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TrustedListenableFutureTaskTest.java
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TrustedListenableFutureTaskTest.java
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/*
* Copyright (C) 2014 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.util.concurrent;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.util.concurrent.Callables.returning;
import static com.google.common.util.concurrent.Futures.getDone;
import static com.google.common.util.concurrent.TestPlatform.verifyThreadWasNotInterrupted;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import java.util.concurrent.Callable;
import java.util.concurrent.CancellationException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import junit.framework.TestCase;
import org.checkerframework.checker.nullness.qual.Nullable;
/** Test case for {@link TrustedListenableFutureTask}. */
@ElementTypesAreNonnullByDefault
@GwtCompatible(emulated = true)
public class TrustedListenableFutureTaskTest extends TestCase {
public void testSuccessful() throws Exception {
TrustedListenableFutureTask<Integer> task = TrustedListenableFutureTask.create(returning(2));
assertFalse(task.isDone());
task.run();
assertTrue(task.isDone());
assertFalse(task.isCancelled());
assertEquals(2, getDone(task).intValue());
}
public void testCancelled() throws Exception {
TrustedListenableFutureTask<Integer> task = TrustedListenableFutureTask.create(returning(2));
assertFalse(task.isDone());
task.cancel(false);
assertTrue(task.isDone());
assertTrue(task.isCancelled());
assertFalse(task.wasInterrupted());
try {
getDone(task);
fail();
} catch (CancellationException expected) {
}
verifyThreadWasNotInterrupted();
}
public void testFailed() throws Exception {
final Exception e = new Exception();
TrustedListenableFutureTask<Integer> task =
TrustedListenableFutureTask.create(
new Callable<Integer>() {
@Override
public Integer call() throws Exception {
throw e;
}
});
task.run();
assertTrue(task.isDone());
assertFalse(task.isCancelled());
try {
getDone(task);
fail();
} catch (ExecutionException executionException) {
assertThat(executionException).hasCauseThat().isEqualTo(e);
}
}
@J2ktIncompatible
@GwtIncompatible // blocking wait
public void testCancel_interrupted() throws Exception {
final AtomicBoolean interruptedExceptionThrown = new AtomicBoolean();
final CountDownLatch enterLatch = new CountDownLatch(1);
final CountDownLatch exitLatch = new CountDownLatch(1);
final TrustedListenableFutureTask<Integer> task =
TrustedListenableFutureTask.create(
new Callable<Integer>() {
@Override
public Integer call() throws Exception {
enterLatch.countDown();
try {
new CountDownLatch(1).await(); // wait forever
throw new AssertionError();
} catch (InterruptedException e) {
interruptedExceptionThrown.set(true);
throw e;
} finally {
}
}
});
assertFalse(task.isDone());
Thread thread =
new Thread(
new Runnable() {
@Override
public void run() {
try {
task.run();
} finally {
exitLatch.countDown();
}
}
});
thread.start();
enterLatch.await();
assertFalse(task.isDone());
task.cancel(true);
assertTrue(task.isDone());
assertTrue(task.isCancelled());
assertTrue(task.wasInterrupted());
try {
task.get();
fail();
} catch (CancellationException expected) {
}
exitLatch.await();
assertTrue(interruptedExceptionThrown.get());
}
@J2ktIncompatible
@GwtIncompatible // blocking wait
public void testRunIdempotency() throws Exception {
final int numThreads = 10;
final ExecutorService executor = Executors.newFixedThreadPool(numThreads);
for (int i = 0; i < 1000; i++) {
final AtomicInteger counter = new AtomicInteger();
final TrustedListenableFutureTask<Integer> task =
TrustedListenableFutureTask.create(
new Callable<Integer>() {
@Override
public Integer call() {
return counter.incrementAndGet();
}
});
final CyclicBarrier barrier = new CyclicBarrier(numThreads + 1);
Runnable wrapper =
new Runnable() {
@Override
public void run() {
awaitUnchecked(barrier);
task.run();
awaitUnchecked(barrier);
}
};
for (int j = 0; j < 10; j++) {
executor.execute(wrapper);
}
barrier.await(); // release the threads!
barrier.await(); // wait for them all to complete
assertEquals(1, task.get().intValue());
assertEquals(1, counter.get());
}
executor.shutdown();
}
@J2ktIncompatible
@GwtIncompatible // blocking wait
public void testToString() throws Exception {
final CountDownLatch enterLatch = new CountDownLatch(1);
final CountDownLatch exitLatch = new CountDownLatch(1);
final TrustedListenableFutureTask<@Nullable Void> task =
TrustedListenableFutureTask.create(
new Callable<@Nullable Void>() {
@Override
public @Nullable Void call() throws Exception {
enterLatch.countDown();
new CountDownLatch(1).await(); // wait forever
return null;
}
});
assertFalse(task.isDone());
Thread thread =
new Thread(
new Runnable() {
@Override
public void run() {
try {
task.run();
} finally {
exitLatch.countDown();
}
}
},
"Custom thread name");
thread.start();
enterLatch.await();
assertFalse(task.isDone());
String result = task.toString();
assertThat(result).contains("Custom thread name");
task.cancel(true);
exitLatch.await();
}
@J2ktIncompatible
@GwtIncompatible // used only in GwtIncompatible tests
private void awaitUnchecked(CyclicBarrier barrier) {
try {
barrier.await();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}