docs: update .all-contributorsrc [skip ci]

docs: update README.md [skip ci]
issue 1628 handled, removed mutex and semaphore from catalog. (#1634 )
2021-01-26 20:22:04 +00:00 · 2021-01-26 20:22:03 +00:00 · 2021-01-26 22:19:36 +02:00 · 2021-01-25 09:05:04 +05:30
65 changed files with 685 additions and 1723 deletions
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@ -1377,6 +1377,15 @@
      "contributions": [
        "translation"
      ]
    },
    {
      "login": "rohit10000",
      "name": "Rohit Singh",
      "avatar_url": "https://avatars.githubusercontent.com/u/20845565?v=4",
      "profile": "https://github.com/rohit10000",
      "contributions": [
        "code"
      ]
    }
  ],
  "contributorsPerLine": 4,
--- a/README.md
+++ b/README.md
@ -10,7 +10,7 @@
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=coverage)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
 [![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-151-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-152-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 <br/>
@ -301,6 +301,7 @@ This project is licensed under the terms of the MIT license.
    <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>
  </tr>
 </table>
--- a/data-transfer-object-enum-impl/README.md
+++ b/data-transfer-object-enum-impl/README.md
@ -1,54 +0,0 @@
 ---
 layout: pattern
 title: Data Transfer Object
 folder: data-transfer-object
 permalink: /patterns/data-transfer-object/
 categories: Architectural
 tags:
 - Performance
 ---
 ## Intent
 Pass data with multiple attributes in one shot from client to server, to avoid multiple calls to 
 remote server. 
 ## Explanation
 Real world example
 > We need to fetch information about customers from remote database. Instead of querying the 
 > attributes one at a time, we use DTOs to transfer all the relevant attributes in a single shot.     
 In plain words
 > Using DTO relevant information can be fetched with a single backend query. 
 Wikipedia says
 > In the field of programming a data transfer object (DTO) is an object that carries data between 
 > processes. The motivation for its use is that communication between processes is usually done 
 > resorting to remote interfaces (e.g. web services), where each call is an expensive operation. 
 > Because the majority of the cost of each call is related to the round-trip time between the client 
 > and the server, one way of reducing the number of calls is to use an object (the DTO) that 
 > aggregates the data that would have been transferred by the several calls, but that is served by 
 > one call only.
 ## Class diagram
 ![alt text](./etc/dto-enum-uml.png "data-transfer-object")
 ## Applicability
 Use the Data Transfer Object pattern when:
 * The client is asking for multiple information. And the information is related.
 * When you want to boost the performance to get resources.
 * You want reduced number of remote calls.
 ## Credits
 * [Design Pattern - Transfer Object Pattern](https://www.tutorialspoint.com/design_pattern/transfer_object_pattern.htm)
 * [Data Transfer Object](https://msdn.microsoft.com/en-us/library/ff649585.aspx)
 * [J2EE Design Patterns](https://www.amazon.com/gp/product/0596004273/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596004273&linkCode=as2&tag=javadesignpat-20&linkId=f27d2644fbe5026ea448791a8ad09c94)
 * [Patterns of Enterprise Application Architecture](https://www.amazon.com/gp/product/0321127420/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0321127420&linkCode=as2&tag=javadesignpat-20&linkId=014237a67c9d46f384b35e10151956bd)
--- a/data-transfer-object-enum-impl/etc/data-transfer-object-enum-impl.urm.puml
+++ b/data-transfer-object-enum-impl/etc/data-transfer-object-enum-impl.urm.puml
@ -1,129 +0,0 @@
@startuml
 package com.iluwatar.datatransferenum {
  class App {
    - LOGGER : Logger {static}
    + App()
    + main(args : String[]) {static}
  }
  class Product {
    - cost : Double
    - id : Long
    - name : String
    - price : Double
    - supplier : String
    + Product()
    + getCost() : Double
    + getId() : Long
    + getName() : String
    + getPrice() : Double
    + getSupplier() : String
    + setCost(cost : Double) : Product
    + setId(id : Long) : Product
    + setName(name : String) : Product
    + setPrice(price : Double) : Product
    + setSupplier(supplier : String) : Product
    + toString() : String
  }
  enum ProductDTO {
    + valueOf(name : String) : ProductDTO {static}
    + values() : ProductDTO[] {static}
  }
  -interface Cost {
    + getCost() : Double {abstract}
  }
  -interface Id {
    + getId() : Long {abstract}
  }
  -interface Name {
    + getName() : String {abstract}
  }
  -interface Price {
    + getPrice() : Double {abstract}
  }
  enum Request {
    + valueOf(name : String) : Request {static}
    + values() : Request[] {static}
  }
  class Create {
    - cost : Double
    - name : String
    - price : Double
    - supplier : String
    + Create()
    + getCost() : Double
    + getName() : String
    + getPrice() : Double
    + getSupplier() : String
    + setCost(cost : Double) : Create
    + setName(name : String) : Create
    + setPrice(price : Double) : Create
    + setSupplier(supplier : String) : Create
  }
  enum Response {
    + valueOf(name : String) : Response {static}
    + values() : Response[] {static}
  }
  class Private {
    - cost : Double
    - id : Long
    - name : String
    - price : Double
    + Private()
    + getCost() : Double
    + getId() : Long
    + getName() : String
    + getPrice() : Double
    + setCost(cost : Double) : Private
    + setId(id : Long) : Private
    + setName(name : String) : Private
    + setPrice(price : Double) : Private
    + toString() : String
  }
  class Public {
    - id : Long
    - name : String
    - price : Double
    + Public()
    + getId() : Long
    + getName() : String
    + getPrice() : Double
    + setId(id : Long) : Public
    + setName(name : String) : Public
    + setPrice(price : Double) : Public
    + toString() : String
