/*
* Copyright (c) 2005-2014, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.event.statistics.internal.jmx;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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.wso2.carbon.event";
}
//When this id parameter is an event stream ID, it contains the colon character which is an invalid one to be included in an MBean object name.
//Therefore, it will be replaced with an underscore.
return jmxAgentName + ":Type=" + category + ",Name=" + id.replace(':', '_');
}
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 SecurityException(msg);
}
}