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Java example source code file (ReentrantEventsTest.java)

This example Java source code file (ReentrantEventsTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

double, eventbus, eventprocessor, eventrecorder, first, list, reentranteventhater, reentranteventshater, reentranteventstest, second, string, subscribe, testcase, util

The ReentrantEventsTest.java Java example source code

/*
 * 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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