package org.apache.helix.monitoring.mbeans;
/*
* 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.
*/
import java.io.IOException;
import java.lang.management.ManagementFactory;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanServerConnection;
import javax.management.MBeanServerDelegate;
import javax.management.MBeanServerNotification;
import javax.management.MalformedObjectNameException;
import javax.management.Notification;
import javax.management.NotificationListener;
import javax.management.relation.MBeanServerNotificationFilter;
import org.apache.log4j.Logger;
/*
* TODO: this class should be in espresso common, as the only usage of it is
* to create ingraph adaptors
* **/
public abstract class ClusterMBeanObserver implements NotificationListener {
protected final String _domain;
protected MBeanServerConnection _server;
private static final Logger _logger = Logger.getLogger(ClusterMBeanObserver.class);
public ClusterMBeanObserver(String domain) throws InstanceNotFoundException, IOException,
MalformedObjectNameException, NullPointerException {
// Get a reference to the target MBeanServer
_domain = domain;
_server = ManagementFactory.getPlatformMBeanServer();
MBeanServerNotificationFilter filter = new MBeanServerNotificationFilter();
filter.enableAllObjectNames();
_server.addNotificationListener(MBeanServerDelegate.DELEGATE_NAME, this, filter, null);
}
public void handleNotification(Notification notification, Object handback) {
MBeanServerNotification mbs = (MBeanServerNotification) notification;
if (MBeanServerNotification.REGISTRATION_NOTIFICATION.equals(mbs.getType())) {
if (mbs.getMBeanName().getDomain().equalsIgnoreCase(_domain)) {
_logger.info("MBean Registered, name :" + mbs.getMBeanName());
onMBeanRegistered(_server, mbs);
}
} else if (MBeanServerNotification.UNREGISTRATION_NOTIFICATION.equals(mbs.getType())) {
if (mbs.getMBeanName().getDomain().equalsIgnoreCase(_domain)) {
_logger.info("MBean Unregistered, name :" + mbs.getMBeanName());
onMBeanUnRegistered(_server, mbs);
}
}
}
public void disconnect() {
MBeanServerNotificationFilter filter = new MBeanServerNotificationFilter();
try {
_server.removeNotificationListener(MBeanServerDelegate.DELEGATE_NAME, this);
} catch (Exception e) {
_logger.error("", e);
}
}
public abstract void onMBeanRegistered(MBeanServerConnection server,
MBeanServerNotification mbsNotification);
public abstract void onMBeanUnRegistered(MBeanServerConnection server,
MBeanServerNotification mbsNotification);
}