/*
    * 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);
      }
    }
  }