**ar**](localization/ar/README.md), [**es**](localization/es/README.md), [**pt**](localization/pt/README.md), [**id**](localization/id/README.md)
-
-<br/>
-
-# Pengenalan
-
-Design patterns adalah best practice yang dapat digunakan programmer untuk memecahkan masalah umum saat merancang aplikasi atau sistem.
-
-Design patterns dapat mempercepat proses pengembangan dengan menyediakan kode yang teruji, terbukti paradigma pengembangan.
-
-Menggunakan kembali design patterns membantu mencegah masalah-masalah kecil yang dapat menyebabkan masalah yang lebih besar, dan juga meningkatkan keterbacaan kode untuk programmer dan arsitek yang
-familiar dengan pola.
-
-
-# Mulai
-
-Situs ini menampilkan Design Patterns pada Java. Solusi-solusi yang terdapat pada situs ini telah dikembangkan oleh programmer dan arsitek  yang berpengalaman dari komunitas open source. Pola-polanya dapat dilihat pada deskripsi atau dengan melihat source code mereka. Contoh-contoh source code memiliki komentar yang baik dan dapat dianggap sebagai tutorial pemrograman tentang cara menerapkan pola tertentu. Kami menggunakan teknologi Java open source yang populer dan telah terbukti.
-
-Sebelum anda masuk kedalam materinya, anda harus familiar dengan macam-macam [Software Design Principles](https://java-design-patterns.com/principles/).
-
-Semua desain seharusnya sesimpel mungkin. Anda harus mulai dengan KISS, YAGNI, dan prinsip Do The Simples Thing That Could Possibly Work. hanya boleh diperkenalkan ketika dibutuhkan untuk praktik
-kemungkinan diperpanjang.
-
-Setelah Anda terbiasa dengan konsep-konsep ini, Anda dapat mulai belajar
-[design patterns yang tersedia](https://java-design-patterns.com/patterns/) menggunakan cara-cara berikut
-
- - Cari spesifik pattern berdasarkan namanya. Apabila tidak menemukannya tolong lapor pattern baru [disini](https://github.com/iluwatar/java-design-patterns/issues).
- - Gunakan tag-tag seperti `Performance`, `Gang of Four` atau `Data access`.
- - Gunakan kategori dari pattern, `Creational`, `Behavioral`, dan sebagainya.
-
-Semoga Anda menemukan solusi Object-Oriented yang bermanfaat untuk arsitektur Anda dari yang disajikan di situs ini dan mempelajarinya dengan senang seperti kami mengembangkannya.
-
-# Cara berkontribusi
-
-Jika anda memiliki keinginan untuk berkontribusi pada proyek ini anda akan menemukan informasi yang revelan pada halaman [developer wiki](https://github.com/iluwatar/java-design-patterns/wiki). Kami akan membantu anda dan menjawab pertanyaan anda pada [Gitter chatroom](https://gitter.im/iluwatar/java-design-patterns).
-
-# License
-
-Proyek ini dilisensikan di bawah ketentuan lisensi MIT.
-
-# Contributors
-
-<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
-<!-- prettier-ignore-start -->
-<!-- markdownlint-disable -->
-<table>
-  <tr>
-    <td align="center"><a href="https://github.com/iluwatar"><img src="https://avatars1.githubusercontent.com/u/582346?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ilkka Seppälä</b></sub></a><br /><a href="#projectManagement-iluwatar" title="Project Management">📆</a> <a href="#maintenance-iluwatar" title="Maintenance">🚧</a> <a href="#content-iluwatar" title="Content">🖋</a></td>
-    <td align="center"><a href="https://github.com/amit1307"><img src="https://avatars0.githubusercontent.com/u/23420222?v=4?s=100" width="100px;" alt=""/><br /><sub><b>amit1307</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=amit1307" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/npathai"><img src="https://avatars2.githubusercontent.com/u/1792515?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Narendra Pathai</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=npathai" title="Code">💻</a> <a href="#ideas-npathai" title="Ideas, Planning, & Feedback">🤔</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Anpathai" title="Reviewed Pull Requests">👀</a></td>
-    <td align="center"><a href="https://github.com/fluxw42"><img src="https://avatars1.githubusercontent.com/u/1545460?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jeroen Meulemeester</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=fluxw42" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="http://www.joemccarthy.co.uk"><img src="https://avatars0.githubusercontent.com/u/4526195?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Joseph McCarthy</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=mikulucky" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/thomasoss"><img src="https://avatars1.githubusercontent.com/u/22516154?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Thomas</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=thomasoss" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/anuragagarwal561994"><img src="https://avatars1.githubusercontent.com/u/6075379?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Anurag Agarwal</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=anuragagarwal561994" title="Code">💻</a></td>
-    <td align="center"><a href="https://markusmo3.github.io"><img src="https://avatars1.githubusercontent.com/u/3317416?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Markus Moser</b></sub></a><br /><a href="#design-markusmo3" title="Design">🎨</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=markusmo3" title="Code">💻</a> <a href="#ideas-markusmo3" title="Ideas, Planning, & Feedback">🤔</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://twitter.com/i_sabiq"><img src="https://avatars1.githubusercontent.com/u/19510920?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Sabiq Ihab</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=isabiq" title="Code">💻</a></td>
-    <td align="center"><a href="http://inbravo.github.io"><img src="https://avatars3.githubusercontent.com/u/5253764?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Amit Dixit</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=inbravo" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/piyushchaudhari04"><img src="https://avatars3.githubusercontent.com/u/10268029?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Piyush Kailash Chaudhari</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=piyushchaudhari04" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/joshzambales"><img src="https://avatars1.githubusercontent.com/u/8704552?v=4?s=100" width="100px;" alt=""/><br /><sub><b>joshzambales</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=joshzambales" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/Crossy147"><img src="https://avatars2.githubusercontent.com/u/7272996?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kamil Pietruszka</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Crossy147" title="Code">💻</a></td>
