1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/javax/rmi/PortableRemoteObject.java Wed Apr 27 01:21:28 2016 +0800
1.3 @@ -0,0 +1,293 @@
1.4 +/*
1.5 + * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +/*
1.29 + * Licensed Materials - Property of IBM
1.30 + * RMI-IIOP v1.0
1.31 + * Copyright IBM Corp. 1998 1999 All Rights Reserved
1.32 + *
1.33 + */
1.34 +
1.35 +package javax.rmi;
1.36 +
1.37 +import java.lang.reflect.Method ;
1.38 +
1.39 +import org.omg.CORBA.INITIALIZE;
1.40 +import javax.rmi.CORBA.Util;
1.41 +
1.42 +import java.rmi.RemoteException;
1.43 +import java.rmi.NoSuchObjectException;
1.44 +import java.rmi.Remote;
1.45 +import java.io.File;
1.46 +import java.io.FileInputStream;
1.47 +import java.util.Properties;
1.48 +import java.net.MalformedURLException ;
1.49 +import java.security.AccessController;
1.50 +import java.security.PrivilegedAction;
1.51 +import java.rmi.server.RMIClassLoader;
1.52 +
1.53 +import com.sun.corba.se.impl.orbutil.GetPropertyAction;
1.54 +
1.55 +/**
1.56 + * Server implementation objects may either inherit from
1.57 + * javax.rmi.PortableRemoteObject or they may implement a remote interface
1.58 + * and then use the exportObject method to register themselves as a server object.
1.59 + * The toStub method takes a server implementation and returns a stub that
1.60 + * can be used to access that server object.
1.61 + * The connect method makes a Remote object ready for remote communication.
1.62 + * The unexportObject method is used to deregister a server object, allowing it to become
1.63 + * available for garbage collection.
1.64 + * The narrow method takes an object reference or abstract interface type and
1.65 + * attempts to narrow it to conform to
1.66 + * the given interface. If the operation is successful the result will be an
1.67 + * object of the specified type, otherwise an exception will be thrown.
1.68 + */
1.69 +public class PortableRemoteObject {
1.70 +
1.71 + private static final javax.rmi.CORBA.PortableRemoteObjectDelegate proDelegate;
1.72 +
1.73 + private static final String PortableRemoteObjectClassKey =
1.74 + "javax.rmi.CORBA.PortableRemoteObjectClass";
1.75 +
1.76 + static {
1.77 + proDelegate = (javax.rmi.CORBA.PortableRemoteObjectDelegate)
1.78 + createDelegate(PortableRemoteObjectClassKey);
1.79 + }
1.80 +
1.81 + /**
1.82 + * Initializes the object by calling <code>exportObject(this)</code>.
1.83 + * @exception RemoteException if export fails.
1.84 + */
1.85 + protected PortableRemoteObject() throws RemoteException {
1.86 + if (proDelegate != null) {
1.87 + PortableRemoteObject.exportObject((Remote)this);
1.88 + }
1.89 + }
1.90 +
1.91 + /**
1.92 + * Makes a server object ready to receive remote calls. Note
1.93 + * that subclasses of PortableRemoteObject do not need to call this
1.94 + * method, as it is called by the constructor.
1.95 + * @param obj the server object to export.
1.96 + * @exception RemoteException if export fails.
1.97 + */
1.98 + public static void exportObject(Remote obj)
1.99 + throws RemoteException {
1.100 +
1.101 + // Let the delegate do everything, including error handling.
1.102 + if (proDelegate != null) {
1.103 + proDelegate.exportObject(obj);
1.104 + }
1.105 + }
1.106 +
1.107 + /**
1.108 + * Returns a stub for the given server object.
1.109 + * @param obj the server object for which a stub is required. Must either be a subclass
1.110 + * of PortableRemoteObject or have been previously the target of a call to
1.111 + * {@link #exportObject}.
1.112 + * @return the most derived stub for the object.
1.113 + * @exception NoSuchObjectException if a stub cannot be located for the given server object.
1.114 + */
1.115 + public static Remote toStub (Remote obj)
1.116 + throws NoSuchObjectException {
1.117 +
1.118 + if (proDelegate != null) {
1.119 + return proDelegate.toStub(obj);
1.120 + }
1.121 + return null;
1.122 + }
1.123 +
1.124 + /**
1.125 + * Deregisters a server object from the runtime, allowing the object to become
1.126 + * available for garbage collection.
1.127 + * @param obj the object to unexport.
1.128 + * @exception NoSuchObjectException if the remote object is not
1.129 + * currently exported.
1.130 + */
1.131 + public static void unexportObject(Remote obj)
1.132 + throws NoSuchObjectException {
1.133 +
1.134 + if (proDelegate != null) {
1.135 + proDelegate.unexportObject(obj);
1.136 + }
1.137 +
1.138 + }
1.139 +
1.140 + /**
1.141 + * Checks to ensure that an object of a remote or abstract interface type
1.142 + * can be cast to a desired type.
1.143 + * @param narrowFrom the object to check.
1.144 + * @param narrowTo the desired type.
1.145 + * @return an object which can be cast to the desired type.
1.146 + * @throws ClassCastException if narrowFrom cannot be cast to narrowTo.
