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Java > Open Source Codes > org > exolab > jms > net > orb > RegistryImpl


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 2003-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42  *
43  * $Id: RegistryImpl.java,v 1.1 2004/11/26 01:51:04 tanderson Exp $
44  */
45 package org.exolab.jms.net.orb;
46
47 import java.rmi.AccessException JavaDoc;
48 import java.rmi.AlreadyBoundException JavaDoc;
49 import java.rmi.NotBoundException JavaDoc;
50 import java.util.HashMap JavaDoc;
51
52 import org.exolab.jms.net.proxy.Proxy;
53 import org.exolab.jms.net.registry.Registry;
54
55
56 /**
57  * The <code>RegistryImpl</code> provides a simple interface for binding and
58  * retrieving remote object references by name.
59  *
60  * @author <a HREF="mailto:tma@netspace.net.au">Tim Anderson</a>
61  * @version $Revision: 1.1 $ $Date: 2004/11/26 01:51:04 $
62  */
63 class RegistryImpl implements Registry {
64
65     /**
66      * The registry service proxy class name
67      */
68     public static final String JavaDoc PROXY =
69             RegistryImpl.class.getName() + "__Proxy";
70
71     /**
72      * A map of bindings to proxies
73      */
74     private HashMap JavaDoc _registry = new HashMap JavaDoc();
75
76     /**
77      * Determines if the registry is read-only for remote users
78      */
79     private boolean _readOnly = false;
80
81
82     /**
83      * Construct a new <code>RegistryImpl</code>
84      */
85     public RegistryImpl() {
86     }
87
88     /**
89      * Returns a proxy for the remote object associated with the specified name
90      *
91      * @param name the name the proxy is bound under
92      * @return proxy the proxy for the remote object
93      * @throws NotBoundException if <code>name<code> is not bound
94      */
95     public synchronized Proxy lookup(String JavaDoc name) throws NotBoundException JavaDoc {
96         Proxy proxy = (Proxy) _registry.get(name);
97         if (proxy == null) {
98             throw new NotBoundException JavaDoc(name);
99         }
100         return proxy;
101     }
102
103     /**
104      * Binds the specified name to a remote object.
105      *
106      * @param name the name of the binding
107      * @param proxy the proxy for the remote object
108      * @throws AccessException if the caller doesn't have permission to
109      * bind the object
110      * @throws AlreadyBoundException if <code>name</code> is already bound
111      */
112     public synchronized void bind(String JavaDoc name, Proxy proxy)
113             throws AccessException JavaDoc, AlreadyBoundException JavaDoc {
114         checkReadOnly();
115         doBind(name, proxy);
116     }
117
118     /**
119      * Removes the binding for the specified name
120      *
121      * @param name the name of the binding
122      * @throws AccessException if the caller doesn't have permission to unbind
123      * the object
124      * @throws NotBoundException if <code>name<code> is not bound
125      */
126     public synchronized void unbind(String JavaDoc name)
127             throws AccessException JavaDoc, NotBoundException JavaDoc {
128         checkReadOnly();
129         doUnbind(name);
130     }
131
132     /**
133      * Binds the specified name to a remote object.
134      *
135      * @param name the name of the binding
136      * @param proxy the proxy for the remote object
137      * @throws AlreadyBoundException if <code>name</code> is already bound
138      */
139     protected synchronized void doBind(String JavaDoc name, Proxy proxy)
140             throws AlreadyBoundException JavaDoc {
141         if (_registry.containsKey(name)) {
142             throw new AlreadyBoundException JavaDoc(name);
143         }
144         _registry.put(name, proxy);
145     }
146
147     /**
148      * Removes the binding for the specified name
149      *
150      * @param name the name of the binding
151      * @throws NotBoundException if <code>name<code> is not bound
152      */
153     protected synchronized void doUnbind(String JavaDoc name)
154             throws NotBoundException JavaDoc {
155         Object JavaDoc proxy = _registry.remove(name);
156         if (proxy == null) {
157             throw new NotBoundException JavaDoc(name);
158         }
159     }
160
161     /**
162      * Set if the registry is read-only
163      *
164      * @param readOnly if <code>true</code>, prevent remote users from modifying
165      * bindings
166      */
167     protected synchronized void setReadOnly(boolean readOnly) {
168         _readOnly = readOnly;
169     }
170
171     /**
172      * Determines if the registry is read-only
173      *
174      * @return <code>true</code> if the registry is read-only
175      */
176     protected synchronized boolean getReadOnly() {
177         return _readOnly;
178     }
179
180     /**
181      * Checks if the registry is read-only
182      *
183      * @throws AccessException if the registry is read-only
184      */
185     private void checkReadOnly() throws AccessException JavaDoc {
186         if (_readOnly) {
187             throw new AccessException JavaDoc("Registry is read-only");
188         }
189     }
190
191 }
192
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