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;
48 import java.rmi.AlreadyBoundException;
49 import java.rmi.NotBoundException;
50 import java.util.HashMap;
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 PROXY =
69 RegistryImpl.class.getName() + "__Proxy";
70
71 /***
72 * A map of bindings to proxies
73 */
74 private HashMap _registry = new HashMap();
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 name) throws NotBoundException {
96 Proxy proxy = (Proxy) _registry.get(name);
97 if (proxy == null) {
98 throw new NotBoundException(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 name, Proxy proxy)
113 throws AccessException, AlreadyBoundException {
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 name)
127 throws AccessException, NotBoundException {
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 name, Proxy proxy)
140 throws AlreadyBoundException {
141 if (_registry.containsKey(name)) {
142 throw new AlreadyBoundException(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 name)
154 throws NotBoundException {
155 Object proxy = _registry.remove(name);
156 if (proxy == null) {
157 throw new NotBoundException(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 {
186 if (_readOnly) {
187 throw new AccessException("Registry is read-only");
188 }
189 }
190
191 }