1 /* 2 * Copyright (C) 2007 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.eventbus; 18 19 import com.google.common.collect.Lists; 20 import java.util.List; 21 import java.util.concurrent.Executor; 22 import junit.framework.TestCase; 23 24 /** 25 * Test case for {@link AsyncEventBus}. 26 * 27 * @author Cliff Biffle 28 */ 29 public class AsyncEventBusTest extends TestCase { 30 private static final String EVENT = "Hello"; 31 32 /** The executor we use to fake asynchronicity. */ 33 private FakeExecutor executor; 34 private AsyncEventBus bus; 35 36 @Override protected void setUp() throws Exception { 37 super.setUp(); 38 executor = new FakeExecutor(); 39 bus = new AsyncEventBus(executor); 40 } 41 42 public void testBasicDistribution() { 43 StringCatcher catcher = new StringCatcher(); 44 bus.register(catcher); 45 46 // We post the event, but our Executor will not deliver it until instructed. 47 bus.post(EVENT); 48 49 List<String> events = catcher.getEvents(); 50 assertTrue("No events should be delivered synchronously.", 51 events.isEmpty()); 52 53 // Now we find the task in our Executor and explicitly activate it. 54 List<Runnable> tasks = executor.getTasks(); 55 assertEquals("One event dispatch task should be queued.", 1, tasks.size()); 56 57 tasks.get(0).run(); 58 59 assertEquals("One event should be delivered.", 1, events.size()); 60 assertEquals("Correct string should be delivered.", EVENT, events.get(0)); 61 } 62 63 /** 64 * An {@link Executor} wanna-be that simply records the tasks it's given. 65 * Arguably the Worst Executor Ever. 66 * 67 * @author cbiffle 68 * 69 */ 70 public static class FakeExecutor implements Executor { 71 List<Runnable> tasks = Lists.newArrayList(); 72 73 @Override 74 public void execute(Runnable task) { 75 tasks.add(task); 76 } 77 78 public List<Runnable> getTasks() { 79 return tasks; 80 } 81 } 82 83 } 84
