/*
* 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.synapse.commons.jmx;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.commons.SynapseCommonsException;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import java.lang.management.ManagementFactory;
import java.util.Set;
public class MBeanRegistrar {
private static final MBeanRegistrar ourInstance = new MBeanRegistrar();
private static final Log log = LogFactory.getLog(MBeanRegistrar.class);
public static MBeanRegistrar getInstance() {
return ourInstance;
}
private MBeanRegistrar() {
}
public void registerMBean(Object mBeanInstance, String category, String id) {
assertNull(mBeanInstance, "MBean instance is null");
assertNull(category, "MBean instance category is null");
assertNull(id, "MBean instance name is null");
try {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName name = new ObjectName(getObjectName(category, id));
Set set = mbs.queryNames(name, null);
if (set != null && set.isEmpty()) {
mbs.registerMBean(mBeanInstance, name);
} else {
mbs.unregisterMBean(name);
mbs.registerMBean(mBeanInstance, name);
}
} catch (Exception e) {
log.warn("Error registering a MBean with name ' " + id +
" ' and category name ' " + category + "' for JMX management", e);
}
}
public void unRegisterMBean(String category, String id) {
try {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName objName = new ObjectName(getObjectName(category, id));
if (mbs.isRegistered(objName)) {
mbs.unregisterMBean(objName);
}
} catch (Exception e) {
log.warn("Error un-registering a MBean with name ' " + id +
" ' and category name ' " + category + "' for JMX management", e);
}
}
private String getObjectName(String category, String id) {
String jmxAgentName = System.getProperty("jmx.agent.name");
if (jmxAgentName == null || "".equals(jmxAgentName)) {
jmxAgentName = "org.apache.synapse";
}
return jmxAgentName + ":Type=" + category + ",Name=" + id;
}
private void assertNull(String name, String msg) {
if (name == null || "".equals(name)) {
handleException(msg);
}
}
private void assertNull(Object object, String msg) {
if (object == null) {
handleException(msg);
}
}
private static void handleException(String msg) {
log.error(msg);
throw new SynapseCommonsException(msg);
}
}