1.147 + */
1.148 + public static java.lang.Object narrow ( java.lang.Object narrowFrom,
1.149 + java.lang.Class narrowTo)
1.150 + throws ClassCastException {
1.151 +
1.152 + if (proDelegate != null) {
1.153 + return proDelegate.narrow(narrowFrom, narrowTo);
1.154 + }
1.155 + return null;
1.156 +
1.157 + }
1.158 +
1.159 + /**
1.160 + * Makes a Remote object ready for remote communication. This normally
1.161 + * happens implicitly when the object is sent or received as an argument
1.162 + * on a remote method call, but in some circumstances it is useful to
1.163 + * perform this action by making an explicit call. See the
1.164 + * {@link javax.rmi.CORBA.Stub#connect} method for more information.
1.165 + * @param target the object to connect.
1.166 + * @param source a previously connected object.
1.167 + * @throws RemoteException if <code>source</code> is not connected
1.168 + * or if <code>target</code> is already connected to a different ORB than
1.169 + * <code>source</code>.
1.170 + */
1.171 + public static void connect (Remote target, Remote source)
1.172 + throws RemoteException {
1.173 +
1.174 + if (proDelegate != null) {
1.175 + proDelegate.connect(target, source);
1.176 + }
1.177 +
1.178 + }
1.179 +
1.180 + // Same code as in javax.rmi.CORBA.Util. Can not be shared because they
1.181 + // are in different packages and the visibility needs to be package for
1.182 + // security reasons. If you know a better solution how to share this code
1.183 + // then remove it from here.
1.184 + private static Object createDelegate(String classKey) {
1.185 + String className = (String)
1.186 + AccessController.doPrivileged(new GetPropertyAction(classKey));
1.187 + if (className == null) {
1.188 + Properties props = getORBPropertiesFile();
1.189 + if (props != null) {
1.190 + className = props.getProperty(classKey);
1.191 + }
1.192 + }
1.193 + if (className == null) {
1.194 + return new com.sun.corba.se.impl.javax.rmi.PortableRemoteObject();
1.195 + }
1.196 +
1.197 + try {
1.198 + return (Object) loadDelegateClass(className).newInstance();
1.199 + } catch (ClassNotFoundException ex) {
1.200 + INITIALIZE exc = new INITIALIZE( "Cannot instantiate " + className);
1.201 + exc.initCause( ex ) ;
1.202 + throw exc ;
1.203 + } catch (Exception ex) {
1.204 + INITIALIZE exc = new INITIALIZE( "Error while instantiating" + className);
1.205 + exc.initCause( ex ) ;
1.206 + throw exc ;
1.207 + }
1.208 +
1.209 + }
1.210 +
1.211 + private static Class loadDelegateClass( String className ) throws ClassNotFoundException
1.212 + {
1.213 + try {
1.214 + ClassLoader loader = Thread.currentThread().getContextClassLoader();
1.215 + return Class.forName(className, false, loader);
1.216 + } catch (ClassNotFoundException e) {
1.217 + // ignore, then try RMIClassLoader
1.218 + }
1.219 +
1.220 + try {
1.221 + return RMIClassLoader.loadClass(className);
1.222 + } catch (MalformedURLException e) {
1.223 + String msg = "Could not load " + className + ": " + e.toString();
1.224 + ClassNotFoundException exc = new ClassNotFoundException( msg ) ;
1.225 + throw exc ;
1.226 + }
1.227 + }
1.228 +
1.229 + /**
1.230 + * Load the orb.properties file.
1.231 + */
1.232 + private static Properties getORBPropertiesFile () {
1.233 + return (Properties) AccessController.doPrivileged(new GetORBPropertiesFileAction());
1.234 + }
1.235 +}
1.236 +
1.237 +class GetORBPropertiesFileAction implements PrivilegedAction {
1.238 + private boolean debug = false ;
1.239 +
1.240 + public GetORBPropertiesFileAction () {
1.241 + }
1.242 +
1.243 + private String getSystemProperty(final String name) {
1.244 + // This will not throw a SecurityException because this
1.245 + // class was loaded from rt.jar using the bootstrap classloader.
1.246 + String propValue = (String) AccessController.doPrivileged(
1.247 + new PrivilegedAction() {
1.248 + public java.lang.Object run() {
1.249 + return System.getProperty(name);
1.250 + }
1.251 + }
1.252 + );
1.253 +
1.254 + return propValue;
1.255 + }
1.256 +
1.257 + private void getPropertiesFromFile( Properties props, String fileName )
1.258 + {
1.259 + try {
1.260 + File file = new File( fileName ) ;
1.261 + if (!file.exists())
1.262 + return ;
1.263 +
1.264 + FileInputStream in = new FileInputStream( file ) ;
1.265 +
1.266 + try {
1.267 + props.load( in ) ;
1.268 + } finally {
1.269 + in.close() ;
1.270 + }
1.271 + } catch (Exception exc) {
1.272 + if (debug)
1.273 + System.out.println( "ORB properties file " + fileName +
1.274 + " not found: " + exc) ;
1.275 + }
1.276 + }
1.277 +
1.278 + public Object run()
1.279 + {
1.280 + Properties defaults = new Properties() ;
1.281 +
1.282 + String javaHome = getSystemProperty( "java.home" ) ;
1.283 + String fileName = javaHome + File.separator + "lib" + File.separator +
1.284 + "orb.properties" ;
1.285 +
1.286 + getPropertiesFromFile( defaults, fileName ) ;
1.287 +
1.288 + Properties results = new Properties( defaults ) ;
1.289 +
1.290 + String userHome = getSystemProperty( "user.home" ) ;
1.291 + fileName = userHome + File.separator + "orb.properties" ;
1.292 +
1.293 + getPropertiesFromFile( results, fileName ) ;
1.294 + return results ;
1.295 + }
1.296 +}
