content: /*
   * 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.aries.jmx.mbean_server.platform.impl;
  
  import java.lang.management.ManagementFactory;
  import java.util.Hashtable;
  import javax.management.Attribute;
  import javax.management.AttributeList;
  import javax.management.MBeanServer;
  import javax.management.ObjectName;
  
  import org.osgi.framework.BundleActivator;
  import org.osgi.framework.BundleContext;
  import org.osgi.framework.ServiceRegistration;
  
  public class Activator implements BundleActivator {
  
      private final Object registrationLock = new Object();
      private ServiceRegistration<MBeanServer> registration;
  
      @Override
      public void start(BundleContext context) throws Exception {
          MBeanServer platformMBeanServer = ManagementFactory.getPlatformMBeanServer();
          Hashtable<String, Object> mbeanProps = new Hashtable<String, Object>();
          ObjectName beanName = ObjectName.getInstance("JMImplementation:type=MBeanServerDelegate");
          AttributeList attrs = platformMBeanServer.getAttributes(beanName, new String[] {
              "MBeanServerId",
              "SpecificationName",
              "SpecificationVersion",
              "SpecificationVendor",
              "ImplementationName",
              "ImplementationVersion",
              "ImplementationVendor"
          });
          for (Object object : attrs) {
              Attribute attr = (Attribute) object;
              if (attr.getValue() != null) {
                  mbeanProps.put(attr.getName(), attr.getValue().toString());
              }
          }
          synchronized (registrationLock) {
              registration = context.registerService(MBeanServer.class, platformMBeanServer, mbeanProps);
          }
      }
  
      @Override
      public void stop(BundleContext context) throws Exception {
          synchronized (registrationLock) {
              if (registration != null) {
                  registration.unregister();
                  registration = null;
              }
          }
      }
  }
  