AppServerMBeanServerFactory


1   /*
2    * The contents of this file are subject to the terms 
3    * of the Common Development and Distribution License 
4    * (the License).  You may not use this file except in
5    * compliance with the License.
6    * 
7    * You can obtain a copy of the license at 
8    * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9    * glassfish/bootstrap/legal/CDDLv1.0.txt.
10   * See the License for the specific language governing 
11   * permissions and limitations under the License.
12   * 
13   * When distributing Covered Code, include this CDDL 
14   * Header Notice in each file and include the License file 
15   * at glassfish/bootstrap/legal/CDDLv1.0.txt.  
16   * If applicable, add the following below the CDDL Header, 
17   * with the fields enclosed by brackets [] replaced by
18   * you own identifying information: 
19   * "Portions Copyrighted [year] [name of copyright owner]"
20   * 
21   * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22   */
23  
24  package com.sun.enterprise.admin.server.core.jmx;
25  
26  import javax.management.MBeanServer  ;
27  import java.lang.management.ManagementFactory  ;
28  
29  /**
30   * AppServer's MBS factory to create a singleton MBS
31   * (with interceptors) necessary for the appserver.
32   *
33   * @author  sridatta
34   */
35  public class AppServerMBeanServerFactory {
36      
37      private static MBeanServer   _mbs  = null;
38      
39      /**
40       * Factory method to generate the only instance of this class in the JVM.
41       * Makes sure that the constructor of this class is called exactly once.
42       *
43       * @return MBeanServer instance by calling private constructor.
44       * @throws InitException if the MBeanServer can not be initialized.
45       */
46      public synchronized static MBeanServer   getMBeanServerInstance()
47      throws InitException {
48          if (_mbs == null) {
49              _mbs = getAppServerMBeanServer();
50              //Also bind in JNDI // TBD FIXME
51              // so that it can be used in a generic way
52          }
53          return ( _mbs );
54      }
55      
56      /**
57       * This method gets app server's MBS. First, it
58       * enables AppServer MBS on the builder, then creates
59       * the MBS using the standard mechanism and then
60       * resets the flag. It is synchronized on the builder
61       * since we do not want anyone creating an MBS
62       * during this period.
63       */
64      private static MBeanServer   getAppServerMBeanServer() {
65          MBeanServer   ms = null;
66          synchronized (AppServerMBeanServerBuilder.class) {
67              AppServerMBeanServerBuilder.enableAppServerMBeanServer(true);
68              try {
69                  ms = ManagementFactory.getPlatformMBeanServer();
70              } finally {
71                  AppServerMBeanServerBuilder.enableAppServerMBeanServer(false);
72              }
73          }
74          return ms;
75      }
76  }
77
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