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Added cancellation example for CompletableFuture (#614)

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This commit is contained in:
Sergey Petunin 2016-08-16 13:42:14 +06:00 committed by Grzegorz Piwowarek
parent e4f2bed4fd
commit fe16518c17
1 changed files with 25 additions and 6 deletions
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31
core-java-8/src/test/java/com/baeldung/completablefuture/CompletableFutureTest.java
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@ -1,14 +1,11 @@
package com.baeldung.completablefuture;
import org.junit.Test;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
@ -46,6 +43,28 @@ public class CompletableFutureTest {
}
public Future<String> calculateAsyncWithCancellation() throws InterruptedException {
CompletableFuture<String> completableFuture = new CompletableFuture<>();
Executors.newCachedThreadPool().submit(() -> {
Thread.sleep(500);
completableFuture.cancel(false);
return null;
});
return completableFuture;
}
@Test(expected = CancellationException.class)
public void whenCancelingTheFuture_thenThrowsCancellationException() throws ExecutionException, InterruptedException {
Future<String> future = calculateAsyncWithCancellation();
future.get();
}
@Test
public void whenCreatingCompletableFutureWithSupplyAsync_thenFutureReturnsValue() throws ExecutionException, InterruptedException {