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/*
* Copyright (C) 2007 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.eventbus;
import com.google.common.collect.Lists;
import junit.framework.TestCase;
import java.util.List;
/**
* Validate that {@link EventBus} behaves carefully when listeners publish
* their own events.
*
* @author Jesse Wilson
*/
public class ReentrantEventsTest extends TestCase {
static final String FIRST = "one";
static final Double SECOND = 2.0d;
final EventBus bus = new EventBus();
public void testNoReentrantEvents() {
ReentrantEventsHater hater = new ReentrantEventsHater();
bus.register(hater);
bus.post(FIRST);
assertEquals("ReentrantEventHater expected 2 events",
Lists.<Object>newArrayList(FIRST, SECOND), hater.eventsReceived);
}
public class ReentrantEventsHater {
boolean ready = true;
List<Object> eventsReceived = Lists.newArrayList();
@Subscribe
public void listenForStrings(String event) {
eventsReceived.add(event);
ready = false;
try {
bus.post(SECOND);
} finally {
ready = true;
}
}
@Subscribe
public void listenForDoubles(Double event) {
assertTrue("I received an event when I wasn't ready!", ready);
eventsReceived.add(event);
}
}
public void testEventOrderingIsPredictable() {
EventProcessor processor = new EventProcessor();
bus.register(processor);
EventRecorder recorder = new EventRecorder();
bus.register(recorder);
bus.post(FIRST);
assertEquals("EventRecorder expected events in order",
Lists.<Object>newArrayList(FIRST, SECOND), recorder.eventsReceived);
}
public class EventProcessor {
@Subscribe public void listenForStrings(String event) {
bus.post(SECOND);
}
}
public class EventRecorder {
List<Object> eventsReceived = Lists.newArrayList();
@Subscribe public void listenForEverything(Object event) {
eventsReceived.add(event);
}
}
}
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