/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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 eu.stratosphere.nephele.event.task;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import org.junit.Test;
/**
* This class contains unit tests for the {@link EventNotificationManager}.
*
*/
public class EventNotificationManagerTest {
/**
* A test implementation of an {@link EventListener}.
*
*/
private static class TestEventListener implements EventListener {
/**
* The event that was last received by this event listener.
*/
private AbstractTaskEvent receivedEvent = null;
/**
* {@inheritDoc}
*/
@Override
public void eventOccurred(AbstractTaskEvent event) {
this.receivedEvent = event;
}
/**
* Returns the event which was last received by this event listener. If no event
* has been received so far the return value is <code>null</code>.
*
* @return the event which was last received, possibly <code>null</code>
*/
public AbstractTaskEvent getLastReceivedEvent() {
return this.receivedEvent;
}
}
/**
* Tests the publish/subscribe mechanisms implemented in the {@link EventNotificationManager}.
*/
@Test
public void testEventNotificationManager() {
final EventNotificationManager evm = new EventNotificationManager();
final TestEventListener listener = new TestEventListener();
evm.subscribeToEvent(listener, StringTaskEvent.class);
final StringTaskEvent stringTaskEvent1 = new StringTaskEvent("Test 1");
final StringTaskEvent stringTaskEvent2 = new StringTaskEvent("Test 2");
evm.deliverEvent(stringTaskEvent1);
evm.deliverEvent(new IntegerTaskEvent(5));
assertNotNull(listener.getLastReceivedEvent());
StringTaskEvent receivedStringEvent = (StringTaskEvent) listener.getLastReceivedEvent();
assertEquals(stringTaskEvent1, receivedStringEvent);
evm.unsubscribeFromEvent(listener, StringTaskEvent.class);
evm.deliverEvent(stringTaskEvent2);
assertNotNull(listener.getLastReceivedEvent());
receivedStringEvent = (StringTaskEvent) listener.getLastReceivedEvent();
assertEquals(stringTaskEvent1, receivedStringEvent);
}
}