Merge branch 'master' into business-delegate-explanation

business-delegate/README.md

@@ -9,21 +9,156 @@ tags:
 ---
 
 ## Intent
+
 The Business Delegate pattern adds an abstraction layer between
 presentation and business tiers. By using the pattern we gain loose coupling
 between the tiers and encapsulate knowledge about how to locate, connect to,
 and interact with the business objects that make up the application.
 
+## Explanation
+
+Real world example
+
+> A mobile phone application promises to stream any movie in existence to your phone. It captures
+> the user's search string and passes this on to the business delegate. The business delegate
+> selects the most suitable video streaming service and plays the video from there.
+
+In Plain Words
+
+> Business delegate adds an abstraction layer between the presentation and business tiers.
+
+Wikipedia says
+
+> Business delegate is a Java EE design pattern. This pattern is directing to reduce the coupling 
+> in between business services and the connected presentation tier, and to hide the implementation 
+> details of services (including lookup and accessibility of EJB architecture). Business delegates 
+> acts as an adaptor to invoke business objects from the presentation tier.
+
+**Programmatic Example**
+
+First, we have an abstraction for video streaming services and a couple of implementations.
+
+```java
+public interface VideoStreamingService {
+  void doProcessing();
+}
+
+@Slf4j
+public class NetflixService implements VideoStreamingService {
+  @Override
+  public void doProcessing() {
+    LOGGER.info("NetflixService is now processing");
+  }
+}
+
+@Slf4j
+public class YouTubeService implements VideoStreamingService {
+  @Override
+  public void doProcessing() {
+    LOGGER.info("YouTubeService is now processing");
+  }
+}
+```
+
+Then we have a lookup service that decides which video streaming service is used.
+
+```java
+@Setter
+public class BusinessLookup {
+
+  private NetflixService netflixService;
+  private YouTubeService youTubeService;
+
+  public VideoStreamingService getBusinessService(String movie) {
+    if (movie.toLowerCase(Locale.ROOT).contains("die hard")) {
+      return netflixService;
+    } else {
+      return youTubeService;
+    }
+  }
+}
+```
+
+The business delegate uses a business lookup to route movie playback requests to a suitable
+video streaming service.
+
+```java
+@Setter
+public class BusinessDelegate {
+
+  private BusinessLookup lookupService;
+
+  public void playbackMovie(String movie) {
+    VideoStreamingService videoStreamingService = lookupService.getBusinessService(movie);
+    videoStreamingService.doProcessing();
+  }
+}
+```
+
+The mobile client utilizes business delegate to call the business tier.
+
+```java
+public class MobileClient {
+
+  private final BusinessDelegate businessDelegate;
+
+  public MobileClient(BusinessDelegate businessDelegate) {
+    this.businessDelegate = businessDelegate;
+  }
+
+  public void playbackMovie(String movie) {
+    businessDelegate.playbackMovie(movie);
+  }
+}
+```
+
+Finally, we can show the full example in action.
+
+```java
+  public static void main(String[] args) {
+
+    // prepare the objects
+    var businessDelegate = new BusinessDelegate();
+    var businessLookup = new BusinessLookup();
+    businessLookup.setNetflixService(new NetflixService());
+    businessLookup.setYouTubeService(new YouTubeService());
+    businessDelegate.setLookupService(businessLookup);
+
+    // create the client and use the business delegate
+    var client = new MobileClient(businessDelegate);
+    client.playbackMovie("Die Hard 2");
+    client.playbackMovie("Maradona: The Greatest Ever");
+  }
+```
+
+Here is the console output.
+
+```
+21:15:33.790 [main] INFO com.iluwatar.business.delegate.NetflixService - NetflixService is now processing
+21:15:33.794 [main] INFO com.iluwatar.business.delegate.YouTubeService - YouTubeService is now processing
+```
+
 ## Class diagram
-![alt text](./etc/business-delegate.png "Business Delegate")
+
+![alt text](./etc/business-delegate.urm.png "Business Delegate")
+
+## Related patterns
+
+* [Service locator pattern](https://java-design-patterns.com/patterns/service-locator/)
 
 ## Applicability
+
 Use the Business Delegate pattern when
 
-* you want loose coupling between presentation and business tiers
+* You want loose coupling between presentation and business tiers
-* you want to orchestrate calls to multiple business services
+* You want to orchestrate calls to multiple business services
-* you want to encapsulate service lookups and service calls
+* You want to encapsulate service lookups and service calls
+
+## Tutorials
+
+* [Business Delegate Pattern at TutorialsPoint](https://www.tutorialspoint.com/design_pattern/business_delegate_pattern.htm)
 