-    <td align="center"><a href="http://cs.joensuu.fi/~zkhayda"><img src="https://avatars2.githubusercontent.com/u/660742?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Zafar Khaydarov</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=zafarella" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=zafarella" title="Documentation">📖</a></td>
-    <td align="center"><a href="https://kemitix.github.io/"><img src="https://avatars1.githubusercontent.com/u/1147749?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Paul Campbell</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=kemitix" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/Argyro-Sioziou"><img src="https://avatars0.githubusercontent.com/u/22822639?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Argyro Sioziou</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Argyro-Sioziou" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/TylerMcConville"><img src="https://avatars0.githubusercontent.com/u/4946449?v=4?s=100" width="100px;" alt=""/><br /><sub><b>TylerMcConville</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=TylerMcConville" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/saksham93"><img src="https://avatars1.githubusercontent.com/u/37399540?v=4?s=100" width="100px;" alt=""/><br /><sub><b>saksham93</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=saksham93" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/nikhilbarar"><img src="https://avatars2.githubusercontent.com/u/37332144?v=4?s=100" width="100px;" alt=""/><br /><sub><b>nikhilbarar</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=nikhilbarar" title="Code">💻</a></td>
-    <td align="center"><a href="http://colinbut.com"><img src="https://avatars2.githubusercontent.com/u/10725674?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Colin But</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=colinbut" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/ruslanpa"><img src="https://avatars2.githubusercontent.com/u/1503411?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ruslan</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ruslanpa" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/JuhoKang"><img src="https://avatars1.githubusercontent.com/u/4745294?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Juho Kang</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=JuhoKang" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/dheeraj-mummareddy"><img src="https://avatars2.githubusercontent.com/u/7002230?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Dheeraj Mummareddy</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=dheeraj-mummareddy" title="Code">💻</a></td>
-    <td align="center"><a href="https://www.bernardosulzbach.com"><img src="https://avatars0.githubusercontent.com/u/8271090?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Bernardo Sulzbach</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=bernardosulzbach" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/4lexis"><img src="https://avatars0.githubusercontent.com/u/19871727?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Aleksandar Dudukovic</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=4lexis" title="Code">💻</a></td>
-    <td align="center"><a href="https://www.yusufaytas.com"><img src="https://avatars2.githubusercontent.com/u/1049483?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Yusuf Aytaş</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=yusufaytas" title="Code">💻</a></td>
-    <td align="center"><a href="http://futurehomes.hu"><img src="https://avatars2.githubusercontent.com/u/1001491?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Mihály Kuprivecz</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=qpi" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/kapinuss"><img src="https://avatars0.githubusercontent.com/u/17639945?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Stanislav Kapinus</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=kapinuss" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/gvsharma"><img src="https://avatars1.githubusercontent.com/u/6648152?v=4?s=100" width="100px;" alt=""/><br /><sub><b>GVSharma</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=gvsharma" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/SrdjanPaunovic"><img src="https://avatars1.githubusercontent.com/u/22815104?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Srđan Paunović</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=SrdjanPaunovic" title="Code">💻</a></td>
-    <td align="center"><a href="https://sideris.xyz/"><img src="https://avatars3.githubusercontent.com/u/5484694?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Petros G. Sideris</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=sideris" title="Code">💻</a></td>
-    <td align="center"><a href="https://www.linkedin.com/in/pramodgupta3/"><img src="https://avatars1.githubusercontent.com/u/2184241?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Pramod Gupta</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AIAmPramod" title="Reviewed Pull Requests">👀</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://amarnath510.github.io/portfolio"><img src="https://avatars0.githubusercontent.com/u/4599623?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Amarnath Chandana</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Amarnath510" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/Anurag870"><img src="https://avatars1.githubusercontent.com/u/6295975?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Anurag870</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Anurag870" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=Anurag870" title="Documentation">📖</a></td>