  }
  -interface Supplier {
    + getSupplier() : String {abstract}
  }
  class ProductResource {
    - products : List<Product>
    + ProductResource(products : List<Product>)
    + getAllProductsForAdmin() : List<Private>
    + getAllProductsForCustomer() : List<Public>
    + getProducts() : List<Product>
    + save(createProductDTO : Create)
  }
 }
 Create ..+ Request
 Request ..+ ProductDTO
 Private ..+ Response
 Supplier ..+ ProductDTO
 Name ..+ ProductDTO
 ProductResource -->  "-products" Product
 Public ..+ Response
 Id ..+ ProductDTO
 Price ..+ ProductDTO
 Response ..+ ProductDTO
 Cost ..+ ProductDTO
 Create ..|> Name 
 Create ..|> Price 
 Create ..|> Cost 
 Create ..|> Supplier 
 Private ..|> Id 
 Private ..|> Name 
 Private ..|> Price 
 Private ..|> Cost 
 Public ..|> Id 
 Public ..|> Name 
 Public ..|> Price 
@enduml
--- a/data-transfer-object-enum-impl/etc/dto-enum-uml.png
+++ b/data-transfer-object-enum-impl/etc/dto-enum-uml.png
--- a/data-transfer-object-enum-impl/pom.xml
+++ b/data-transfer-object-enum-impl/pom.xml
@ -1,61 +0,0 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
    The MIT License
    Copyright © 2014-2019 Ilkka Seppälä
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
 -->
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.iluwatar</groupId>
        <artifactId>java-design-patterns</artifactId>
        <version>1.24.0-SNAPSHOT</version>
    </parent>
    <artifactId>data-transfer-object-enum-impl</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <executions>
                    <execution>
                        <configuration>
                            <archive>
                                <manifest>
                                    <mainClass>com.iluwatar.datatransferenum.App</mainClass>
                                </manifest>
                            </archive>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
 </project>
--- a/data-transfer-object-enum-impl/src/main/java/com/iluwatar/datatransferenum/App.java
+++ b/data-transfer-object-enum-impl/src/main/java/com/iluwatar/datatransferenum/App.java
@ -1,59 +0,0 @@
 package com.iluwatar.datatransferenum;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 /**
 * The Data Transfer Object pattern is a design pattern in which an data transfer object is used to
 * serve related information together to avoid multiple call for each piece of information.
 *
 * <p>In this example, ({@link App}) as as product details consumer i.e. client to
 * request for product details to server.
 *
 * <p>productResource ({@link ProductResource}) act as server to serve product information. And
 * The productDto ({@link ProductDto} is data transfer object to share product information.
 */
 public class App {
  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
  /**
   * Method as act client and request to server for details.
   *
   * @param args program argument.
   */
  public static void main(String[] args) {
    Product tv =
        new Product().setId(1L).setName("TV").setSupplier("Sony").setPrice(1000D).setCost(1090D);
    Product microwave =
        new Product().setId(2L).setName("microwave").setSupplier("Delonghi").setPrice(1000D)
            .setCost(1090D);
    Product refrigerator =
        new Product().setId(3L).setName("refrigerator").setSupplier("Botsch").setPrice(1000D)
            .setCost(1090D);
    Product airConditioner =
        new Product().setId(4L).setName("airConditioner").setSupplier("LG").setPrice(1000D)
            .setCost(1090D);
    List<Product> products =
        new ArrayList<>(Arrays.asList(tv, microwave, refrigerator, airConditioner));
    ProductResource productResource = new ProductResource(products);
    LOGGER.info("####### List of products including sensitive data just for admins: \n {}",
        Arrays.toString(productResource.getAllProductsForAdmin().toArray()));
    LOGGER.info("####### List of products for customers: \n {}",
        Arrays.toString(productResource.getAllProductsForCustomer().toArray()));
    LOGGER.info("####### Going to save Sony PS5 ...");
    ProductDto.Request.Create createProductRequestDto = new ProductDto.Request.Create()
        .setName("PS5")
        .setCost(1000D)
        .setPrice(1220D)
        .setSupplier("Sony");
    productResource.save(createProductRequestDto);
    LOGGER.info("####### List of products after adding PS5: {}",
        Arrays.toString(productResource.getProducts().toArray()));
  }
 }
--- a/data-transfer-object-enum-impl/src/test/java/com/iluwatar/datatransferenum/AppTest.java
+++ b/data-transfer-object-enum-impl/src/test/java/com/iluwatar/datatransferenum/AppTest.java
@ -1,44 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.datatransferenum;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 import org.junit.jupiter.api.Test;
 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#main(String[])}
   * throws an exception.
   */
  @Test
  void shouldExecuteApplicationWithoutException() {
    assertDoesNotThrow(() -> App.main(new String[] {}));
  }
 }
--- a/data-transfer-object/src/main/java/com/iluwatar/datatransfer/App.java
+++ b/data-transfer-object/src/main/java/com/iluwatar/datatransfer/App.java
@ -23,7 +23,13 @@
 package com.iluwatar.datatransfer;
 import com.iluwatar.datatransfer.customer.CustomerDto;
 import com.iluwatar.datatransfer.customer.CustomerResource;
 import com.iluwatar.datatransfer.product.Product;
 import com.iluwatar.datatransfer.product.ProductDto;
 import com.iluwatar.datatransfer.product.ProductResource;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@ -32,11 +38,17 @@ import org.slf4j.LoggerFactory;
 * The Data Transfer Object pattern is a design pattern in which an data transfer object is used to
 * serve related information together to avoid multiple call for each piece of information.
 *
- * <p>In this example, ({@link App}) as as customer details consumer i.e. client to
+ * <p>In the first example, {@link App} is a customer details consumer i.e. client to
- * request for customer details to server.
