| /* |
| * 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 com.google.common.util.concurrent.ListenerCallQueue.Callback; |
| |
| import junit.framework.TestCase; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * Tests for {@link ListenerCallQueue}. |
| */ |
| public class ListenerCallQueueTest extends TestCase { |
| |
| private static final Callback<Object> THROWING_CALLBACK = new Callback<Object>("throwing()") { |
| @Override public void call(Object object) { |
| throw new RuntimeException(); |
| } |
| }; |
| |
| public void testAddAndExecute() { |
| Object listenerInstance = new Object(); |
| ListenerCallQueue<Object> queue = |
| new ListenerCallQueue<Object>(listenerInstance, MoreExecutors.sameThreadExecutor()); |
| |
| AtomicInteger counter = new AtomicInteger(); |
| queue.add(incrementingCallback(counter, 1)); |
| queue.add(incrementingCallback(counter, 2)); |
| queue.add(incrementingCallback(counter, 3)); |
| queue.add(incrementingCallback(counter, 4)); |
| assertEquals(0, counter.get()); |
| queue.execute(); |
| assertEquals(4, counter.get()); |
| } |
| |
| public void testAddAndExecute_withExceptions() { |
| Object listenerInstance = new Object(); |
| ListenerCallQueue<Object> queue = |
| new ListenerCallQueue<Object>(listenerInstance, MoreExecutors.sameThreadExecutor()); |
| |
| AtomicInteger counter = new AtomicInteger(); |
| queue.add(incrementingCallback(counter, 1)); |
| queue.add(THROWING_CALLBACK); |
| queue.add(incrementingCallback(counter, 2)); |
| queue.add(THROWING_CALLBACK); |
| queue.add(incrementingCallback(counter, 3)); |
| queue.add(THROWING_CALLBACK); |
| queue.add(incrementingCallback(counter, 4)); |
| queue.add(THROWING_CALLBACK); |
| assertEquals(0, counter.get()); |
| queue.execute(); |
| assertEquals(4, counter.get()); |
| } |
| |
| public void testAddAndExecute_multithreaded() throws InterruptedException { |
| ExecutorService service = Executors.newFixedThreadPool(4); |
| try { |
| ListenerCallQueue<Object> queue = |
| new ListenerCallQueue<Object>(new Object(), service); |
| |
| final CountDownLatch latch = new CountDownLatch(1); |
| AtomicInteger counter = new AtomicInteger(); |
| queue.add(incrementingCallback(counter, 1)); |
| queue.add(incrementingCallback(counter, 2)); |
| queue.add(incrementingCallback(counter, 3)); |
| queue.add(incrementingCallback(counter, 4)); |
| queue.add(countDownCallback(latch)); |
| assertEquals(0, counter.get()); |
| queue.execute(); |
| latch.await(); |
| assertEquals(4, counter.get()); |
| } finally { |
| service.shutdown(); |
| } |
| } |
| |
| public void testAddAndExecute_multithreaded_withThrowingRunnable() throws InterruptedException { |
| ExecutorService service = Executors.newFixedThreadPool(4); |
| try { |
| ListenerCallQueue<Object> queue = |
| new ListenerCallQueue<Object>(new Object(), service); |
| |
| final CountDownLatch latch = new CountDownLatch(1); |
| AtomicInteger counter = new AtomicInteger(); |
| queue.add(incrementingCallback(counter, 1)); |
| queue.add(THROWING_CALLBACK); |
| queue.add(incrementingCallback(counter, 2)); |
| queue.add(THROWING_CALLBACK); |
| queue.add(incrementingCallback(counter, 3)); |
| queue.add(THROWING_CALLBACK); |
| queue.add(incrementingCallback(counter, 4)); |
| queue.add(THROWING_CALLBACK); |
| queue.add(countDownCallback(latch)); |
| assertEquals(0, counter.get()); |
| queue.execute(); |
| latch.await(); |
| assertEquals(4, counter.get()); |
| } finally { |
| service.shutdown(); |
| } |
| } |
| |
| private Callback<Object> incrementingCallback(final AtomicInteger counter, final int expected) { |
| return new Callback<Object>("incrementing") { |
| @Override void call(Object listener) { |
| assertEquals(expected, counter.incrementAndGet()); |
| } |
| }; |
| } |
| |
| private Callback<Object> countDownCallback(final CountDownLatch latch) { |
| return new Callback<Object>("countDown") { |
| @Override void call(Object listener) { |
| latch.countDown(); |
| } |
| }; |
| } |
| } |