/*
* Copyright 2010 The Apache Software Foundation
*
* 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.hadoop.hbase;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.management.InstanceAlreadyExistsException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;
import java.lang.management.ManagementFactory;
/**
* Utilities for JMX.
*/
public final class JmxHelper {
static final Log LOG = LogFactory.getLog(JmxHelper.class);
private JmxHelper() {
// private constuctor for utility classes.
}
/**
* Registers an MBean with the platform MBean server. if an MBean with the
* same name exists it will be unregistered and the provided MBean would
* replace it
*
* @param objectName the object name
* @param mbean the mbean class
*/
public static void registerMBean(ObjectName objectName, Object mbean) {
final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
if (mbs.isRegistered(objectName)) {
try {
LOG.info("unregister: "+objectName);
mbs.unregisterMBean(objectName);
} catch (InstanceNotFoundException e) {
throw new IllegalStateException("mbean " + objectName +
" failed unregistration", e);
} catch (MBeanRegistrationException e) {
throw new IllegalStateException("mbean " + objectName +
" failed unregistration", e);
}
}
try {
LOG.info("register: " + objectName);
mbs.registerMBean(mbean, objectName);
} catch (InstanceAlreadyExistsException e) {
throw new IllegalStateException("mbean " + objectName +
" failed registration", e);
} catch (MBeanRegistrationException e) {
throw new IllegalStateException("mbean " + objectName +
" failed registration", e);
} catch (NotCompliantMBeanException e) {
throw new IllegalStateException("mbean " + objectName +
" failed registration", e);
}
}
}