+ * request for customer details to server. {@link CustomerResource} act as server to serve customer
 * information. {@link CustomerDto} is data transfer object to share customer information.
 *
 * <p>In the second example, {@link App} is a product details consumer i.e. client to
 * request for product details to server. {@link ProductResource} acts as server to serve
 * product information. {@link ProductDto} is data transfer object to share product information.
 *
 * <p>The pattern implementation is a bit different in each of the examples. The first can be
 * thought as a traditional example and the second is an enum based implementation.
 *
 * <p>CustomerResource ({@link CustomerResource}) act as server to serve customer information. And
 * The CustomerDto ({@link CustomerDto} is data transfer object to share customer information.
 */
 public class App {
@ -48,6 +60,8 @@ public class App {
   * @param args program argument.
   */
  public static void main(String[] args) {
    // Example 1: Customer DTO
    var customerOne = new CustomerDto("1", "Kelly", "Brown");
    var customerTwo = new CustomerDto("2", "Alfonso", "Bass");
    var customers = new ArrayList<>(List.of(customerOne, customerTwo));
@ -72,6 +86,53 @@ public class App {
    customerResource.save(customerThree);
    allCustomers = customerResource.getAllCustomers();
    printCustomerDetails(allCustomers);
    // Example 2: Product DTO
    Product tv =
        new Product().setId(1L).setName("TV").setSupplier("Sony").setPrice(1000D).setCost(1090D);
    Product microwave =
        new Product()
            .setId(2L)
            .setName("microwave")
            .setSupplier("Delonghi")
            .setPrice(1000D)
            .setCost(1090D);
    Product refrigerator =
        new Product()
            .setId(3L)
            .setName("refrigerator")
            .setSupplier("Botsch")
            .setPrice(1000D)
            .setCost(1090D);
    Product airConditioner =
        new Product()
            .setId(4L)
            .setName("airConditioner")
            .setSupplier("LG")
            .setPrice(1000D)
            .setCost(1090D);
    List<Product> products =
        new ArrayList<>(Arrays.asList(tv, microwave, refrigerator, airConditioner));
    ProductResource productResource = new ProductResource(products);
    LOGGER.info(
        "####### List of products including sensitive data just for admins: \n {}",
        Arrays.toString(productResource.getAllProductsForAdmin().toArray()));
    LOGGER.info(
        "####### List of products for customers: \n {}",
        Arrays.toString(productResource.getAllProductsForCustomer().toArray()));
    LOGGER.info("####### Going to save Sony PS5 ...");
    ProductDto.Request.Create createProductRequestDto =
        new ProductDto.Request.Create()
            .setName("PS5")
            .setCost(1000D)
            .setPrice(1220D)
            .setSupplier("Sony");
    productResource.save(createProductRequestDto);
    LOGGER.info(
        "####### List of products after adding PS5: {}",
        Arrays.toString(productResource.getProducts().toArray()));
  }
  private static void printCustomerDetails(List<CustomerDto> allCustomers) {
--- a/data-transfer-object/src/main/java/com/iluwatar/datatransfer/customer/CustomerDto.java
+++ b/data-transfer-object/src/main/java/com/iluwatar/datatransfer/customer/CustomerDto.java
@ -21,7 +21,7 @@
 * THE SOFTWARE.
 */
-package com.iluwatar.datatransfer;
+package com.iluwatar.datatransfer.customer;
 /**
 * {@link CustomerDto} is a data transfer object POJO. Instead of sending individual information to
--- a/data-transfer-object/src/main/java/com/iluwatar/datatransfer/customer/CustomerResource.java
+++ b/data-transfer-object/src/main/java/com/iluwatar/datatransfer/customer/CustomerResource.java
@ -21,7 +21,7 @@
 * THE SOFTWARE.
 */
-package com.iluwatar.datatransfer;
+package com.iluwatar.datatransfer.customer;
 import java.util.List;
--- a/data-transfer-object-enum-impl/src/main/java/com/iluwatar/datatransferenum/Product.java
+++ b/data-transfer-object-enum-impl/src/main/java/com/iluwatar/datatransferenum/Product.java
@ -1,4 +1,27 @@
-package com.iluwatar.datatransferenum;
+/*
 * The MIT License
 * Copyright © 2014-2019 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.datatransfer.product;
 /**
 * {@link Product} is a entity class for product entity. This class act as entity in the demo.
--- a/data-transfer-object-enum-impl/src/main/java/com/iluwatar/datatransferenum/ProductDto.java
+++ b/data-transfer-object-enum-impl/src/main/java/com/iluwatar/datatransferenum/ProductDto.java
@ -1,4 +1,27 @@
-package com.iluwatar.datatransferenum;
+/*
 * The MIT License
 * Copyright © 2014-2019 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.datatransfer.product;
 /**
 * {@link ProductDto} is a data transfer object POJO.
--- a/data-transfer-object-enum-impl/src/main/java/com/iluwatar/datatransferenum/ProductResource.java
+++ b/data-transfer-object-enum-impl/src/main/java/com/iluwatar/datatransferenum/ProductResource.java
@ -1,4 +1,27 @@
-package com.iluwatar.datatransferenum;
+/*
 * The MIT License
 * Copyright © 2014-2019 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.datatransfer.product;
 import java.util.List;
 import java.util.stream.Collectors;
--- a/data-transfer-object/src/test/java/com/iluwatar/datatransfer/customer/CustomerResourceTest.java
+++ b/data-transfer-object/src/test/java/com/iluwatar/datatransfer/customer/CustomerResourceTest.java
@ -21,13 +21,16 @@
 * THE SOFTWARE.
