EventHandler.java

/*
 * Copyright 2012 LinkedIn Corp.
 * 
 * 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 azkaban.execapp.event;

import java.util.ArrayList;
import java.util.HashSet;

public class EventHandler {
	private HashSet<EventListener> listeners = new HashSet<EventListener>();
	
	public EventHandler() {
	}

	public void addListener(EventListener listener) {
		listeners.add(listener);
	}
	
	public void fireEventListeners(Event event) {
		ArrayList<EventListener> listeners = new ArrayList<EventListener>(this.listeners);
		for (EventListener listener: listeners) {
			listener.handleEvent(event);
		}
	}
	
	public void removeListener(EventListener listener) {
		listeners.remove(listener);
	}
}