Mercurial > jdk8-mips64-public > corba / file revision

 /*

  * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 /*

  * Licensed Materials - Property of IBM

  * RMI-IIOP v1.0

  * Copyright IBM Corp. 1998 1999  All Rights Reserved

  *

  */

 package javax.rmi;

 import java.lang.reflect.Method ;

 import org.omg.CORBA.INITIALIZE;

 import javax.rmi.CORBA.Util;

 import java.rmi.RemoteException;

 import java.rmi.NoSuchObjectException;

 import java.rmi.Remote;

 import java.io.File;

 import java.io.FileInputStream;

 import java.util.Properties;

 import java.net.MalformedURLException ;

 import java.security.AccessController;

 import java.security.PrivilegedAction;

 import java.rmi.server.RMIClassLoader;

 import com.sun.corba.se.impl.orbutil.GetPropertyAction;

 /**

  * Server implementation objects may either inherit from

  * javax.rmi.PortableRemoteObject or they may implement a remote interface

  * and then use the exportObject method to register themselves as a server object.

  * The toStub method takes a server implementation and returns a stub that

  * can be used to access that server object.

  * The connect method makes a Remote object ready for remote communication.

  * The unexportObject method is used to deregister a server object, allowing it to become

  * available for garbage collection.

  * The narrow method takes an object reference or abstract interface type and

  * attempts to narrow it to conform to

  * the given interface. If the operation is successful the result will be an

  * object of the specified type, otherwise an exception will be thrown.

  */

 public class PortableRemoteObject {

     private static javax.rmi.CORBA.PortableRemoteObjectDelegate proDelegate = null;

     private static final String PortableRemoteObjectClassKey =

             "javax.rmi.CORBA.PortableRemoteObjectClass";

     private static final String defaultPortableRemoteObjectImplName =

             "com.sun.corba.se.impl.javax.rmi.PortableRemoteObject";

     static {

         proDelegate = (javax.rmi.CORBA.PortableRemoteObjectDelegate)

             createDelegateIfSpecified(PortableRemoteObjectClassKey);

     }

     /**

      * Initializes the object by calling <code>exportObject(this)</code>.

      * @exception RemoteException if export fails.

      */

     protected PortableRemoteObject() throws RemoteException {

         if (proDelegate != null) {

             PortableRemoteObject.exportObject((Remote)this);

         }

     }

     /**

      * Makes a server object ready to receive remote calls. Note

      * that subclasses of PortableRemoteObject do not need to call this

      * method, as it is called by the constructor.

      * @param obj the server object to export.

      * @exception RemoteException if export fails.

      */

     public static void exportObject(Remote obj)

         throws RemoteException {

         // Let the delegate do everything, including error handling.

         if (proDelegate != null) {

             proDelegate.exportObject(obj);

         }

     }

     /**

      * Returns a stub for the given server object.

      * @param obj the server object for which a stub is required. Must either be a subclass

      * of PortableRemoteObject or have been previously the target of a call to

      * {@link #exportObject}.

      * @return the most derived stub for the object.

      * @exception NoSuchObjectException if a stub cannot be located for the given server object.

      */

     public static Remote toStub (Remote obj)

         throws NoSuchObjectException {

         if (proDelegate != null) {

             return proDelegate.toStub(obj);

         }

         return null;

     }

     /**

      * Deregisters a server object from the runtime, allowing the object to become

      * available for garbage collection.

      * @param obj the object to unexport.

      * @exception NoSuchObjectException if the remote object is not

      * currently exported.

      */

     public static void unexportObject(Remote obj)

         throws NoSuchObjectException {

         if (proDelegate != null) {

             proDelegate.unexportObject(obj);

         }

     }

     /**

      * Checks to ensure that an object of a remote or abstract interface type

      * can be cast to a desired type.

      * @param narrowFrom the object to check.

      * @param narrowTo the desired type.

      * @return an object which can be cast to the desired type.

      * @throws ClassCastException if narrowFrom cannot be cast to narrowTo.

