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 21 import junit.framework.TestCase; 22 23 import java.util.List; 24 25 /** 26 * Validate that {@link EventBus} behaves carefully when listeners publish 27 * their own events. 28 * 29 * @author Jesse Wilson 30 */ 31 public class ReentrantEventsTest extends TestCase { 32 33 static final String FIRST = "one"; 34 static final Double SECOND = 2.0d; 35 36 final EventBus bus = new EventBus(); 37 38 public void testNoReentrantEvents() { 39 ReentrantEventsHater hater = new ReentrantEventsHater(); 40 bus.register(hater); 41 42 bus.post(FIRST); 43 44 assertEquals("ReentrantEventHater expected 2 events", 45 Lists.<Object>newArrayList(FIRST, SECOND), hater.eventsReceived); 46 } 47 48 public class ReentrantEventsHater { 49 boolean ready = true; 50 List<Object> eventsReceived = Lists.newArrayList(); 51 52 @Subscribe 53 public void listenForStrings(String event) { 54 eventsReceived.add(event); 55 ready = false; 56 try { 57 bus.post(SECOND); 58 } finally { 59 ready = true; 60 } 61 } 62 63 @Subscribe 64 public void listenForDoubles(Double event) { 65 assertTrue("I received an event when I wasn't ready!", ready); 66 eventsReceived.add(event); 67 } 68 } 69 70 public void testEventOrderingIsPredictable() { 71 EventProcessor processor = new EventProcessor(); 72 bus.register(processor); 73 74 EventRecorder recorder = new EventRecorder(); 75 bus.register(recorder); 76 77 bus.post(FIRST); 78 79 assertEquals("EventRecorder expected events in order", 80 Lists.<Object>newArrayList(FIRST, SECOND), recorder.eventsReceived); 81 } 82 83 public class EventProcessor { 84 @Subscribe public void listenForStrings(String event) { 85 bus.post(SECOND); 86 } 87 } 88 89 public class EventRecorder { 90 List<Object> eventsReceived = Lists.newArrayList(); 91 @Subscribe public void listenForEverything(Object event) { 92 eventsReceived.add(event); 93 } 94 } 95 } 96
