| /* |
| * 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 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 javax.annotation.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) { |
| assertEquals(message, e.getCause().getMessage()); |
| } |
| } |
| } |