 ## Credits
 
 * [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=48d37c67fb3d845b802fa9b619ad8f31)
+* [Core J2EE Patterns: Best Practices and Design Strategies](https://www.amazon.com/gp/product/0130648841/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=javadesignpat-20&creative=9325&linkCode=as2&creativeASIN=0130648841&linkId=a0100de2b28c71ede8db1757fb2b5947)

business-delegate/etc/business-delegate.ucls

@@ -1,136 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<class-diagram version="1.1.8" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true" 
-  realizations="true" associations="true" dependencies="false" nesting-relationships="true">  
-  <class id="1" language="java" name="com.iluwatar.business.delegate.BusinessDelegate" project="business-delegate" 
-    file="/business-delegate/src/main/java/com/iluwatar/business/delegate/BusinessDelegate.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="272" y="219"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </class>  
-  <class id="2" language="java" name="com.iluwatar.business.delegate.Client" project="business-delegate" 
-    file="/business-delegate/src/main/java/com/iluwatar/business/delegate/Client.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="272" y="64"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </class>  
-  <enumeration id="3" language="java" name="com.iluwatar.business.delegate.ServiceType" project="business-delegate" 
-    file="/business-delegate/src/main/java/com/iluwatar/business/delegate/ServiceType.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="89" y="383"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </enumeration>  
-  <interface id="4" language="java" name="com.iluwatar.business.delegate.BusinessService" project="business-delegate" 
-    file="/business-delegate/src/main/java/com/iluwatar/business/delegate/BusinessService.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="630" y="365"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </interface>  
-  <class id="5" language="java" name="com.iluwatar.business.delegate.JmsService" project="business-delegate" 
-    file="/business-delegate/src/main/java/com/iluwatar/business/delegate/JmsService.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="489" y="210"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </class>  
-  <class id="6" language="java" name="com.iluwatar.business.delegate.BusinessLookup" project="business-delegate" 
-    file="/business-delegate/src/main/java/com/iluwatar/business/delegate/BusinessLookup.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="360" y="399"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </class>  
-  <class id="7" language="java" name="com.iluwatar.business.delegate.EjbService" project="business-delegate" 
-    file="/business-delegate/src/main/java/com/iluwatar/business/delegate/EjbService.java" binary="false" 
-    corner="BOTTOM_RIGHT">    
-    <position height="-1" width="-1" x="668" y="210"/>    
-    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-      sort-features="false" accessors="true" visibility="true">      
-      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
-      <operations public="true" package="true" protected="true" private="true" static="true"/>    
-    </display>  
-  </class>  
-  <realization id="8">    
-    <end type="SOURCE" refId="7"/>    
-    <end type="TARGET" refId="4"/>  
-  </realization>  
-  <association id="9">    
-    <end type="SOURCE" refId="1" navigable="false">      
-      <attribute id="10" name="lookupService">        
-        <position height="0" width="0" x="0" y="0"/>      
-      </attribute>      
-      <multiplicity id="11" minimum="0" maximum="1">        
-        <position height="0" width="0" x="0" y="0"/>      
-      </multiplicity>    
-    </end>    
-    <end type="TARGET" refId="6" navigable="true"/>    
-    <display labels="true" multiplicity="true"/>  
-  </association>  
-  <association id="12">    
-    <end type="SOURCE" refId="1" navigable="false">      
-      <attribute id="13" name="serviceType">        
-        <position height="0" width="0" x="0" y="0"/>      
-      </attribute>      
-      <multiplicity id="14" minimum="0" maximum="1">        
-        <position height="0" width="0" x="0" y="0"/>      
-      </multiplicity>    
-    </end>    
-    <end type="TARGET" refId="3" navigable="true"/>    
-    <display labels="true" multiplicity="true"/>  
-  </association>  
-  <realization id="15">    
-    <end type="SOURCE" refId="5"/>    
-    <end type="TARGET" refId="4"/>  
-  </realization>  
-  <association id="16">    
-    <end type="SOURCE" refId="2" navigable="false">      
-      <attribute id="17" name="businessDelegate">        
-        <position height="0" width="0" x="0" y="0"/>      
-      </attribute>      
-      <multiplicity id="18" minimum="0" maximum="1">        
-        <position height="0" width="0" x="0" y="0"/>      
-      </multiplicity>    
-    </end>    
-    <end type="TARGET" refId="1" navigable="true"/>    
-    <display labels="true" multiplicity="true"/>  
-  </association>  
-  <association id="19">    
-    <end type="SOURCE" refId="1" navigable="false">      
-      <attribute id="20" name="businessService">        
-        <position height="0" width="0" x="0" y="0"/>      
-      </attribute>      
-      <multiplicity id="21" minimum="0" maximum="1">        
-        <position height="0" width="0" x="0" y="0"/>      
-      </multiplicity>    
-    </end>    
-    <end type="TARGET" refId="4" navigable="true"/>    
-    <display labels="true" multiplicity="true"/>  
-  </association>  
-  <classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
-    sort-features="false" accessors="true" visibility="true">    
-    <attributes public="true" package="true" protected="true" private="true" static="true"/>    
-    <operations public="true" package="true" protected="true" private="true" static="true"/>  
-  </classifier-display>  
-  <association-display labels="true" multiplicity="true"/>
-</class-diagram>

