/*
* 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
*
* 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 org.apache.stratos.messaging.listener;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.stratos.messaging.event.Event;
import java.util.Observable;
import java.util.Observer;
/**
* Event listener definition.
*/
public abstract class EventListener implements Observer {
private static final Log log = LogFactory.getLog(EventListener.class);
@Override
public void update(Observable o, Object arg) {
if(arg instanceof Event) {
Event event = (Event) arg;
if(log.isDebugEnabled()) {
log.debug(String.format("Event received: %s", event.getClass().getName()));
}
onEvent(event);
}
}
/**
* Triggered when an event is received.
* @param event
*/
protected abstract void onEvent(Event event);
}