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/*
* Copyright (C) 2009 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.base.Preconditions.checkNotNull;
import static com.google.common.truth.Truth.assertThat;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertFalse;
import static junit.framework.Assert.assertTrue;
import static junit.framework.Assert.fail;
import java.util.concurrent.CancellationException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Used to test listenable future implementations.
*
* @author Sven Mawson
*/
public class ListenableFutureTester {
private final ExecutorService exec;
private final ListenableFuture<?> future;
private final CountDownLatch latch;
public ListenableFutureTester(ListenableFuture<?> future) {
this.exec = Executors.newCachedThreadPool();
this.future = checkNotNull(future);
this.latch = new CountDownLatch(1);
}
public void setUp() {
future.addListener(
new Runnable() {
@Override
public void run() {
latch.countDown();
}
},
exec);
assertEquals(1, latch.getCount());
assertFalse(future.isDone());
assertFalse(future.isCancelled());
}
public void tearDown() {
exec.shutdown();
}
public void testCompletedFuture(@Nullable Object expectedValue)
throws InterruptedException, ExecutionException {
assertTrue(future.isDone());
assertFalse(future.isCancelled());
assertTrue(latch.await(5, TimeUnit.SECONDS));
assertTrue(future.isDone());
assertFalse(future.isCancelled());
assertEquals(expectedValue, future.get());
}
public void testCancelledFuture() throws InterruptedException, ExecutionException {
assertTrue(future.isDone());
assertTrue(future.isCancelled());
assertTrue(latch.await(5, TimeUnit.SECONDS));
assertTrue(future.isDone());
assertTrue(future.isCancelled());
try {
future.get();
fail("Future should throw CancellationException on cancel.");
} catch (CancellationException expected) {
}
}
public void testFailedFuture(@Nullable String message) throws InterruptedException {
assertTrue(future.isDone());
assertFalse(future.isCancelled());
assertTrue(latch.await(5, TimeUnit.SECONDS));
assertTrue(future.isDone());
assertFalse(future.isCancelled());
try {
future.get();
fail("Future should rethrow the exception.");
} catch (ExecutionException e) {
assertThat(e).hasCauseThat().hasMessageThat().isEqualTo(message);
}
}
}
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