1 /*
2 * Copyright 1996-2003 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.rmi.registry;
27
28 import java.rmi.RemoteException;
29 import java.rmi.server.ObjID;
30 import java.rmi.server.RMIClientSocketFactory;
31 import java.rmi.server.RMIServerSocketFactory;
32 import java.rmi.server.RemoteRef;
33 import java.rmi.server.UnicastRemoteObject;
34 import sun.rmi.registry.RegistryImpl;
35 import sun.rmi.server.UnicastRef2;
36 import sun.rmi.server.UnicastRef;
37 import sun.rmi.server.Util;
38 import sun.rmi.transport.LiveRef;
39 import sun.rmi.transport.tcp.TCPEndpoint;
40
41 /**
42 * <code>LocateRegistry</code> is used to obtain a reference to a bootstrap
43 * remote object registry on a particular host (including the local host), or
44 * to create a remote object registry that accepts calls on a specific port.
45 *
46 * <p> Note that a <code>getRegistry</code> call does not actually make a
47 * connection to the remote host. It simply creates a local reference to
48 * the remote registry and will succeed even if no registry is running on
49 * the remote host. Therefore, a subsequent method invocation to a remote
50 * registry returned as a result of this method may fail.
51 *
52 * @author Ann Wollrath
53 * @author Peter Jones
54 * @since JDK1.1
55 * @see java.rmi.registry.Registry
56 */
57 public final class LocateRegistry {
58
59 /**
60 * Private constructor to disable public construction.
61 */
62 private LocateRegistry() {}
63
64 /**
65 * Returns a reference to the the remote object <code>Registry</code> for
66 * the local host on the default registry port of 1099.
67 *
68 * @return reference (a stub) to the remote object registry
69 * @exception RemoteException if the reference could not be created
70 * @since JDK1.1
71 */
72 public static Registry getRegistry()
73 throws RemoteException
74 {
75 return getRegistry(null, Registry.REGISTRY_PORT);
76 }
77
78 /**
79 * Returns a reference to the the remote object <code>Registry</code> for
80 * the local host on the specified <code>port</code>.
81 *
82 * @param port port on which the registry accepts requests
83 * @return reference (a stub) to the remote object registry
84 * @exception RemoteException if the reference could not be created
85 * @since JDK1.1
86 */
87 public static Registry getRegistry(int port)
88 throws RemoteException
89 {
90 return getRegistry(null, port);
91 }
92
93 /**
94 * Returns a reference to the remote object <code>Registry</code> on the
95 * specified <code>host</code> on the default registry port of 1099. If
96 * <code>host</code> is <code>null</code>, the local host is used.
97 *
98 * @param host host for the remote registry
99 * @return reference (a stub) to the remote object registry
100 * @exception RemoteException if the reference could not be created
101 * @since JDK1.1
102 */
103 public static Registry getRegistry(String host)
104 throws RemoteException
105 {
106 return getRegistry(host, Registry.REGISTRY_PORT);
107 }
108
109 /**
110 * Returns a reference to the remote object <code>Registry</code> on the
111 * specified <code>host</code> and <code>port</code>. If <code>host</code>
112 * is <code>null</code>, the local host is used.
113 *
114 * @param host host for the remote registry
115 * @param port port on which the registry accepts requests
116 * @return reference (a stub) to the remote object registry
117 * @exception RemoteException if the reference could not be created
118 * @since JDK1.1
119 */
120 public static Registry getRegistry(String host, int port)
121 throws RemoteException
122 {
123 return getRegistry(host, port, null);
124 }
125
126 /**
127 * Returns a locally created remote reference to the remote object
128 * <code>Registry</code> on the specified <code>host</code> and
129 * <code>port</code>. Communication with this remote registry will
130 * use the supplied <code>RMIClientSocketFactory</code> <code>csf</code>
131 * to create <code>Socket</code> connections to the registry on the
132 * remote <code>host</code> and <code>port</code>.
133 *
134 * @param host host for the remote registry
135 * @param port port on which the registry accepts requests
136 * @param csf client-side <code>Socket</code> factory used to
137 * make connections to the registry. If <code>csf</code>
138 * is null, then the default client-side <code>Socket</code>
139 * factory will be used in the registry stub.