 */
-package com.iluwatar.datatransfer;
+package com.iluwatar.datatransfer.customer;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import java.util.ArrayList;
 import java.util.List;
 import com.iluwatar.datatransfer.customer.CustomerDto;
 import com.iluwatar.datatransfer.customer.CustomerResource;
 import org.junit.jupiter.api.Test;
 /**
--- a/mutex/README.md
+++ b/mutex/README.md
@ -1,31 +0,0 @@
 ---
 layout: pattern
 title: Mutex
 folder: mutex
 permalink: /patterns/mutex/
 categories: Concurrency
 tags: 
 - Decoupling
 ---
 ## Also known as
 * Mutual Exclusion Lock
 * Binary Semaphore
 ## Intent
 Create a lock which only allows a single thread to access a resource at any one instant.
 ## Class diagram
 ![alt text](./etc/mutex.png "Mutex")
 ## Applicability
 Use a Mutex when
 * You need to prevent two threads accessing a critical section at the same time
 * Concurrent access to a resource could lead to a race condition 
 ## Credits
 * [Lock (computer science)](http://en.wikipedia.org/wiki/Lock_(computer_science))
 * [Semaphores](http://tutorials.jenkov.com/java-concurrency/semaphores.html)
--- a/mutex/etc/mutex.png
+++ b/mutex/etc/mutex.png
--- a/mutex/etc/mutex.urm.puml
+++ b/mutex/etc/mutex.urm.puml
@ -1,27 +0,0 @@
@startuml
 package com.iluwatar.mutex {
  class App {
    + App()
    + main(args : String[]) {static}
  }
  class Jar {
    - beans : int
    - lock : Lock
    + Jar(beans : int, lock : Lock)
    + takeBean() : boolean
  }
  interface Lock {
    + acquire() {abstract}
    + release() {abstract}
  }
  class Mutex {
    - owner : Object
    + Mutex()
    + acquire()
    + getOwner() : Object
    + release()
  }
 }
 Jar -->  "-lock" Lock
 Mutex ..|> Lock 
@enduml
--- a/mutex/pom.xml
+++ b/mutex/pom.xml
@ -1,61 +0,0 @@
 <?xml version="1.0"?>
 <!--
    The MIT License
    Copyright © 2014-2019 Ilkka Seppälä
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
 -->
 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.iluwatar</groupId>
    <artifactId>java-design-patterns</artifactId>
    <version>1.24.0-SNAPSHOT</version>
  </parent>
  <artifactId>mutex</artifactId>
  <dependencies>
    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-engine</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
          <execution>
            <configuration>
              <archive>
                <manifest>
                  <mainClass>com.iluwatar.mutex.App</mainClass>
                </manifest>
              </archive>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
 </project>
--- a/mutex/src/main/java/com/iluwatar/mutex/App.java
+++ b/mutex/src/main/java/com/iluwatar/mutex/App.java
@ -1,49 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.mutex;
 /**
 * A Mutex prevents multiple threads from accessing a resource simultaneously.
 *
 * <p>In this example we have two thieves who are taking beans from a jar. Only one thief can take
 * a bean at a time. This is ensured by a Mutex lock which must be acquired in order to access the
 * jar. Each thief attempts to acquire the lock, take a bean and then release the lock. If the lock
 * has already been acquired, the thief will be prevented from continuing (blocked) until the lock
 * has been released. The thieves stop taking beans once there are no beans left to take.
 */
 public class App {
  /**
   * main method.
   */
  public static void main(String[] args) {
    var mutex = new Mutex();
    var jar = new Jar(1000, mutex);
    var peter = new Thief("Peter", jar);
    var john = new Thief("John", jar);
    peter.start();
    john.start();
  }
 }
--- a/mutex/src/main/java/com/iluwatar/mutex/Jar.java
+++ b/mutex/src/main/java/com/iluwatar/mutex/Jar.java
@ -1,67 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.mutex;
 /**
 * A Jar has a resource of beans which can only be accessed by a single Thief (thread) at any one
 * time. A Mutex lock is used to prevent more than one Thief taking a bean simultaneously.
 */
 public class Jar {
  /**
   * The lock which must be acquired to access the beans resource.
   */
  private final Lock lock;
  /**
   * The resource within the jar.
   */
  private int beans;
  public Jar(int beans, Lock lock) {
    this.beans = beans;
    this.lock = lock;
  }
  /**
   * Method for a thief to take a bean.
   */
  public boolean takeBean() {
    var success = false;
    try {
      lock.acquire();
      success = beans > 0;
      if (success) {
        beans = beans - 1;
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      lock.release();
    }
    return success;
  }
 }
--- a/mutex/src/main/java/com/iluwatar/mutex/Lock.java
+++ b/mutex/src/main/java/com/iluwatar/mutex/Lock.java
@ -1,35 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.mutex;
 /**
 * Lock is an interface for a lock which can be acquired and released.
 */
 public interface Lock {
  void acquire() throws InterruptedException;
  void release();
 }
--- a/mutex/src/main/java/com/iluwatar/mutex/Mutex.java
+++ b/mutex/src/main/java/com/iluwatar/mutex/Mutex.java
@ -1,67 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.mutex;
 /**
 * Mutex is an implementation of a mutual exclusion lock.
 */
 public class Mutex implements Lock {
  /**
   * The current owner of the lock.
   */
  private Object owner;
  /**
   * Returns the current owner of the Mutex, or null if available.
   */
  public Object getOwner() {
    return owner;
  }
  /**
   * Method called by a thread to acquire the lock. If the lock has already been acquired this will
   * wait until the lock has been released to re-attempt the acquire.
   */
  @Override
  public synchronized void acquire() throws InterruptedException {
    while (owner != null) {
      wait();
    }
    owner = Thread.currentThread();
  }
  /**
   * Method called by a thread to release the lock.
