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Java > Open Source Codes > org > exolab > jms > net > rmi > RegistryHelper


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 2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42  *
43  * $Id: RegistryHelper.java,v 1.1 2004/11/26 01:51:06 tanderson Exp $
44  */
45 package org.exolab.jms.net.rmi;
46
47 import java.rmi.AlreadyBoundException JavaDoc;
48 import java.rmi.NotBoundException JavaDoc;
49 import java.rmi.RemoteException JavaDoc;
50 import java.rmi.registry.Registry JavaDoc;
51
52 import org.exolab.jms.net.connector.ResourceException;
53 import org.exolab.jms.net.uri.URI;
54
55
56 /**
57  * Helper class for RMI registry operations
58  *
59  * @author <a HREF="mailto:tma@netspace.net.au">Tim Anderson</a>
60  * @version $Revision: 1.1 $ $Date: 2004/11/26 01:51:06 $
61  */
62 final class RegistryHelper {
63
64     /**
65      * Bind suffix for invoker factories
66      */
67     private static final String JavaDoc BIND_SUFFIX =
68             RMIInvokerFactory.class.getName();
69
70
71     /**
72      * Prevent construction of helper class
73      */
74     private RegistryHelper() {
75     }
76
77     /**
78      * Bind an invoker factory in the registry
79      *
80      * @param factory the invoker factory
81      * @param uri the URI of the managed connection, to uniquely identify
82      * the factory
83      * @param registry the registry to use
84      * @throws ResourceException if the bind fails
85      */
86     public static void bind(RMIInvokerFactory factory, URI uri,
87                             Registry JavaDoc registry) throws ResourceException {
88
89         String JavaDoc name = getName(uri);
90
91         try {
92             registry.bind(name, factory);
93         } catch (AlreadyBoundException JavaDoc exception) {
94             throw new ResourceException("Binding exists for " + name,
95                                         exception);
96         } catch (RemoteException JavaDoc exception) {
97             throw new ResourceException("Failed to bind connection factory",
98                                         exception);
99         }
100     }
101
102     /**
103      * Unbind an invoker factory from the registry
104      *
105      * @param factory the invoker factory
106      * @param uri the URI of the managed connection, to uniquely identify
107      * the factory
108      * @param registry the registry to use
109      * @throws ResourceException if the unbind fails
110      */
111     public static void unbind(RMIInvokerFactory factory, URI uri,
112                               Registry JavaDoc registry) throws ResourceException {
113         String JavaDoc name = getName(uri);
114         try {
115             registry.unbind(name);
116         } catch (NotBoundException JavaDoc exception) {
117             throw new ResourceException("No binding exists for " + name,
118                                         exception);
119         } catch (RemoteException JavaDoc exception) {
120             throw new ResourceException("Failed to unbind connection factory",
121                                         exception);
122         }
123     }
124
125     /**
126      * Returns the invoker factory bind name. This is the path portion of the
127      * connection URI suffixed with <code>"RMIInvokerFactory"</code>
128      *
129      * @param uri the connection URI
130      * @return the invoker factory bind name
131      */
132     public static String JavaDoc getName(URI uri) {
133         String JavaDoc path = uri.getPath();
134         if (path == null) {
135             path = "/";
136         } else if (!path.startsWith("/")) {
137             path = "/" + path;
138         }
139         if (!path.endsWith("/")) {
140             path += "/";
141         }
142
143         return path + BIND_SUFFIX;
144     }
145
146     /**
147      * Determines if there are any bindings in the registry
148      *
149      * @param registry the RMI registry to lookup
150      * @return <code>true</code> if one or more bindings exist
151      * @throws RemoteException if the operation fails
152      */
153     public static boolean hasBindings(Registry JavaDoc registry)
154             throws RemoteException JavaDoc {
155         String JavaDoc[] names = registry.list();
156         return (names.length != 0);
157     }
158
159 }
160
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