| /* |
| * 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.servicemix.common.management; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.jbi.JBIException; |
| import javax.management.*; |
| |
| /** |
| * Helper methods to register and unregister objects with a JMX MBeanServer |
| */ |
| public class MBeanServerHelper { |
| |
| private static final Logger LOGGER = LoggerFactory.getLogger(MBeanServerHelper.class); |
| |
| /** |
| * Registers an object with the MBean server using the specified object name. If another object is already registered, |
| * this method will first unregister it. The method also returns the final object name after registration, because |
| * some MBean servers will alter the name during the registration process |
| * |
| * @param server the MBean server |
| * @param name the object name |
| * @param object the object to be registered |
| * @return the final object name after registration |
| * @throws JBIException if the MBean server is null or if a problem occurs during MBean registration |
| */ |
| public static ObjectName register(MBeanServer server, ObjectName name, Object object) throws JBIException { |
| if (server == null) { |
| throw new JBIException("MBeanServer is null when registering MBean " + name); |
| } |
| |
| try { |
| // unregister a previously existing MBean first |
| doUnregister(server, name); |
| |
| LOGGER.debug("Registering MBean {}", name); |
| ObjectInstance instance = doRegister(server, name, object); |
| |
| ObjectName result = instance.getObjectName(); |
| LOGGER.debug("Successfully registered MBean {}", result); |
| |
| return result; |
| } catch (JMException e) { |
| throw new JBIException("Exception occured while registering JMX MBean " + name, e); |
| } |
| } |
| |
| private static ObjectInstance doRegister(MBeanServer server, ObjectName name, Object object) throws JMException, JBIException { |
| try { |
| return server.registerMBean(object, name); |
| } catch (InstanceAlreadyExistsException e) { |
| ObjectName existing = new ObjectName(e.getMessage()); |
| |
| if (existing.equals(name)) { |
| throw e; |
| } else { |
| // if the server has another instance registered under a different name, |
| // let's try unregistering that alternative name and retry registration afterwards |
| LOGGER.debug("Existing MBean {} matches {} - unregistering it before continuing", existing, name); |
| doUnregister(server, existing); |
| |
| return doRegister(server, name, object); |
| } |
| } |
| } |
| |
| /** |
| * Unregister the object with the specified name from the MBean server |
| * |
| * @param server the mbean server |
| * @param name the object name |
| * |
| * @throws JBIException if the MBean server is null or if there is a problem unregistering the MBean |
| */ |
| public static void unregister(MBeanServer server, ObjectName name) throws JBIException { |
| if (name != null) { |
| if (server == null) { |
| throw new JBIException("MBeanServer is null when registering MBean " + name); |
| } |
| |
| try { |
| doUnregister(server, name); |
| } catch (JMException e) { |
| throw new JBIException("Unable to unregister object with name " + name, e); |
| } |
| } |
| } |
| |
| private static void doUnregister(MBeanServer server, ObjectName name) throws JMException { |
| if (server.isRegistered(name)) { |
| LOGGER.debug("Unregistering MBean {}", name); |
| server.unregisterMBean(name); |
| } |
| } |
| } |