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docs: #590 refactor and add explanation for business delegate (#1686)

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Type: docs and refactoring

Co-authored-by: Subhrodip Mohanta <hello@subho.xyz>
This commit is contained in:
Ilkka Seppälä
2021-03-22 08:34:56 +02:00
committed by GitHub
parent 794795acf5
commit 7ac468db20
14 changed files with 220 additions and 283 deletions
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47
business-delegate/src/test/java/com/iluwatar/business/delegate/BusinessDelegateTest.java
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@ -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
* 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.
* Tests for the {@link BusinessDelegate}
*/
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());
jmsService = spy(new JmsService());
netflixService = spy(new NetflixService());
youTubeService = spy(new YouTubeService());
BusinessLookup businessLookup = spy(new BusinessLookup());
businessLookup.setEjbService(ejbService);
businessLookup.setJmsService(jmsService);
businessLookup.setNetflixService(netflixService);
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);
// set the service type
businessDelegate.setServiceType(ServiceType.EJB);
var client = new MobileClient(businessDelegate);
// action
client.doTask();
client.playbackMovie("Die hard");
// verifying that the businessDelegate was used by client during doTask() method.
verify(businessDelegate).doTask();
verify(ejbService).doProcessing();
// set the service type
businessDelegate.setServiceType(ServiceType.JMS);
// verifying that the businessDelegate was used by client during playbackMovie() method.
verify(businessDelegate).playbackMovie(anyString());
verify(netflixService).doProcessing();
// action
client.doTask();
client.playbackMovie("Maradona");
// verifying that the businessDelegate was used by client during doTask() method.
verify(businessDelegate, times(2)).doTask();
verify(jmsService).doProcessing();
verify(businessDelegate, times(2)).playbackMovie(anyString());
verify(youTubeService).doProcessing();
}
}