-    <td align="center"><a href="http://theerroris.me"><img src="https://avatars0.githubusercontent.com/u/1685953?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Wes Gilleland</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Deathnerd" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/Harshrajsinh"><img src="https://avatars2.githubusercontent.com/u/22811531?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Harshraj Thakor</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Harshrajsinh" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/MaVdbussche"><img src="https://avatars1.githubusercontent.com/u/26136934?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Martin Vandenbussche</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=MaVdbussche" title="Code">💻</a></td>
-    <td align="center"><a href="https://alexsomai.com"><img src="https://avatars1.githubusercontent.com/u/5720977?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Alexandru Somai</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=alexsomai" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/amogozov"><img src="https://avatars3.githubusercontent.com/u/7372215?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Artur Mogozov</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=amogozov" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/anthonycampbell"><img src="https://avatars3.githubusercontent.com/u/10249255?v=4?s=100" width="100px;" alt=""/><br /><sub><b>anthony</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=anthonycampbell" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="http://ccygnus.com/"><img src="https://avatars1.githubusercontent.com/u/9342724?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Christian Cygnus</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=christophercolumbusdog" title="Code">💻</a></td>
-    <td align="center"><a href="https://about.me/dzmitryh"><img src="https://avatars2.githubusercontent.com/u/5390492?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Dima Gubin</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=dzmitryh" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/jjjimenez100"><img src="https://avatars3.githubusercontent.com/u/22243493?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Joshua Jimenez</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=jjjimenez100" title="Code">💻</a></td>
-    <td align="center"><a href="http://about.me/kaiwinter"><img src="https://avatars0.githubusercontent.com/u/110982?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kai Winter</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=kaiwinter" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/lbroman"><img src="https://avatars1.githubusercontent.com/u/86007?v=4?s=100" width="100px;" alt=""/><br /><sub><b>lbroman</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=lbroman" title="Code">💻</a></td>
-    <td align="center"><a href="https://przemeknowak.com"><img src="https://avatars1.githubusercontent.com/u/3254609?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Przemek</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=pnowy" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/prafful1"><img src="https://avatars0.githubusercontent.com/u/14350274?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Prafful Agarwal</b></sub></a><br /><a href="#content-prafful1" title="Content">🖋</a></td>
-    <td align="center"><a href="https://github.com/sankypanhale"><img src="https://avatars1.githubusercontent.com/u/6478783?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Sanket Panhale</b></sub></a><br /><a href="#content-sankypanhale" title="Content">🖋</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/staillebois"><img src="https://avatars0.githubusercontent.com/u/23701200?v=4?s=100" width="100px;" alt=""/><br /><sub><b>staillebois</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=staillebois" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/valdar-hu"><img src="https://avatars3.githubusercontent.com/u/17962817?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Krisztián Nagy</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=valdar-hu" title="Code">💻</a></td>
-    <td align="center"><a href="https://www.vanogrid.com"><img src="https://avatars0.githubusercontent.com/u/4307918?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Alexander Ivanov</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=vanogrid" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/yosfik"><img src="https://avatars3.githubusercontent.com/u/4850270?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Yosfik Alqadri</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=yosfik" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/7agustibm"><img src="https://avatars0.githubusercontent.com/u/8149332?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Agustí Becerra Milà</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=7agustibm" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/Juaanma"><img src="https://avatars3.githubusercontent.com/u/7390500?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Juan Manuel Suárez</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Juaanma" title="Code">💻</a></td>
-    <td align="center"><a href="http://www.devsedge.net/"><img src="https://avatars0.githubusercontent.com/u/9956006?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Luigi Cortese</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=LuigiCortese" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/Rzeposlaw"><img src="https://avatars2.githubusercontent.com/u/18425745?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Katarzyna Rzepecka</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Rzeposlaw" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="http://adamski.pro"><img src="https://avatars1.githubusercontent.com/u/6537430?v=4?s=100" width="100px;" alt=""/><br /><sub><b>adamski.pro</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=akrystian" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/baislsl"><img src="https://avatars0.githubusercontent.com/u/17060584?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Shengli Bai</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=baislsl" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/besok"><img src="https://avatars2.githubusercontent.com/u/29834592?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Boris</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=besok" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/dmitraver"><img src="https://avatars3.githubusercontent.com/u/1798156?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Dmitry Avershin</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=dmitraver" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/fanofxiaofeng"><img src="https://avatars0.githubusercontent.com/u/3983683?v=4?s=100" width="100px;" alt=""/><br /><sub><b>靳阳</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=fanofxiaofeng" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/hoangnam2261"><img src="https://avatars2.githubusercontent.com/u/31692990?v=4?s=100" width="100px;" alt=""/><br /><sub><b>hoangnam2261</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=hoangnam2261" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/jarpit96"><img src="https://avatars2.githubusercontent.com/u/10098713?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Arpit Jain</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=jarpit96" title="Code">💻</a></td>