140 * @return reference (a stub) to the remote registry
141 * @exception RemoteException if the reference could not be created
142 * @since 1.2
143 */
144 public static Registry getRegistry(String host, int port,
145 RMIClientSocketFactory csf)
146 throws RemoteException
147 {
148 Registry registry = null;
149
150 if (port <= 0)
151 port = Registry.REGISTRY_PORT;
152
153 if (host == null || host.length() == 0) {
154 // If host is blank (as returned by "file:" URL in 1.0.2 used in
155 // java.rmi.Naming), try to convert to real local host name so
156 // that the RegistryImpl's checkAccess will not fail.
157 try {
158 host = java.net.InetAddress.getLocalHost().getHostAddress();
159 } catch (Exception e) {
160 // If that failed, at least try "" (localhost) anyway...
161 host = "";
162 }
163 }
164
165 /*
166 * Create a proxy for the registry with the given host, port, and
167 * client socket factory. If the supplied client socket factory is
168 * null, then the ref type is a UnicastRef, otherwise the ref type
169 * is a UnicastRef2. If the property
170 * java.rmi.server.ignoreStubClasses is true, then the proxy
171 * returned is an instance of a dynamic proxy class that implements
172 * the Registry interface; otherwise the proxy returned is an
173 * instance of the pregenerated stub class for RegistryImpl.
174 **/
175 LiveRef liveRef =
176 new LiveRef(new ObjID(ObjID.REGISTRY_ID),
177 new TCPEndpoint(host, port, csf, null),
178 false);
179 RemoteRef ref =
180 (csf == null) ? new UnicastRef(liveRef) : new UnicastRef2(liveRef);
181
182 return (Registry) Util.createProxy(RegistryImpl.class, ref, false);
183 }
184
185 /**
186 * Creates and exports a <code>Registry</code> instance on the local
187 * host that accepts requests on the specified <code>port</code>.
188 *
189 * <p>The <code>Registry</code> instance is exported as if the static
190 * {@link UnicastRemoteObject.exportObject(Remote,int)
191 * UnicastRemoteObject.exportObject} method is invoked, passing the
192 * <code>Registry</code> instance and the specified <code>port</code> as
193 * arguments, except that the <code>Registry</code> instance is
194 * exported with a well-known object identifier, an {@link ObjID}
195 * instance constructed with the value {@link ObjID#REGISTRY_ID}.
196 *
197 * @param port the port on which the registry accepts requests
198 * @return the registry
199 * @exception RemoteException if the registry could not be exported
200 * @since JDK1.1
201 **/
202 public static Registry createRegistry(int port) throws RemoteException {
203 return new RegistryImpl(port);
204 }
205
206 /**
207 * Creates and exports a <code>Registry</code> instance on the local
208 * host that uses custom socket factories for communication with that
209 * instance. The registry that is created listens for incoming
210 * requests on the given <code>port</code> using a
211 * <code>ServerSocket</code> created from the supplied
212 * <code>RMIServerSocketFactory</code>.
213 *
214 * <p>The <code>Registry</code> instance is exported as if
215 * the static {@link
216 * UnicastRemoteObject.exportObject(Remote,int,RMIClientSocketFactory,RMIServerSocketFactory)
217 * UnicastRemoteObject.exportObject} method is invoked, passing the
218 * <code>Registry</code> instance, the specified <code>port</code>, the
219 * specified <code>RMIClientSocketFactory</code>, and the specified
220 * <code>RMIServerSocketFactory</code> as arguments, except that the
221 * <code>Registry</code> instance is exported with a well-known object
222 * identifier, an {@link ObjID} instance constructed with the value
223 * {@link ObjID#REGISTRY_ID}.
224 *
225 * @param port port on which the registry accepts requests
226 * @param csf client-side <code>Socket</code> factory used to
227 * make connections to the registry
228 * @param ssf server-side <code>ServerSocket</code> factory
229 * used to accept connections to the registry
230 * @return the registry
231 * @exception RemoteException if the registry could not be exported
232 * @since 1.2
233 **/
234 public static Registry createRegistry(int port,
235 RMIClientSocketFactory csf,
236 RMIServerSocketFactory ssf)
237 throws RemoteException
238 {
239 return new RegistryImpl(port, csf, ssf);
240 }
241 }
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