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/*
* Copyright (C) 2008 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.Futures.transformAsync;
import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
import static com.google.common.util.concurrent.Uninterruptibles.awaitUninterruptibly;
import static org.junit.Assert.assertThrows;
import com.google.common.util.concurrent.ForwardingListenableFuture.SimpleForwardingListenableFuture;
import java.util.concurrent.CancellationException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
/**
* Unit tests for {@link Futures#transformAsync(ListenableFuture, AsyncFunction, Executor)}.
*
* @author Nishant Thakkar
*/
public class FuturesTransformAsyncTest extends AbstractChainedListenableFutureTest<String> {
protected static final int SLOW_OUTPUT_VALID_INPUT_DATA = 2;
protected static final int SLOW_FUNC_VALID_INPUT_DATA = 3;
private static final String RESULT_DATA = "SUCCESS";
private SettableFuture<String> outputFuture;
// Signals that the function is waiting to complete
private CountDownLatch funcIsWaitingLatch;
// Signals the function so it will complete
private CountDownLatch funcCompletionLatch;
@Override
protected ListenableFuture<String> buildChainingFuture(ListenableFuture<Integer> inputFuture) {
outputFuture = SettableFuture.create();
funcIsWaitingLatch = new CountDownLatch(1);
funcCompletionLatch = new CountDownLatch(1);
return transformAsync(inputFuture, new ChainingFunction(), directExecutor());
}
@Override
protected String getSuccessfulResult() {
return RESULT_DATA;
}
private class ChainingFunction implements AsyncFunction<Integer, String> {
@Override
public ListenableFuture<String> apply(Integer input) throws Exception {
switch (input) {
case VALID_INPUT_DATA:
outputFuture.set(RESULT_DATA);
break;
case SLOW_OUTPUT_VALID_INPUT_DATA:
break; // do nothing to the result
case SLOW_FUNC_VALID_INPUT_DATA:
funcIsWaitingLatch.countDown();
awaitUninterruptibly(funcCompletionLatch);
break;
case EXCEPTION_DATA:
throw EXCEPTION;
}
return outputFuture;
}
}
public void testFutureGetThrowsFunctionException() throws Exception {
inputFuture.set(EXCEPTION_DATA);
listener.assertException(EXCEPTION);
}
public void testFutureGetThrowsCancellationIfInputCancelled() throws Exception {
inputFuture.cancel(true); // argument is ignored
assertThrows(CancellationException.class, () -> resultFuture.get());
}
public void testFutureGetThrowsCancellationIfOutputCancelled() throws Exception {
inputFuture.set(SLOW_OUTPUT_VALID_INPUT_DATA);
outputFuture.cancel(true); // argument is ignored
assertThrows(CancellationException.class, () -> resultFuture.get());
}
public void testAsyncToString() throws Exception {
inputFuture.set(SLOW_OUTPUT_VALID_INPUT_DATA);
assertThat(resultFuture.toString()).contains(outputFuture.toString());
}
public void testFutureCancelBeforeInputCompletion() throws Exception {
assertTrue(resultFuture.cancel(true));
assertTrue(resultFuture.isCancelled());
assertTrue(inputFuture.isCancelled());
assertFalse(outputFuture.isCancelled());
assertThrows(CancellationException.class, () -> resultFuture.get());
}
public void testFutureCancellableBeforeOutputCompletion() throws Exception {
inputFuture.set(SLOW_OUTPUT_VALID_INPUT_DATA);
assertTrue(resultFuture.cancel(true));
assertTrue(resultFuture.isCancelled());
assertFalse(inputFuture.isCancelled());
assertTrue(outputFuture.isCancelled());
assertThrows(CancellationException.class, () -> resultFuture.get());
}
public void testFutureCancellableBeforeFunctionCompletion() throws Exception {
// Set the result in a separate thread since this test runs the function
// (which will block) in the same thread.
new Thread() {
@Override
public void run() {
inputFuture.set(SLOW_FUNC_VALID_INPUT_DATA);
}
}.start();
funcIsWaitingLatch.await();
assertTrue(resultFuture.cancel(true));
assertTrue(resultFuture.isCancelled());
assertFalse(inputFuture.isCancelled());
assertFalse(outputFuture.isCancelled());
assertThrows(CancellationException.class, () -> resultFuture.get());
funcCompletionLatch.countDown(); // allow the function to complete
assertThrows(CancellationException.class, () -> outputFuture.get());
}
public void testFutureCancelAfterCompletion() throws Exception {
inputFuture.set(VALID_INPUT_DATA);
assertFalse(resultFuture.cancel(true));
assertFalse(resultFuture.isCancelled());
assertFalse(inputFuture.isCancelled());
assertFalse(outputFuture.isCancelled());
assertEquals(RESULT_DATA, resultFuture.get());
}
public void testFutureGetThrowsRuntimeException() throws Exception {
BadFuture badInput = new BadFuture(Futures.immediateFuture(20));
ListenableFuture<String> chain = buildChainingFuture(badInput);
ExecutionException e = assertThrows(ExecutionException.class, () -> chain.get());
assertSame(RuntimeException.class, e.getCause().getClass());
}
/** Proxy to throw a {@link RuntimeException} out of the {@link #get()} method. */
public static class BadFuture extends SimpleForwardingListenableFuture<Integer> {
protected BadFuture(ListenableFuture<Integer> delegate) {
super(delegate);
}
@Override
public Integer get() {
throw new RuntimeException("Oops");
}
}
}
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