/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* 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 org.apache.ambari.server.events.publishers;
import org.apache.ambari.server.events.TaskEvent;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import com.google.inject.Singleton;
/**
* The {@link TaskEventPublisher} is used to publish instances of
* {@link TaskEvent} to any {@link com.google.common.eventbus.Subscribe} interested.
* It uses a single-threaded, serial {@link EventBus}.
*/
@Singleton
public class TaskEventPublisher {
/**
* A single threaded, synchronous event bus for processing task events.
*/
private final EventBus m_eventBus = new EventBus("ambari-task-report-event-bus");
/**
* Publishes the specified event to all registered listeners that
* {@link Subscribe} to {@link TaskEvent} instances.
*
* @param event {@link TaskEvent}
*/
public void publish(TaskEvent event) {
m_eventBus.post(event);
}
/**
* Register a listener to receive events. The listener should use the
* {@link Subscribe} annotation.
*
* @param object
* the listener to receive events.
*/
public void register(Object object) {
m_eventBus.register(object);
}
}