1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.mx.interceptor;
23
24 import org.jboss.mx.server.Invocation;
25 import org.jboss.mx.server.MBeanInvoker;
26
27 /**
28 * Interceptor that provides access to the org.jboss.mx.server.Interceptable hooks
29 * for dynamically adding and removing interceptors to an MBean.
30 *
31 * @author <a href="mailto:dimitris@jboss.org">Dimitris Andreadis</a>.
32 * @version $Revision: 39975 $
33 */
34 public class DynamicInterceptor extends AbstractInterceptor
35 {
36 /** methods implemented from org.jboss.mx.server.Interceptable */
37 public static final String ADD_INTERCEPTOR = "addOperationInterceptor";
38 public static final String REMOVE_INTERCEPTOR = "removeOperationInterceptor";
39
40 /** the invoker implementing Interceptable */
41 MBeanInvoker invoker;
42
43 /**
44 * CTOR
45 */
46 public DynamicInterceptor(MBeanInvoker invoker)
47 {
48 // initialize logger and name
49 super();
50 setName("DynamicInterceptor");
51
52 this.invoker = invoker;
53 }
54
55 /**
56 * Do the trick
57 */
58 public Object invoke(Invocation invocation)
59 throws Throwable
60 {
61 String type = invocation.getType();
62
63 // implement Interceptable by delegating to MBeanInvoker
64 if (type.equals(Invocation.OP_INVOKE))
65 {
66 String name = invocation.getName();
67
68 if (name.equals(ADD_INTERCEPTOR))
69 {
70 Object args[] = invocation.getArgs();
71 Object retn = invocation.getReturnTypeClass();
72
73 if ((args.length == 1) && (args[0] instanceof Interceptor) && (retn == null))
74 {
75 invoker.addOperationInterceptor((Interceptor)args[0]);
76 return null;
77 }
78 }
79 else if (name.equals(REMOVE_INTERCEPTOR))
80 {
81 Object args[] = invocation.getArgs();
82 Object retn = invocation.getReturnTypeClass();
83
84 if ((args.length == 1) && (args[0] instanceof Interceptor) && (retn == null))
85 {
86 invoker.removeOperationInterceptor((Interceptor)args[0]);
87 return null;
88 }
89 }
90 }
91
92 // call the next in the interceptor chain,
93 // if nobody follows dispatch the call
94 Interceptor next = invocation.nextInterceptor();
95 if (next != null)
96 {
97 return next.invoke(invocation);
98 }
99 else
100 {
101 return invocation.dispatch();
102 }
103 }
104 }
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