   */
  @Override
  public synchronized void release() {
    if (Thread.currentThread() == owner) {
      owner = null;
      notify();
    }
  }
 }
--- a/mutex/src/main/java/com/iluwatar/mutex/Thief.java
+++ b/mutex/src/main/java/com/iluwatar/mutex/Thief.java
@ -1,67 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.mutex;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 /**
 * Thief is a class which continually tries to acquire a jar and take a bean from it. When the jar
 * is empty the thief stops.
 */
 public class Thief extends Thread {
  private static final Logger LOGGER = LoggerFactory.getLogger(Thief.class);
  /**
   * The name of the thief.
   */
  private final String name;
  /**
   * The jar.
   */
  private final Jar jar;
  public Thief(String name, Jar jar) {
    this.name = name;
    this.jar = jar;
  }
  /**
   * In the run method the thief repeatedly tries to take a bean until none are left.
   */
  @Override
  public void run() {
    var beans = 0;
    while (jar.takeBean()) {
      beans = beans + 1;
      LOGGER.info("{} took a bean.", name);
    }
    LOGGER.info("{} took {} beans.", name, beans);
  }
 }
--- a/mutex/src/test/java/com/iluwatar/mutex/AppTest.java
+++ b/mutex/src/test/java/com/iluwatar/mutex/AppTest.java
@ -1,39 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.mutex;
 import org.junit.jupiter.api.Test;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 /**
 * Application Test Entrypoint
 */
 class AppTest {
  @Test
  void shouldExecuteApplicationWithoutException() {
    assertDoesNotThrow(() -> App.main(new String[]{}));
  }
 }
--- a/mutex/src/test/java/com/iluwatar/mutex/JarTest.java
+++ b/mutex/src/test/java/com/iluwatar/mutex/JarTest.java
@ -1,45 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.mutex;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import java.util.stream.IntStream;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 /**
 * Test case for taking beans from a Jar
 */
 public class JarTest {
  @Test
  public void testTakeBeans() {
    var mutex = new Mutex();
    var jar = new Jar(10, mutex);
    IntStream.range(0, 10).mapToObj(i -> jar.takeBean()).forEach(Assertions::assertTrue);
    assertFalse(jar.takeBean());
  }
 }
--- a/mutex/src/test/java/com/iluwatar/mutex/MutexTest.java
+++ b/mutex/src/test/java/com/iluwatar/mutex/MutexTest.java
@ -1,51 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.mutex;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.fail;
 import org.junit.jupiter.api.Test;
 /**
 * Test case for acquiring and releasing a Mutex
 */
 public class MutexTest {
  @Test
  public void acquireReleaseTest() {
    var mutex = new Mutex();
    assertNull(mutex.getOwner());
    try {
      mutex.acquire();
      assertEquals(mutex.getOwner(), Thread.currentThread());
    } catch (InterruptedException e) {
      fail(e.toString());
    }
    mutex.release();
    assertNull(mutex.getOwner());
  }
 }
--- a/pom.xml
+++ b/pom.xml
@ -141,8 +141,6 @@
        <module>module</module>
        <module>monad</module>
        <module>mute-idiom</module>
        <module>mutex</module>
        <module>semaphore</module>
        <module>hexagonal</module>
        <module>abstract-document</module>
        <module>aggregator-microservices</module>
@ -199,7 +197,6 @@
        <module>filterer</module>
        <module>factory</module>
        <module>separated-interface</module>
        <module>data-transfer-object-enum-impl</module>
        <module>special-case</module>
    </modules>
--- a/registry/pom.xml
+++ b/registry/pom.xml
@ -1,4 +1,28 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
    The MIT License
    Copyright © 2014-2019 Ilkka Seppälä
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
 -->
 <project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
--- a/registry/src/main/java/com/iluwatar/registry/App.java
+++ b/registry/src/main/java/com/iluwatar/registry/App.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.registry;
 import org.slf4j.Logger;
--- a/registry/src/main/java/com/iluwatar/registry/Customer.java
+++ b/registry/src/main/java/com/iluwatar/registry/Customer.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.registry;
 public class Customer {
--- a/registry/src/main/java/com/iluwatar/registry/CustomerRegistry.java
+++ b/registry/src/main/java/com/iluwatar/registry/CustomerRegistry.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.registry;
 import java.util.Map;
--- a/registry/src/test/java/com/iluwatar/registry/CustomerRegistryTest.java
+++ b/registry/src/test/java/com/iluwatar/registry/CustomerRegistryTest.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.registry;
 import org.junit.jupiter.api.BeforeAll;
--- a/semaphore/README.md
+++ b/semaphore/README.md
@ -1,33 +0,0 @@
 ---
 layout: pattern
 title: Semaphore
 folder: semaphore
 permalink: /patterns/semaphore/
 categories: Concurrency
 tags: 
 - Performance
 ---
 ## Also known as
 Counting Semaphore
 ## Intent
 Create a lock which mediates access to a pool of resources. 
 Only a limited number of threads, specified at the creation 
 of the semaphore, can access the resources at any given time.
 A semaphore which only allows one concurrent access to a resource
 is called a binary semaphore.