-    <td align="center"><a href="http://joningi.net"><img src="https://avatars2.githubusercontent.com/u/6115148?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jón Ingi Sveinbjörnsson</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=joningiwork" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/kirill-vlasov"><img src="https://avatars3.githubusercontent.com/u/16112495?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kirill Vlasov</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=kirill-vlasov" title="Code">💻</a></td>
-    <td align="center"><a href="http://mitchell-irvin.com"><img src="https://avatars0.githubusercontent.com/u/16233245?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Mitchell Irvin</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=mitchellirvin" title="Code">💻</a></td>
-    <td align="center"><a href="https://ranjeet-floyd.github.io"><img src="https://avatars0.githubusercontent.com/u/1992972?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ranjeet</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ranjeet-floyd" title="Code">💻</a></td>
-    <td align="center"><a href="https://alwayswithme.github.io"><img src="https://avatars3.githubusercontent.com/u/3234786?v=4?s=100" width="100px;" alt=""/><br /><sub><b>PhoenixYip</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Alwayswithme" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/MSaifAsif"><img src="https://avatars1.githubusercontent.com/u/6280554?v=4?s=100" width="100px;" alt=""/><br /><sub><b>M Saif Asif</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=MSaifAsif" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/kanwarpreet25"><img src="https://avatars0.githubusercontent.com/u/39183641?v=4?s=100" width="100px;" alt=""/><br /><sub><b>kanwarpreet25</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=kanwarpreet25" title="Code">💻</a></td>
-    <td align="center"><a href="http://leonmak.me"><img src="https://avatars3.githubusercontent.com/u/13071508?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Leon Mak</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=leonmak" title="Code">💻</a></td>
-    <td align="center"><a href="http://www.wramdemark.se"><img src="https://avatars2.githubusercontent.com/u/7052193?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Per Wramdemark</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=perwramdemark" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/waisuan"><img src="https://avatars2.githubusercontent.com/u/10975700?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Evan Sia Wai Suan</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=waisuan" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/AnaghaSasikumar"><img src="https://avatars2.githubusercontent.com/u/42939261?v=4?s=100" width="100px;" alt=""/><br /><sub><b>AnaghaSasikumar</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=AnaghaSasikumar" title="Code">💻</a></td>
-    <td align="center"><a href="https://christofferh.com"><img src="https://avatars1.githubusercontent.com/u/767643?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Christoffer Hamberg</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=christofferh" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/dgruntz"><img src="https://avatars0.githubusercontent.com/u/1516800?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Dominik Gruntz</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=dgruntz" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://bitbucket.org/hannespernpeintner/"><img src="https://avatars3.githubusercontent.com/u/1679437?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Hannes</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=hannespernpeintner" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/leogtzr"><img src="https://avatars0.githubusercontent.com/u/1211969?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Leo Gutiérrez Ramírez</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=leogtzr" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/npczwh"><img src="https://avatars0.githubusercontent.com/u/14066422?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Zhang WH</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=npczwh" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/oconnelc"><img src="https://avatars0.githubusercontent.com/u/1112973?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Christopher O'Connell</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=oconnelc" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/giorgosmav21"><img src="https://avatars2.githubusercontent.com/u/22855493?v=4?s=100" width="100px;" alt=""/><br /><sub><b>George Mavroeidis</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=giorgosmav21" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/hbothra15"><img src="https://avatars1.githubusercontent.com/u/7418012?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Hemant Bothra</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=hbothra15" title="Code">💻</a> <a href="#design-hbothra15" title="Design">🎨</a></td>
-    <td align="center"><a href="https://www.kevinpeters.net/about/"><img src="https://avatars1.githubusercontent.com/u/12736734?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Kevin Peters</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=igeligel" title="Code">💻</a></td>
