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Java > Open Source Codes > org > exolab > jms > net > connector > ContextInvocationHandler


1 /**
2  * Redistribution and use of this software and associated documentation
3  * ("Software"), with or without modification, are permitted provided
4  * that the following conditions are met:
5  *
6  * 1. Redistributions of source code must retain copyright
7  * statements and notices. Redistributions must also contain a
8  * copy of this document.
9  *
10  * 2. Redistributions in binary form must reproduce the
11  * above copyright notice, this list of conditions and the
12  * following disclaimer in the documentation and/or other
13  * materials provided with the distribution.
14  *
15  * 3. The name "Exolab" must not be used to endorse or promote
16  * products derived from this Software without prior written
17  * permission of Exoffice Technologies. For written permission,
18  * please contact info@exolab.org.
19  *
20  * 4. Products derived from this Software may not be called "Exolab"
21  * nor may "Exolab" appear in their names without prior written
22  * permission of Exoffice Technologies. Exolab is a registered
23  * trademark of Exoffice Technologies.
24  *
25  * 5. Due credit should be given to the Exolab Project
26  * (http://www.exolab.org/).
27  *
28  * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
29  * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32  * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39  * OF THE POSSIBILITY OF SUCH DAMAGE.
40  *
41  * Copyright 2005 (C) Exoffice Technologies Inc. All Rights Reserved.
42  *
43  * $Id: ContextInvocationHandler.java,v 1.1 2005/06/04 15:02:41 tanderson Exp $
44  */
45 package org.exolab.jms.net.connector;
46
47 import org.exolab.jms.net.proxy.Proxy;
48
49
50 /**
51  * <code>InvocationHandler</code> implementation that sets the current {@link
52  * ConnectionContext}. before delegating invocations.<br/>
53  * This ensures {@link Proxy} instances are associated with the appropriate
54  * {@link Connection} and {@link ConnectionFactory} on deserialization.
55  *
56  * @author <a HREF="mailto:tma@netspace.net.au">Tim Anderson</a>
57  * @version $Revision: 1.1 $ $Date: 2005/06/04 15:02:41 $
58  * @see ConnectionContext
59  */
60 public class ContextInvocationHandler implements InvocationHandler {
61
62     /**
63      * The invocation handler to delegate to.
64      */
65     private final InvocationHandler _handler;
66
67     /**
68      * Cached connection instance.
69      */
70     private Connection _connection;
71
72     /**
73      * The connection factory for resolving connections via their URI.
74      */
75     private final ConnectionFactory _resolver;
76
77
78     /**
79      * Construct a new <code>ContextInvocationHandler</code>.
80      *
81      * @param handler the handler to delegate to
82      * @param resolver the connection factory for resolving connections via
83      * their URI
84      */
85     public ContextInvocationHandler(InvocationHandler handler,
86                                     ConnectionFactory resolver) {
87         _handler = handler;
88         _resolver = resolver;
89     }
90
91     /**
92      * Sets the connection.
93      *
94      * @param connection the connection
95      */
96     public void setConnection(Connection connection) {
97         _connection = connection;
98     }
99
100     /**
101      * Perform an invocation.
102      *
103      * @param invocation the invocation
104      */
105     public void invoke(Invocation invocation) {
106         try {
107             ConnectionContext.push(_resolver, _connection);
108             _handler.invoke(invocation);
109         } finally {
110             ConnectionContext.pop();
111         }
112     }
113 }
114
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