 ## Class diagram
 ![alt text](./etc/semaphore.png "Semaphore")
 ## Applicability
 Use a Semaphore when 
 * You have a pool of resources to allocate to different threads
 * Concurrent access to a resource could lead to a race condition 
 ## Credits
 * [Semaphore(programming)] (http://en.wikipedia.org/wiki/Semaphore_(programming))
 * [Semaphores] (http://tutorials.jenkov.com/java-concurrency/semaphores.html)
--- a/semaphore/etc/semaphore.png
+++ b/semaphore/etc/semaphore.png
--- a/semaphore/etc/semaphore.urm.puml
+++ b/semaphore/etc/semaphore.urm.puml
@ -1,56 +0,0 @@
@startuml
 package com.iluwatar.semaphore {
  class App {
    + App()
    + main(args : String[]) {static}
  }
  class Fruit {
    - type : FruitType
    + Fruit(type : FruitType)
    + getType() : FruitType
    + toString() : String
  }
  enum FruitType {
    + APPLE {static}
    + LEMON {static}
    + ORANGE {static}
    + valueOf(name : String) : FruitType {static}
    + values() : FruitType[] {static}
  }
  class FruitBowl {
    - fruit : List<Fruit>
    + FruitBowl()
    + countFruit() : int
    + put(f : Fruit)
    + take() : Fruit
    + toString() : String
  }
  class FruitShop {
    - available : boolean[]
    - bowls : FruitBowl[]
    - semaphore : Semaphore
    + FruitShop()
    + countFruit() : int
    + returnBowl(bowl : FruitBowl)
    + takeBowl() : FruitBowl
  }
  interface Lock {
    + acquire() {abstract}
    + release() {abstract}
  }
  class Semaphore {
    - counter : int
    - licenses : int
    + Semaphore(licenses : int)
    + acquire()
    + getAvailableLicenses() : int
    + getNumLicenses() : int
    + release()
  }
 }
 FruitType ..+ Fruit
 Fruit -->  "-type" FruitType
 FruitShop -->  "-semaphore" Semaphore
 FruitBowl -->  "-fruit" Fruit
 Semaphore ..|> Lock 
@enduml
--- a/semaphore/pom.xml
+++ b/semaphore/pom.xml
@ -1,61 +0,0 @@
 <?xml version="1.0"?>
 <!--
    The MIT License
    Copyright © 2014-2019 Ilkka Seppälä
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
 -->
 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.iluwatar</groupId>
    <artifactId>java-design-patterns</artifactId>
    <version>1.24.0-SNAPSHOT</version>
  </parent>
  <artifactId>semaphore</artifactId>
  <dependencies>
    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-engine</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
          <execution>
            <configuration>
              <archive>
                <manifest>
                  <mainClass>com.iluwatar.semaphore.App</mainClass>
                </manifest>
              </archive>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
 </project>
--- a/semaphore/src/main/java/com/iluwatar/semaphore/App.java
+++ b/semaphore/src/main/java/com/iluwatar/semaphore/App.java
@ -1,50 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 /**
 * A Semaphore mediates access by a group of threads to a pool of resources.
 *
 * <p>In this example a group of customers are taking fruit from a fruit shop. There is a bowl each
 * of apples, oranges and lemons. Only one customer can access a bowl simultaneously. A Semaphore is
 * used to indicate how many resources are currently available and must be acquired in order for a
 * bowl to be given to a customer. Customers continually try to take fruit until there is no fruit
 * left in the shop.
 */
 public class App {
  /**
   * main method.
   */
  public static void main(String[] args) {
    var shop = new FruitShop();
    new Customer("Peter", shop).start();
    new Customer("Paul", shop).start();
    new Customer("Mary", shop).start();
    new Customer("John", shop).start();
    new Customer("Ringo", shop).start();
    new Customer("George", shop).start();
  }
 }
--- a/semaphore/src/main/java/com/iluwatar/semaphore/Customer.java
+++ b/semaphore/src/main/java/com/iluwatar/semaphore/Customer.java
@ -1,82 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 /**
 * A Customer attempts to repeatedly take Fruit from the FruitShop by taking Fruit from FruitBowl
 * instances.
 */
 public class Customer extends Thread {
  private static final Logger LOGGER = LoggerFactory.getLogger(Customer.class);
  /**
   * Name of the Customer.
   */
  private final String name;
  /**
   * The FruitShop he is using.
   */
  private final FruitShop fruitShop;
  /**
   * Their bowl of Fruit.
   */
  private final FruitBowl fruitBowl;
  /**
   * Customer constructor.
   */
  public Customer(String name, FruitShop fruitShop) {
    this.name = name;
    this.fruitShop = fruitShop;
    this.fruitBowl = new FruitBowl();
  }
  /**
   * The Customer repeatedly takes Fruit from the FruitShop until no Fruit remains.
   */
  public void run() {
    while (fruitShop.countFruit() > 0) {
      var bowl = fruitShop.takeBowl();
      if (bowl != null) {
        var fruit = bowl.take();
        if (fruit != null) {
          LOGGER.info("{} took an {}", name, fruit);
          fruitBowl.put(fruit);
          fruitShop.returnBowl(bowl);
        }
      }
    }
    LOGGER.info("{} took {}", name, fruitBowl);
  }
 }
--- a/semaphore/src/main/java/com/iluwatar/semaphore/Fruit.java
+++ b/semaphore/src/main/java/com/iluwatar/semaphore/Fruit.java
@ -1,64 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 /**
 * Fruit is a resource stored in a FruitBowl.
 */
 public class Fruit {
  /**
   * Enumeration of Fruit Types.
   */
  public enum FruitType {
    ORANGE, APPLE, LEMON
  }
  private final FruitType type;
  public Fruit(FruitType type) {
    this.type = type;
  }
  public FruitType getType() {
    return type;
  }
  /**
   * toString method.
   */
  public String toString() {
    switch (type) {
      case ORANGE:
        return "Orange";
      case APPLE:
        return "Apple";
      case LEMON:
        return "Lemon";
      default:
        return "";
    }
  }
 }
--- a/semaphore/src/main/java/com/iluwatar/semaphore/FruitBowl.java
+++ b/semaphore/src/main/java/com/iluwatar/semaphore/FruitBowl.java
@ -1,92 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 import java.util.ArrayList;
 import java.util.List;
 /**
 * A FruitBowl contains Fruit.
 */
 public class FruitBowl {
  private final List<Fruit> fruit = new ArrayList<>();
  /**
   * Returns the amount of fruits left in bowl.
   *
   * @return The amount of Fruit left in the bowl.