-    <td align="center"><a href="https://llorllale.github.io/"><img src="https://avatars1.githubusercontent.com/u/2019896?v=4?s=100" width="100px;" alt=""/><br /><sub><b>George Aristy</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=llorllale" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/mookkiah"><img src="https://avatars1.githubusercontent.com/u/8975264?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Mahendran Mookkiah</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=mookkiah" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/Azureyjt"><img src="https://avatars2.githubusercontent.com/u/18476317?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Azureyjt</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Azureyjt" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/vehpsr"><img src="https://avatars2.githubusercontent.com/u/3133265?v=4?s=100" width="100px;" alt=""/><br /><sub><b>gans</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=vehpsr" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/ThatGuyWithTheHat"><img src="https://avatars0.githubusercontent.com/u/24470582?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Matt</b></sub></a><br /><a href="#content-ThatGuyWithTheHat" title="Content">🖋</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://www.linkedin.com/in/gopinathlangote/"><img src="https://avatars2.githubusercontent.com/u/10210778?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Gopinath Langote</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=gopinath-langote" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/hoswey"><img src="https://avatars3.githubusercontent.com/u/3689445?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Hoswey</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=hoswey" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/amit2103"><img src="https://avatars3.githubusercontent.com/u/7566692?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Amit Pandey</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=amit2103" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/gwildor28"><img src="https://avatars0.githubusercontent.com/u/16000365?v=4?s=100" width="100px;" alt=""/><br /><sub><b>gwildor28</b></sub></a><br /><a href="#content-gwildor28" title="Content">🖋</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://t.me/paul_docker"><img src="https://avatars1.githubusercontent.com/u/2404785?v=4?s=100" width="100px;" alt=""/><br /><sub><b>田浩</b></sub></a><br /><a href="#content-llitfkitfk" title="Content">🖋</a></td>
-    <td align="center"><a href="https://twitter.com/StPitsios"><img src="https://avatars1.githubusercontent.com/u/6773603?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Stamatis Pitsios</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=pitsios-s" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/qza"><img src="https://avatars3.githubusercontent.com/u/233149?v=4?s=100" width="100px;" alt=""/><br /><sub><b>qza</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=qza" title="Code">💻</a></td>
-    <td align="center"><a href="http://tschis.github.io"><img src="https://avatars1.githubusercontent.com/u/20662669?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Rodolfo Forte</b></sub></a><br /><a href="#content-Tschis" title="Content">🖋</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/ankurkaushal"><img src="https://avatars2.githubusercontent.com/u/2236616?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ankur Kaushal</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ankurkaushal" title="Code">💻</a></td>
-    <td align="center"><a href="https://www.linkedin.com/in/ovidijus-okinskas/"><img src="https://avatars0.githubusercontent.com/u/20372387?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ovidijus Okinskas</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=okinskas" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/robertt240"><img src="https://avatars1.githubusercontent.com/u/9137432?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Robert Kasperczyk</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=robertt240" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/trautonen"><img src="https://avatars3.githubusercontent.com/u/1641063?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Tapio Rautonen</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=trautonen" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="http://vk.com/yuri.orlov"><img src="https://avatars0.githubusercontent.com/u/1595733?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Yuri Orlov</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=yorlov" title="Code">💻</a></td>
-    <td align="center"><a href="https://www.linkedin.com/in/varunu28/"><img src="https://avatars0.githubusercontent.com/u/7676016?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Varun Upadhyay</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=varunu28" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/PalAditya"><img src="https://avatars2.githubusercontent.com/u/25523604?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Aditya Pal</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=PalAditya" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/grzesiekkedzior"><img src="https://avatars3.githubusercontent.com/u/23739158?v=4?s=100" width="100px;" alt=""/><br /><sub><b>grzesiekkedzior</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=grzesiekkedzior" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Agrzesiekkedzior" title="Reviewed Pull Requests">👀</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/sivasubramanim"><img src="https://avatars2.githubusercontent.com/u/51107434?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Sivasubramani M</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=sivasubramanim" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/d4gg4d"><img src="https://avatars2.githubusercontent.com/u/99457?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Sami Airaksinen</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=d4gg4d" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/vertti"><img src="https://avatars0.githubusercontent.com/u/557751?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Janne Sinivirta</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=vertti" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/Bobo1239"><img src="https://avatars1.githubusercontent.com/u/2302947?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Boris-Chengbiao Zhou</b></sub></a><br /><a href="#content-Bobo1239" title="Content">🖋</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://jahhein.github.io"><img src="https://avatars2.githubusercontent.com/u/10779515?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jacob Hein</b></sub></a><br /><a href="#content-Jahhein" title="Content">🖋</a></td>