business-delegate/etc/business-delegate.urm.puml

@@ -5,53 +5,42 @@ package com.iluwatar.business.delegate {
     + main(args : String[]) {static}
   }
   class BusinessDelegate {
-    - businessService : BusinessService
     - lookupService : BusinessLookup
-    - serviceType : ServiceType
     + BusinessDelegate()
-    + doTask()
+    + playbackMovie(movie : String)
-    + setLookupService(businessLookup : BusinessLookup)
+    + setLookupService(lookupService : BusinessLookup)
-    + setServiceType(serviceType : ServiceType)
   }
   class BusinessLookup {
-    - ejbService : EjbService
+    - netflixService : NetflixService
-    - jmsService : JmsService
+    - youTubeService : YouTubeService
     + BusinessLookup()
-    + getBusinessService(serviceType : ServiceType) : BusinessService
+    + getBusinessService(movie : String) : VideoStreamingService
-    + setEjbService(ejbService : EjbService)
+    + setNetflixService(netflixService : NetflixService)
-    + setJmsService(jmsService : JmsService)
+    + setYouTubeService(youTubeService : YouTubeService)
   }
-  interface BusinessService {
+  class MobileClient {
+    - businessDelegate : BusinessDelegate
+    + MobileClient(businessDelegate : BusinessDelegate)
+    + playbackMovie(movie : String)
+  }
+  class NetflixService {
+    - LOGGER : Logger {static}
+    + NetflixService()
+    + doProcessing()
+  }
+  interface VideoStreamingService {
     + doProcessing() {abstract}
   }
-  class Client {
+  class YouTubeService {
-    - businessDelegate : BusinessDelegate
-    + Client(businessDelegate : BusinessDelegate)
-    + doTask()
-  }
-  class EjbService {
     - LOGGER : Logger {static}
-    + EjbService()
+    + YouTubeService()
     + doProcessing()
   }
-  class JmsService {
-    - LOGGER : Logger {static}
-    + JmsService()
-    + doProcessing()
 }
-  enum ServiceType {
+BusinessLookup -->  "-netflixService" NetflixService
-    + EJB {static}
+BusinessLookup -->  "-youTubeService" YouTubeService
-    + JMS {static}
+MobileClient -->  "-businessDelegate" BusinessDelegate
-    + valueOf(name : String) : ServiceType {static}
-    + values() : ServiceType[] {static}
-  }
-}
-BusinessLookup -->  "-ejbService" EjbService
-BusinessDelegate -->  "-serviceType" ServiceType
-Client -->  "-businessDelegate" BusinessDelegate
-BusinessDelegate -->  "-businessService" BusinessService
 BusinessDelegate -->  "-lookupService" BusinessLookup
-BusinessLookup -->  "-jmsService" JmsService
+NetflixService ..|> VideoStreamingService 
-EjbService ..|> BusinessService 
+YouTubeService ..|> VideoStreamingService 
-JmsService ..|> BusinessService 
 @enduml

business-delegate/src/main/java/com/iluwatar/business/delegate/App.java

@@ -33,9 +33,9 @@ package com.iluwatar.business.delegate;
  * retrieved through service lookups. The Business Delegate itself may contain business logic too
  * potentially tying together multiple service calls, exception handling, retrying etc.
  *
- * <p>In this example the client ({@link Client}) utilizes a business delegate (
+ * <p>In this example the client ({@link MobileClient}) utilizes a business delegate (
- * {@link BusinessDelegate}) to execute a task. The Business Delegate then selects the appropriate
+ * {@link BusinessDelegate}) to search for movies in video streaming services. The Business Delegate
- * service and makes the service call.
+ * then selects the appropriate service and makes the service call.
  */
 public class App {
 
