1 /* 2 * Copyright (c) 1996, 2003, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * 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 }