-    <td align="center"><a href="https://github.com/iamrichardjones"><img src="https://avatars3.githubusercontent.com/u/14842151?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Richard Jones</b></sub></a><br /><a href="#content-iamrichardjones" title="Content">🖋</a></td>
-    <td align="center"><a href="https://rachelcarmena.github.io"><img src="https://avatars0.githubusercontent.com/u/22792183?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Rachel M. Carmena</b></sub></a><br /><a href="#content-rachelcarmena" title="Content">🖋</a></td>
-    <td align="center"><a href="https://zd-zero.github.io"><img src="https://avatars0.githubusercontent.com/u/21978370?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Zaerald Denze Lungos</b></sub></a><br /><a href="#content-zd-zero" title="Content">🖋</a></td>
-  </tr>
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-    <td align="center"><a href="https://webpro.nl"><img src="https://avatars1.githubusercontent.com/u/456426?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Lars Kappert</b></sub></a><br /><a href="#content-webpro" title="Content">🖋</a></td>
-    <td align="center"><a href="https://xiaod.info"><img src="https://avatars2.githubusercontent.com/u/21277644?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Mike Liu</b></sub></a><br /><a href="#translation-xiaod-dev" title="Translation">🌍</a></td>
-    <td align="center"><a href="https://github.com/charlesfinley"><img src="https://avatars1.githubusercontent.com/u/6307904?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Matt Dolan</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=charlesfinley" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Acharlesfinley" title="Reviewed Pull Requests">👀</a></td>
-    <td align="center"><a href="https://github.com/MananS77"><img src="https://avatars3.githubusercontent.com/u/21033516?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Manan</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AMananS77" title="Reviewed Pull Requests">👀</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/nishant"><img src="https://avatars2.githubusercontent.com/u/15331971?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Nishant Arora</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=nishant" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/raja-peeyush-kumar-singh"><img src="https://avatars0.githubusercontent.com/u/5496024?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Peeyush</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=raja-peeyush-kumar-singh" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/ravening"><img src="https://avatars1.githubusercontent.com/u/10645273?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Rakesh</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ravening" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Aravening" title="Reviewed Pull Requests">👀</a></td>
-    <td align="center"><a href="https://github.com/vINCENT8888801"><img src="https://avatars0.githubusercontent.com/u/8037883?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Wei Seng</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=vINCENT8888801" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://www.linkedin.com/in/ashish-trivedi-218379135/"><img src="https://avatars3.githubusercontent.com/u/23194128?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ashish Trivedi</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ashishtrivedi16" title="Code">💻</a></td>
-    <td align="center"><a href="https://rayyounghong.com"><img src="https://avatars1.githubusercontent.com/u/41055099?v=4?s=100" width="100px;" alt=""/><br /><sub><b>洪月阳</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=RayYH" title="Code">💻</a></td>
-    <td align="center"><a href="https://xdvrx1.github.io/"><img src="https://avatars0.githubusercontent.com/u/47092464?v=4?s=100" width="100px;" alt=""/><br /><sub><b>xdvrx1</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Axdvrx1" title="Reviewed Pull Requests">👀</a> <a href="#ideas-xdvrx1" title="Ideas, Planning, & Feedback">🤔</a></td>
-    <td align="center"><a href="http://subho.xyz"><img src="https://avatars0.githubusercontent.com/u/13291222?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Subhrodip Mohanta</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ohbus" title="Code">💻</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Aohbus" title="Reviewed Pull Requests">👀</a> <a href="#maintenance-ohbus" title="Maintenance">🚧</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/nahteb"><img src="https://avatars3.githubusercontent.com/u/13121570?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Bethan Palmer</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=nahteb" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/ToxicDreamz"><img src="https://avatars0.githubusercontent.com/u/45225562?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Toxic Dreamz</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ToxicDreamz" title="Code">💻</a></td>
-    <td align="center"><a href="http://www.edycutjong.com"><img src="https://avatars1.githubusercontent.com/u/1098102?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Edy Cu Tjong</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=edycutjong" title="Documentation">📖</a></td>
-    <td align="center"><a href="https://github.com/mkrzywanski"><img src="https://avatars0.githubusercontent.com/u/15279585?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Michał Krzywański</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=mkrzywanski" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://www.stefan-birkner.de"><img src="https://avatars1.githubusercontent.com/u/711349?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Stefan Birkner</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=stefanbirkner" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/fedorskvorcov"><img src="https://avatars3.githubusercontent.com/u/43882212?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Fedor Skvorcov</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=fedorskvorcov" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/samilAyoub"><img src="https://avatars0.githubusercontent.com/u/61546990?v=4?s=100" width="100px;" alt=""/><br /><sub><b>samilAyoub</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=samilAyoub" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/vdlald"><img src="https://avatars0.githubusercontent.com/u/29997701?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Vladislav Golubinov</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=vdlald" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/swarajsaaj"><img src="https://avatars2.githubusercontent.com/u/6285049?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Swaraj</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=swarajsaaj" title="Code">💻</a></td>