   */
  public int countFruit() {
    return fruit.size();
  }
  /**
   * Put an item of Fruit into the bowl.
   *
   * @param f fruit
   */
  public void put(Fruit f) {
    fruit.add(f);
  }
  /**
   * Take an item of Fruit out of the bowl.
   *
   * @return The Fruit taken out of the bowl, or null if empty.
   */
  public Fruit take() {
    if (fruit.isEmpty()) {
      return null;
    } else {
      return fruit.remove(0);
    }
  }
  /**
   * toString method.
   */
  public String toString() {
    var apples = 0;
    var oranges = 0;
    var lemons = 0;
    for (var f : fruit) {
      switch (f.getType()) {
        case APPLE:
          apples++;
          break;
        case ORANGE:
          oranges++;
          break;
        case LEMON:
          lemons++;
          break;
        default:
      }
    }
    return apples + " Apples, " + oranges + " Oranges, and " + lemons + " Lemons";
  }
 }
--- a/semaphore/src/main/java/com/iluwatar/semaphore/FruitShop.java
+++ b/semaphore/src/main/java/com/iluwatar/semaphore/FruitShop.java
@ -1,120 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 /**
 * A FruitShop contains three FruitBowl instances and controls access to them.
 */
 public class FruitShop {
  /**
   * The FruitBowl instances stored in the class.
   */
  private final FruitBowl[] bowls = {
      new FruitBowl(),
      new FruitBowl(),
      new FruitBowl()
  };
  /**
   * Access flags for each of the FruitBowl instances.
   */
  private final boolean[] available = {
      true,
      true,
      true
  };
  /**
   * The Semaphore that controls access to the class resources.
   */
  private final Semaphore semaphore;
  /**
   * FruitShop constructor.
   */
  public FruitShop() {
    for (var i = 0; i < 100; i++) {
      bowls[0].put(new Fruit(Fruit.FruitType.APPLE));
      bowls[1].put(new Fruit(Fruit.FruitType.ORANGE));
      bowls[2].put(new Fruit(Fruit.FruitType.LEMON));
    }
    semaphore = new Semaphore(3);
  }
  /**
   * Returns the amount of fruits left in shop.
   *
   * @return The amount of Fruit left in the shop.
   */
  public synchronized int countFruit() {
    return bowls[0].countFruit() + bowls[1].countFruit() + bowls[2].countFruit();
  }
  /**
   * Method called by Customer to get a FruitBowl from the shop. This method will try to acquire the
   * Semaphore before returning the first available FruitBowl.
   */
  public synchronized FruitBowl takeBowl() {
    FruitBowl bowl = null;
    try {
      semaphore.acquire();
      if (available[0]) {
        bowl = bowls[0];
        available[0] = false;
      } else if (available[1]) {
        bowl = bowls[1];
        available[1] = false;
      } else if (available[2]) {
        bowl = bowls[2];
        available[2] = false;
      }
    } catch (InterruptedException e) {
      e.printStackTrace();
    } finally {
      semaphore.release();
    }
    return bowl;
  }
  /**
   * Method called by a Customer instance to return a FruitBowl to the shop. This method releases
   * the Semaphore, making the FruitBowl available to another Customer.
   */
  public synchronized void returnBowl(FruitBowl bowl) {
    if (bowl == bowls[0]) {
      available[0] = true;
    } else if (bowl == bowls[1]) {
      available[1] = true;
    } else if (bowl == bowls[2]) {
      available[2] = true;
    }
  }
 }
--- a/semaphore/src/main/java/com/iluwatar/semaphore/Lock.java
+++ b/semaphore/src/main/java/com/iluwatar/semaphore/Lock.java
@ -1,35 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 /**
 * Lock is an interface for a lock which can be acquired and released.
 */
 public interface Lock {
  void acquire() throws InterruptedException;
  void release();
 }
--- a/semaphore/src/main/java/com/iluwatar/semaphore/Semaphore.java
+++ b/semaphore/src/main/java/com/iluwatar/semaphore/Semaphore.java
@ -1,77 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 /**
 * Semaphore is an implementation of a semaphore lock.
 */
 public class Semaphore implements Lock {
  private final int licenses;
  /**
   * The number of concurrent resource accesses which are allowed.
   */
  private int counter;
  public Semaphore(int licenses) {
    this.licenses = licenses;
    this.counter = licenses;
  }
  /**
   * Returns the number of licenses managed by the Semaphore.
   */
  public int getNumLicenses() {
    return licenses;
  }
  /**
   * Returns the number of available licenses.
   */
  public int getAvailableLicenses() {
    return counter;
  }
  /**
   * Method called by a thread to acquire the lock. If there are no resources available this will
   * wait until the lock has been released to re-attempt the acquire.
   */
  public synchronized void acquire() throws InterruptedException {
    while (counter == 0) {
      wait();
    }
    counter = counter - 1;
  }
  /**
   * Method called by a thread to release the lock.