@@ -46,18 +46,16 @@ public class App {
    */
   public static void main(String[] args) {
 
+    // prepare the objects
     var businessDelegate = new BusinessDelegate();
     var businessLookup = new BusinessLookup();
-    businessLookup.setEjbService(new EjbService());
+    businessLookup.setNetflixService(new NetflixService());
-    businessLookup.setJmsService(new JmsService());
+    businessLookup.setYouTubeService(new YouTubeService());
-
     businessDelegate.setLookupService(businessLookup);
-    businessDelegate.setServiceType(ServiceType.EJB);
 
-    var client = new Client(businessDelegate);
+    // create the client and use the business delegate
-    client.doTask();
+    var client = new MobileClient(businessDelegate);
-
+    client.playbackMovie("Die Hard 2");
-    businessDelegate.setServiceType(ServiceType.JMS);
+    client.playbackMovie("Maradona: The Greatest Ever");
-    client.doTask();
   }
 }

business-delegate/src/main/java/com/iluwatar/business/delegate/BusinessDelegate.java

@@ -23,24 +23,18 @@
 
 package com.iluwatar.business.delegate;
 
+import lombok.Setter;
+
 /**
  * BusinessDelegate separates the presentation and business tiers.
  */
+@Setter
 public class BusinessDelegate {
 
   private BusinessLookup lookupService;
-  private ServiceType serviceType;
 
-  public void setLookupService(BusinessLookup businessLookup) {
+  public void playbackMovie(String movie) {
-    this.lookupService = businessLookup;
+    VideoStreamingService videoStreamingService = lookupService.getBusinessService(movie);
-  }
+    videoStreamingService.doProcessing();
-
-  public void setServiceType(ServiceType serviceType) {
-    this.serviceType = serviceType;
-  }
-
-  public void doTask() {
-    BusinessService businessService = lookupService.getBusinessService(serviceType);
-    businessService.doProcessing();
   }
 }

business-delegate/src/main/java/com/iluwatar/business/delegate/BusinessLookup.java

@@ -23,6 +23,7 @@
 
 package com.iluwatar.business.delegate;
 
+import java.util.Locale;
 import lombok.Setter;
 
 /**
@@ -31,21 +32,21 @@ import lombok.Setter;
 @Setter
 public class BusinessLookup {
 
-  private EjbService ejbService;
+  private NetflixService netflixService;
 
-  private JmsService jmsService;
+  private YouTubeService youTubeService;
 
   /**
-   * Gets service instance based on service type.
+   * Gets service instance based on given movie search string.
    *
-   * @param serviceType Type of service instance to be returned.
+   * @param movie Search string for the movie.
    * @return Service instance.
    */
-  public BusinessService getBusinessService(ServiceType serviceType) {
+  public VideoStreamingService getBusinessService(String movie) {
-    if (serviceType.equals(ServiceType.EJB)) {
+    if (movie.toLowerCase(Locale.ROOT).contains("die hard")) {
-      return ejbService;
+      return netflixService;
     } else {
-      return jmsService;
+      return youTubeService;
     }
   }
 }

business-delegate/src/main/java/com/iluwatar/business/delegate/MobileClient.java

@@ -24,17 +24,17 @@
 package com.iluwatar.business.delegate;
 
 /**
- * Client utilizes BusinessDelegate to call the business tier.
+ * MobileClient utilizes BusinessDelegate to call the business tier.
  */
-public class Client {
+public class MobileClient {
 
   private final BusinessDelegate businessDelegate;
 
-  public Client(BusinessDelegate businessDelegate) {
+  public MobileClient(BusinessDelegate businessDelegate) {
     this.businessDelegate = businessDelegate;
   }
 
-  public void doTask() {
+  public void playbackMovie(String movie) {
-    businessDelegate.doTask();
+    businessDelegate.playbackMovie(movie);
   }
 }

business-delegate/src/main/java/com/iluwatar/business/delegate/NetflixService.java

@@ -26,13 +26,13 @@ package com.iluwatar.business.delegate;
 import lombok.extern.slf4j.Slf4j;
 
 /**
- * Service EJB implementation.
+ * NetflixService implementation.
  */
 @Slf4j
-public class EjbService implements BusinessService {
+public class NetflixService implements VideoStreamingService {
 