-    <td align="center"><a href="http://christophflick.de"><img src="https://avatars0.githubusercontent.com/u/4465376?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Christoph Flick</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ChFlick" title="Documentation">📖</a></td>
-    <td align="center"><a href="https://github.com/Ascenio"><img src="https://avatars1.githubusercontent.com/u/7662016?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ascênio</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AAscenio" title="Reviewed Pull Requests">👀</a></td>
-    <td align="center"><a href="https://www.linkedin.com/in/domenico-sibilio/"><img src="https://avatars2.githubusercontent.com/u/24280982?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Domenico Sibilio</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=dsibilio" title="Documentation">📖</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/akashchandwani"><img src="https://avatars2.githubusercontent.com/u/3483277?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Akash Chandwani</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Aakashchandwani" title="Reviewed Pull Requests">👀</a></td>
-    <td align="center"><a href="http://www.linkedin.com/in/manannikov"><img src="https://avatars2.githubusercontent.com/u/7019769?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Pavlo Manannikov</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=manannikov" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/eimanip"><img src="https://avatars0.githubusercontent.com/u/20307301?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Eiman</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=eimanip" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/OrangePants-R"><img src="https://avatars0.githubusercontent.com/u/42976136?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Rocky</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=OrangePants-R" title="Documentation">📖</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://ibrahimalii.github.io/"><img src="https://avatars2.githubusercontent.com/u/21141301?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ibrahim ali abdelghany</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AibrahimAlii" title="Reviewed Pull Requests">👀</a></td>
-    <td align="center"><a href="https://github.com/gkulkarni2020"><img src="https://avatars3.githubusercontent.com/u/5161548?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Girish Kulkarni</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=gkulkarni2020" title="Documentation">📖</a></td>
-    <td align="center"><a href="https://github.com/omk13"><img src="https://avatars0.githubusercontent.com/u/59054172?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Omar Karazoun</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=omk13" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/jeff303"><img src="https://avatars0.githubusercontent.com/u/3521562?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jeff Evans</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=jeff303" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://viveksb007.github.io"><img src="https://avatars1.githubusercontent.com/u/12713808?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Vivek Singh</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=viveksb007" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/siavashsoleymani"><img src="https://avatars2.githubusercontent.com/u/18074419?v=4?s=100" width="100px;" alt=""/><br /><sub><b>siavash</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=siavashsoleymani" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/ruchpeanuts"><img src="https://avatars0.githubusercontent.com/u/29301900?v=4?s=100" width="100px;" alt=""/><br /><sub><b>ruchpeanuts</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ruchpeanuts" title="Documentation">📖</a></td>
-    <td align="center"><a href="https://github.com/warp125"><img src="https://avatars1.githubusercontent.com/u/48073115?v=4?s=100" width="100px;" alt=""/><br /><sub><b>warp125</b></sub></a><br /><a href="#translation-warp125" title="Translation">🌍</a></td>
-  </tr>
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-    <td align="center"><a href="http://libkhadir.fr"><img src="https://avatars1.githubusercontent.com/u/45130488?v=4?s=100" width="100px;" alt=""/><br /><sub><b>KHADIR Tayeb</b></sub></a><br /><a href="#translation-tkhadir" title="Translation">🌍</a></td>
-    <td align="center"><a href="https://github.com/ignite1771"><img src="https://avatars2.githubusercontent.com/u/59446563?v=4?s=100" width="100px;" alt=""/><br /><sub><b>ignite1771</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ignite1771" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/demirhalil"><img src="https://avatars1.githubusercontent.com/u/22895118?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Halil Demir</b></sub></a><br /><a href="#translation-demirhalil" title="Translation">🌍</a></td>
-    <td align="center"><a href="https://github.com/rohit10000"><img src="https://avatars.githubusercontent.com/u/20845565?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Rohit Singh</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=rohit10000" title="Code">💻</a></td>
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-    <td align="center"><a href="https://github.com/byoungju94"><img src="https://avatars.githubusercontent.com/u/42516378?v=4?s=100" width="100px;" alt=""/><br /><sub><b>byoungju94</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=byoungju94" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/moustafafarhat"><img src="https://avatars.githubusercontent.com/u/38836727?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Moustafa Farhat</b></sub></a><br /><a href="#translation-moustafafarhat" title="Translation">🌍</a></td>
