BAEL-7713 - add example merging async services response (#16280)
* BAEL-7713 - add example merging async services response * BAEL-7713 update test class naming convention
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package com.baeldung.async;
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import java.util.concurrent.CompletableFuture;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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@Service
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public class AsyncService {
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@Autowired
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private FirstAsyncService fisrtService;
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@Autowired
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private SecondAsyncService secondService;
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public CompletableFuture<String> asyncMergeServicesResponse() throws InterruptedException {
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CompletableFuture<String> fisrtServiceResponse = fisrtService.asyncGetData();
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CompletableFuture<String> secondServiceResponse = secondService.asyncGetData();
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// Merge responses from FirstAsyncService and SecondAsyncService
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return fisrtServiceResponse.thenCompose(fisrtServiceValue -> secondServiceResponse.thenApply(secondServiceValue -> fisrtServiceValue + secondServiceValue));
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}
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}
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package com.baeldung.async;
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import java.util.concurrent.CompletableFuture;
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import org.springframework.scheduling.annotation.Async;
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import org.springframework.scheduling.annotation.AsyncResult;
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import org.springframework.stereotype.Service;
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@Service
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public class FirstAsyncService {
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@Async
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public CompletableFuture<String> asyncGetData() throws InterruptedException {
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System.out.println("Execute method asynchronously " + Thread.currentThread()
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.getName());
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Thread.sleep(4000);
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return new AsyncResult<>(super.getClass().getSimpleName() + " response !!! ").completable();
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}
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}
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package com.baeldung.async;
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import java.util.concurrent.CompletableFuture;
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import org.springframework.scheduling.annotation.Async;
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import org.springframework.scheduling.annotation.AsyncResult;
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import org.springframework.stereotype.Service;
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@Service
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public class SecondAsyncService {
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@Async
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public CompletableFuture<String> asyncGetData() throws InterruptedException {
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System.out.println("Execute method asynchronously " + Thread.currentThread()
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.getName());
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Thread.sleep(4000);
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return new AsyncResult<>(super.getClass().getSimpleName() + " response !!! ").completable();
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}
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}
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package com.baeldung.async;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.ExecutionException;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.test.context.ContextConfiguration;
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import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
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import org.springframework.test.context.support.AnnotationConfigContextLoader;
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import com.baeldung.async.config.SpringAsyncConfig;
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@RunWith(SpringJUnit4ClassRunner.class)
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@ContextConfiguration(classes = { SpringAsyncConfig.class }, loader = AnnotationConfigContextLoader.class)
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public class AsyncServiceUnitTest {
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@Autowired
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private AsyncService asyncServiceExample;
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// tests
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@Test
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public void testAsyncAnnotationForMergedServicesResponse() throws InterruptedException, ExecutionException {
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System.out.println("Invoking an asynchronous method. " + Thread.currentThread()
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.getName());
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CompletableFuture<String> completableFuture = asyncServiceExample.asyncMergeServicesResponse();
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while (true) {
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if (completableFuture.isDone()) {
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System.out.println("Result from asynchronous process - " + completableFuture.get());
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break;
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}
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System.out.println("Continue doing something else. ");
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Thread.sleep(1000);
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}
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}
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}
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