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Groovy: A powerful, dynamic language for the JVM
/**
* 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 groovy.jmx.builder;
import groovy.lang.Closure;
import javax.management.Notification;
import javax.management.NotificationListener;
import java.util.HashMap;
import java.util.Map;
/**
* The JmxEventListener class is used by the builder to listen to events on the event bus. It is used internally
* by JmxBuilder to handle attribute-change and operation-invoke events on the bean() node.
*
* @author Vladimir Vivien
* @see groovy.jmx.builder.JmxBeanFactory
*/
public class JmxEventListener implements NotificationListener {
private static JmxEventListener listener;
/**
* Factory method that returns an instance of the listener.
*
* @return - JmxEventListener instance.
*/
public static synchronized JmxEventListener getListener() {
if (listener == null) {
listener = new JmxEventListener();
}
return listener;
}
/**
* This is the implemented method for NotificationListener. It is called by an event emitter to dispatch
* JMX events to listeners. Here it handles internal JmxBuilder events.
*
* @param notification the notification object passed to closure used to handle JmxBuilder events.
* @param handback - In this case, the handback is the closure to execute when the event is handled.
*/
public void handleNotification(Notification notification, Object handback) {
Map event = (Map) handback;
if (event != null) {
Object del = event.get("managedObject");
Object callback = event.get("callback");
if (callback != null && callback instanceof Closure) {
Closure closure = (Closure) callback;
closure.setDelegate(del);
if (closure.getMaximumNumberOfParameters() == 1)
closure.call(buildOperationNotificationPacket(notification));
else closure.call();
}
}
}
private static Map buildOperationNotificationPacket(Notification note) {
Map result = new HashMap();
result.put("event", note.getType());
result.put("source", note.getSource());
result.put("sequenceNumber", note.getSequenceNumber());
result.put("timeStamp", note.getTimeStamp());
result.put("data", note.getUserData());
return result;
}
}