   @Override
   public void doProcessing() {
-    LOGGER.info("EjbService is now processing");
+    LOGGER.info("NetflixService is now processing");
   }
 }

business-delegate/src/main/java/com/iluwatar/business/delegate/ServiceType.java

@@ -1,33 +0,0 @@
-/*
- * The MIT License
- * Copyright © 2014-2021 Ilkka Seppälä
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-package com.iluwatar.business.delegate;
-
-/**
- * Enumeration for service types.
- */
-public enum ServiceType {
-
-  EJB,
-  JMS
-}

business-delegate/src/main/java/com/iluwatar/business/delegate/VideoStreamingService.java

@@ -24,9 +24,9 @@
 package com.iluwatar.business.delegate;
 
 /**
- * Interface for service implementations.
+ * Interface for video streaming service implementations.
  */
-public interface BusinessService {
+public interface VideoStreamingService {
 
   void doProcessing();
 }

business-delegate/src/main/java/com/iluwatar/business/delegate/YouTubeService.java

@@ -26,13 +26,13 @@ package com.iluwatar.business.delegate;
 import lombok.extern.slf4j.Slf4j;
 
 /**
- * Service JMS implementation.
+ * YouTubeService implementation.
  */
 @Slf4j
-public class JmsService implements BusinessService {
+public class YouTubeService implements VideoStreamingService {
 
   @Override
   public void doProcessing() {
-    LOGGER.info("JmsService is now processing");
+    LOGGER.info("YouTubeService is now processing");
   }
 }

business-delegate/src/test/java/com/iluwatar/business/delegate/BusinessDelegateTest.java

@@ -26,25 +26,20 @@ package com.iluwatar.business.delegate;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
+
+import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
 /**
- * The Business Delegate pattern adds an abstraction layer between the presentation and business
+ * Tests for the {@link BusinessDelegate}
- * tiers. By using the pattern we gain loose coupling between the tiers. The Business Delegate
- * encapsulates knowledge about how to locate, connect to, and interact with the business objects
- * that make up the application.
- *
- * <p>Some of the services the Business Delegate uses are instantiated directly, and some can be
- * retrieved through service lookups. The Business Delegate itself may contain business logic too
- * potentially tying together multiple service calls, exception handling, retrying etc.
  */
 class BusinessDelegateTest {
 
-  private EjbService ejbService;
+  private NetflixService netflixService;
 
-  private JmsService jmsService;
+  private YouTubeService youTubeService;
 
   private BusinessDelegate businessDelegate;
 
@@ -54,19 +49,19 @@ class BusinessDelegateTest {
    */
   @BeforeEach
   public void setup() {
-    ejbService = spy(new EjbService());
+    netflixService = spy(new NetflixService());
-    jmsService = spy(new JmsService());
+    youTubeService = spy(new YouTubeService());
 
     BusinessLookup businessLookup = spy(new BusinessLookup());
-    businessLookup.setEjbService(ejbService);
+    businessLookup.setNetflixService(netflixService);
-    businessLookup.setJmsService(jmsService);
+    businessLookup.setYouTubeService(youTubeService);
 
     businessDelegate = spy(new BusinessDelegate());
     businessDelegate.setLookupService(businessLookup);
   }
 
   /**
-   * In this example the client ({@link Client}) utilizes a business delegate (
+   * In this example the client ({@link MobileClient}) utilizes a business delegate (
    * {@link BusinessDelegate}) to execute a task. The Business Delegate then selects the appropriate
    * service and makes the service call.
    */
@@ -74,26 +69,20 @@ class BusinessDelegateTest {
   void testBusinessDelegate() {
 
     // setup a client object
-    var client = new Client(businessDelegate);
+    var client = new MobileClient(businessDelegate);
-
-    // set the service type
-    businessDelegate.setServiceType(ServiceType.EJB);
 
     // action
-    client.doTask();
+    client.playbackMovie("Die hard");
 
-    // verifying that the businessDelegate was used by client during doTask() method.
+    // verifying that the businessDelegate was used by client during playbackMovie() method.
-    verify(businessDelegate).doTask();
+    verify(businessDelegate).playbackMovie(anyString());
-    verify(ejbService).doProcessing();
+    verify(netflixService).doProcessing();
-
-    // set the service type
-    businessDelegate.setServiceType(ServiceType.JMS);
 
     // action
-    client.doTask();
+    client.playbackMovie("Maradona");
 
     // verifying that the businessDelegate was used by client during doTask() method.
-    verify(businessDelegate, times(2)).doTask();
+    verify(businessDelegate, times(2)).playbackMovie(anyString());
-    verify(jmsService).doProcessing();
+    verify(youTubeService).doProcessing();
   }
 }