MBeanServerProxy


1   /*
2    * EJTools, the Enterprise Java Tools
3    *
4    * Distributable under LGPL license.
5    * See terms of license at www.gnu.org.
6    */
7   package org.ejtools.jmx;
8   
9   import java.lang.reflect.InvocationHandler  ;
10  import java.lang.reflect.Method  ;
11  import java.lang.reflect.Proxy  ;
12  
13  import javax.management.MBeanServer  ;
14  
15  /**
16   * A proxy for object that provides MBeanServer fonctionnality
17   *
18   * @author    Laurent Etiemble
19   * @version   $Revision: 1.8 $
20   */
21  public class MBeanServerProxy implements InvocationHandler  
22  {
23     /** The class to search the method on */
24     protected Class   clazz = null;
25     /** The real object */
26     protected Object   object = null;
27     /** Interface implemented by the proxy */
28     private final static Class  [] INTERFACES = new Class  []{MBeanServer  .class};
29  
30  
31     /**
32      * Constructor for MBeanServerProxy.
33      *
34      * @param object  Real object to proxy
35      * @param clazz   Class of the proxied object
36      */
37     public MBeanServerProxy(Object   object, Class   clazz)
38     {
39        this.object = object;
40        this.clazz = clazz;
41     }
42  
43  
44     /**
45      * Invocation method. Delegates the method call to the real object.
46      *
47      * @param method         Method called
48      * @param args           Method arguments
49      * @param obj            The method on which the invocation was made
50      * @return               The return value of the method
51      * @exception Throwable  In case of Exception
52      */
53     public Object   invoke(Object   obj, Method   method, Object  [] args)
54        throws Throwable  
55     {
56        Method   m = this.clazz.getMethod(method.getName(), method.getParameterTypes());
57        if (m != null)
58        {
59           ClassLoader   ctxLoader = Thread.currentThread().getContextClassLoader();
60  
61           try
62           {
63              Thread.currentThread().setContextClassLoader(this.clazz.getClassLoader());
64              return m.invoke(this.object, args);
65           }
66           finally
67           {
68              Thread.currentThread().setContextClassLoader(ctxLoader);
69           }
70        }
71        return null;
72     }
73  
74  
75     /**
76      * Factory method to create a proxy
77      *
78      * @param object  Real object to proxy
79      * @return        The proxy created
80      */
81     public static MBeanServer   createMBeanProxy(Object   object)
82     {
83        return MBeanServerProxy.createMBeanProxy(object, object.getClass());
84     }
85  
86  
87     /**
88      * Factory method to create a proxy
89      *
90      * @param object  Real object to proxy
91      * @param clazz   Class of the proxied object
92      * @return        The proxy created
93      */
94     public static MBeanServer   createMBeanProxy(Object   object, Class   clazz)
95     {
96        MBeanServerProxy proxy = new MBeanServerProxy(object, clazz);
97        return (MBeanServer  ) Proxy.newProxyInstance(MBeanServerProxy.class.getClassLoader(), MBeanServerProxy.INTERFACES, proxy);
98     }
99  }
100
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