-    <td align="center"><a href="https://github.com/richardmr36"><img src="https://avatars.githubusercontent.com/u/19147333?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Martel Richard</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=richardmr36" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/va1m"><img src="https://avatars.githubusercontent.com/u/17025445?v=4?s=100" width="100px;" alt=""/><br /><sub><b>va1m</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=va1m" title="Code">💻</a></td>
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-    <td align="center"><a href="https://github.com/noamgrinch"><img src="https://avatars.githubusercontent.com/u/31648669?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Noam Greenshtain</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=noamgrinch" title="Code">💻</a></td>
-    <td align="center"><a href="https://xuyonghong.cn/"><img src="https://avatars.githubusercontent.com/u/14086462?v=4?s=100" width="100px;" alt=""/><br /><sub><b>yonghong Xu</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=qfxl" title="Documentation">📖</a></td>
-    <td align="center"><a href="https://www.linkedin.com/in/jinisha-vora"><img src="https://avatars.githubusercontent.com/u/40777762?v=4?s=100" width="100px;" alt=""/><br /><sub><b>jinishavora</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Ajinishavora" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=jinishavora" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/eas5"><img src="https://avatars.githubusercontent.com/u/50836521?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Elvys Soares</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=eas5" title="Code">💻</a></td>
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-    <td align="center"><a href="https://github.com/zWeBrain"><img src="https://avatars.githubusercontent.com/u/46642512?v=4?s=100" width="100px;" alt=""/><br /><sub><b>zWeBrain</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=zWeBrain" title="Code">💻</a></td>
-    <td align="center"><a href="https://al-assad.github.io/notion/"><img src="https://avatars.githubusercontent.com/u/22493821?v=4?s=100" width="100px;" alt=""/><br /><sub><b>余林颖</b></sub></a><br /><a href="#translation-Al-assad" title="Translation">🌍</a></td>
-    <td align="center"><a href="https://github.com/STudio26"><img src="https://avatars.githubusercontent.com/u/6988911?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Alain</b></sub></a><br /><a href="#translation-STudio26" title="Translation">🌍</a></td>
-    <td align="center"><a href="https://github.com/DEV-VRUPER"><img src="https://avatars.githubusercontent.com/u/30525467?v=4?s=100" width="100px;" alt=""/><br /><sub><b>VR</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=DEV-VRUPER" title="Documentation">📖</a></td>
-  </tr>
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-    <td align="center"><a href="https://github.com/JackieNim"><img src="https://avatars.githubusercontent.com/u/4138836?v=4?s=100" width="100px;" alt=""/><br /><sub><b>JackieNim</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=JackieNim" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/EdisonE3"><img src="https://avatars.githubusercontent.com/u/52118917?v=4?s=100" width="100px;" alt=""/><br /><sub><b>EdisonE3</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=EdisonE3" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/tao-sun2"><img src="https://avatars.githubusercontent.com/u/66189688?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Tao</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=tao-sun2" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/JuanManuelAbate"><img src="https://avatars.githubusercontent.com/u/16357060?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Juan Manuel Abate</b></sub></a><br /><a href="#translation-JuanManuelAbate" title="Translation">🌍</a></td>
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-    <td align="center"><a href="https://github.com/Xenilo137"><img src="https://avatars.githubusercontent.com/u/24865069?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Xenilo137</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Xenilo137" title="Code">💻</a></td>
-    <td align="center"><a href="https://www.linkedin.com/in/souzasamuel/"><img src="https://avatars.githubusercontent.com/u/17254162?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Samuel Souza</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=samuelpsouza" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/marlo2222"><img src="https://avatars.githubusercontent.com/u/40809563?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Marlo Henrique</b></sub></a><br /><a href="#translation-marlo2222" title="Translation">🌍</a></td>
-    <td align="center"><a href="https://github.com/AndriyPyzh"><img src="https://avatars.githubusercontent.com/u/57706635?v=4?s=100" width="100px;" alt=""/><br /><sub><b>AndriyPyzh</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=AndriyPyzh" title="Code">💻</a></td>
-  </tr>
-  <tr>
-    <td align="center"><a href="https://github.com/karthikbhat13"><img src="https://avatars.githubusercontent.com/u/22431014?v=4?s=100" width="100px;" alt=""/><br /><sub><b>karthikbhat13</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=karthikbhat13" title="Code">💻</a></td>
-    <td align="center"><a href="https://github.com/mortezaadi"><img src="https://avatars.githubusercontent.com/u/1329687?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Morteza Adigozalpour</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=mortezaadi" title="Code">💻</a></td>
-    <td align="center"><a href="https://stackoverflow.com/users/308565/nagaraj-tantri"><img src="https://avatars.githubusercontent.com/u/3784194?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Nagaraj Tantri</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=tan31989" title="Code">💻</a></td>
-    <td align="center"><a href="http://scuccimarri.it"><img src="https://avatars.githubusercontent.com/u/7107651?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Francesco Scuccimarri</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=frascu" title="Code">💻</a></td>
-  </tr>
-</table>
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