   */
  public synchronized void release() {
    if (counter < licenses) {
      counter = counter + 1;
      notify();
    }
  }
 }
--- a/semaphore/src/test/java/com/iluwatar/semaphore/AppTest.java
+++ b/semaphore/src/test/java/com/iluwatar/semaphore/AppTest.java
@ -1,39 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 import org.junit.jupiter.api.Test;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 /**
 * Application Test Entrypoint
 */
 class AppTest {
  @Test
  void shouldExecuteWithoutException() {
    assertDoesNotThrow(() -> App.main(new String[]{}));
  }
 }
--- a/semaphore/src/test/java/com/iluwatar/semaphore/FruitBowlTest.java
+++ b/semaphore/src/test/java/com/iluwatar/semaphore/FruitBowlTest.java
@ -1,55 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import org.junit.jupiter.api.Test;
 /**
 * Test taking from and putting Fruit into a FruitBowl
 */
 public class FruitBowlTest {
  @Test
  public void fruitBowlTest() {
    var fbowl = new FruitBowl();
    assertEquals(0, fbowl.countFruit());
    for (var i = 1; i <= 10; i++) {
      fbowl.put(new Fruit(Fruit.FruitType.LEMON));
      assertEquals(i, fbowl.countFruit());
    }
    for (var i = 9; i >= 0; i--) {
      assertNotNull(fbowl.take());
      assertEquals(i, fbowl.countFruit());
    }
    assertNull(fbowl.take());
  }
 }
--- a/semaphore/src/test/java/com/iluwatar/semaphore/SemaphoreTest.java
+++ b/semaphore/src/test/java/com/iluwatar/semaphore/SemaphoreTest.java
@ -1,59 +0,0 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.semaphore;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.fail;
 import org.junit.jupiter.api.Test;
 /**
 * Test case for acquiring and releasing a Semaphore
 */
 public class SemaphoreTest {
  @Test
  public void acquireReleaseTest() {
    var sphore = new Semaphore(3);
    assertEquals(3, sphore.getAvailableLicenses());
    for (var i = 2; i >= 0; i--) {
      try {
        sphore.acquire();
        assertEquals(i, sphore.getAvailableLicenses());
      } catch (InterruptedException e) {
        fail(e.toString());
      }
    }
    for (var i = 1; i <= 3; i++) {
      sphore.release();
      assertEquals(i, sphore.getAvailableLicenses());
    }
    sphore.release();
    assertEquals(3, sphore.getAvailableLicenses());
  }
 }
--- a/special-case/pom.xml
+++ b/special-case/pom.xml
@ -1,4 +1,28 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
    The MIT License
    Copyright © 2014-2019 Ilkka Seppälä
    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:
    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.
    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
 -->
 <project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
--- a/special-case/src/main/java/com/iluwatar/specialcase/App.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/App.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import org.slf4j.Logger;
--- a/special-case/src/main/java/com/iluwatar/specialcase/ApplicationServices.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/ApplicationServices.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 public interface ApplicationServices {
--- a/special-case/src/main/java/com/iluwatar/specialcase/ApplicationServicesImpl.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/ApplicationServicesImpl.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 public class ApplicationServicesImpl implements ApplicationServices {
--- a/special-case/src/main/java/com/iluwatar/specialcase/Db.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/Db.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import java.util.HashMap;
--- a/special-case/src/main/java/com/iluwatar/specialcase/DomainServices.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/DomainServices.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 public interface DomainServices {
--- a/special-case/src/main/java/com/iluwatar/specialcase/DomainServicesImpl.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/DomainServicesImpl.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 public class DomainServicesImpl implements DomainServices {
--- a/special-case/src/main/java/com/iluwatar/specialcase/DownForMaintenance.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/DownForMaintenance.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import org.slf4j.Logger;
--- a/special-case/src/main/java/com/iluwatar/specialcase/InsufficientFunds.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/InsufficientFunds.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import org.slf4j.Logger;
--- a/special-case/src/main/java/com/iluwatar/specialcase/InvalidUser.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/InvalidUser.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import org.slf4j.Logger;
--- a/special-case/src/main/java/com/iluwatar/specialcase/MaintenanceLock.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/MaintenanceLock.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import org.slf4j.Logger;
--- a/special-case/src/main/java/com/iluwatar/specialcase/MoneyTransaction.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/MoneyTransaction.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 public class MoneyTransaction {
--- a/special-case/src/main/java/com/iluwatar/specialcase/OutOfStock.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/OutOfStock.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import org.slf4j.Logger;
--- a/special-case/src/main/java/com/iluwatar/specialcase/ReceiptDto.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/ReceiptDto.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import org.slf4j.Logger;
--- a/special-case/src/main/java/com/iluwatar/specialcase/ReceiptViewModel.java
+++ b/special-case/src/main/java/com/iluwatar/specialcase/ReceiptViewModel.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 public interface ReceiptViewModel {
--- a/special-case/src/test/java/com/iluwatar/specialcase/AppTest.java
+++ b/special-case/src/test/java/com/iluwatar/specialcase/AppTest.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
--- a/special-case/src/test/java/com/iluwatar/specialcase/SpecialCasesTest.java
+++ b/special-case/src/test/java/com/iluwatar/specialcase/SpecialCasesTest.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.specialcase;
 import static org.junit.jupiter.api.Assertions.assertEquals;
--- a/strategy/src/main/java/com/iluwatar/strategy/LambdaStrategy.java
+++ b/strategy/src/main/java/com/iluwatar/strategy/LambdaStrategy.java
@ -1,3 +1,26 @@
 /*
 * The MIT License
 * Copyright © 2014-2019 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.strategy;
 import org.slf4j.Logger;
Author	SHA1	Message	Date
allcontributors[bot]	b612de70c3	docs: update .all-contributorsrc [skip ci]	2021-01-26 20:22:04 +00:00
allcontributors[bot]	537da98f22	docs: update README.md [skip ci]	2021-01-26 20:22:03 +00:00
Rohit Singh	b9da15dda3	issue 1628 handled, removed mutex and semaphore from catalog. (#1634 ) * issue 1628 handled, removed mutex and semaphore from catalog. * issue1634, modules still exiting in pom.xml Co-authored-by: Subhrodip Mohanta <subhrodipmohanta@gmail.com>	2021-01-26 22:19:36 +02:00
Ilkka Seppälä	0010fb55c5	Merge data transfer object examples (#1635 ) * #1617 merge dto pattern examples * #1617 update license headers Co-authored-by: Subhrodip Mohanta <subhrodipmohanta@gmail.com>	2021-01-25 09:05:04 +05:30