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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.commons.jcs3.jcache.jmx;
20  
21  import javax.management.MBeanServer;
22  import javax.management.MBeanServerFactory;
23  import javax.management.ObjectName;
24  import java.lang.management.ManagementFactory;
25  
26  public class JMXs
27  {
28      private static final MBeanServer SERVER = findMBeanServer();
29  
30      public static MBeanServer server()
31      {
32          return SERVER;
33      }
34  
35      public static void register(final ObjectName on, final Object bean)
36      {
37          if (!SERVER.isRegistered(on))
38          {
39              try
40              {
41                  SERVER.registerMBean(bean, on);
42              }
43              catch (final Exception e)
44              {
45                  throw new IllegalStateException(e.getMessage(), e);
46              }
47          }
48      }
49  
50      public static void unregister(final ObjectName on)
51      {
52          if (SERVER.isRegistered(on))
53          {
54              try
55              {
56                  SERVER.unregisterMBean(on);
57              }
58              catch (final Exception e)
59              {
60                  // no-op
61              }
62          }
63      }
64  
65      private static MBeanServer findMBeanServer()
66      {
67          if (System.getProperty("javax.management.builder.initial") != null)
68          {
69              return MBeanServerFactory.createMBeanServer();
70          }
71          return ManagementFactory.getPlatformMBeanServer();
72      }
73  
74      private JMXs()
75      {
76          // no-op
77      }
78  }