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