      */

     public static java.lang.Object narrow ( java.lang.Object narrowFrom,

                                             java.lang.Class narrowTo)

         throws ClassCastException {

         if (proDelegate != null) {

             return proDelegate.narrow(narrowFrom, narrowTo);

         }

         return null;

     }

     /**

      * Makes a Remote object ready for remote communication. This normally

      * happens implicitly when the object is sent or received as an argument

      * on a remote method call, but in some circumstances it is useful to

      * perform this action by making an explicit call.  See the

      * {@link javax.rmi.CORBA.Stub#connect} method for more information.

      * @param target the object to connect.

      * @param source a previously connected object.

      * @throws RemoteException if <code>source</code> is not connected

      * or if <code>target</code> is already connected to a different ORB than

      * <code>source</code>.

      */

     public static void connect (Remote target, Remote source)

         throws RemoteException {

         if (proDelegate != null) {

             proDelegate.connect(target, source);

         }

     }

     // Same code as in javax.rmi.CORBA.Util. Can not be shared because they

     // are in different packages and the visibility needs to be package for

     // security reasons. If you know a better solution how to share this code

     // then remove it from here.

     private static Object createDelegateIfSpecified(String classKey) {

         String className = (String)

             AccessController.doPrivileged(new GetPropertyAction(classKey));

         if (className == null) {

             Properties props = getORBPropertiesFile();

             if (props != null) {

                 className = props.getProperty(classKey);

             }

         }

         if (className == null) {

                 className = defaultPortableRemoteObjectImplName;

         }

         try {

             return (Object) loadDelegateClass(className).newInstance();

         } catch (ClassNotFoundException ex) {

             INITIALIZE exc = new INITIALIZE( "Cannot instantiate " + className);

             exc.initCause( ex ) ;

             throw exc ;

         } catch (Exception ex) {

             INITIALIZE exc = new INITIALIZE( "Error while instantiating" + className);

             exc.initCause( ex ) ;

             throw exc ;

         }

     }

     private static Class loadDelegateClass( String className )  throws ClassNotFoundException

     {

         try {

             ClassLoader loader = Thread.currentThread().getContextClassLoader();

             return Class.forName(className, false, loader);

         } catch (ClassNotFoundException e) {

             // ignore, then try RMIClassLoader

         }

         try {

             return RMIClassLoader.loadClass(className);

         } catch (MalformedURLException e) {

             String msg = "Could not load " + className + ": " + e.toString();

             ClassNotFoundException exc = new ClassNotFoundException( msg ) ;

             throw exc ;

         }

     }

     /**

      * Load the orb.properties file.

      */

     private static Properties getORBPropertiesFile () {

         return (Properties) AccessController.doPrivileged(new GetORBPropertiesFileAction());

     }

 }

 class GetORBPropertiesFileAction implements PrivilegedAction {

     private boolean debug = false ;

     public GetORBPropertiesFileAction () {

     }

     private String getSystemProperty(final String name) {

         // This will not throw a SecurityException because this

         // class was loaded from rt.jar using the bootstrap classloader.

         String propValue = (String) AccessController.doPrivileged(

             new PrivilegedAction() {

                 public java.lang.Object run() {

                     return System.getProperty(name);

                 }

             }

         );

         return propValue;

     }

     private void getPropertiesFromFile( Properties props, String fileName )

     {

         try {

             File file = new File( fileName ) ;

             if (!file.exists())

                 return ;

             FileInputStream in = new FileInputStream( file ) ;

             try {

                 props.load( in ) ;

             } finally {

                 in.close() ;

             }

         } catch (Exception exc) {

             if (debug)

                 System.out.println( "ORB properties file " + fileName +

                     " not found: " + exc) ;

         }

     }

     public Object run()

     {

         Properties defaults = new Properties() ;

         String javaHome = getSystemProperty( "java.home" ) ;

         String fileName = javaHome + File.separator + "lib" + File.separator +

             "orb.properties" ;

         getPropertiesFromFile( defaults, fileName ) ;

         Properties results = new Properties( defaults ) ;

         String userHome = getSystemProperty( "user.home" ) ;

         fileName = userHome + File.separator + "orb.properties" ;

         getPropertiesFromFile( results, fileName ) ;

         return results ;

     }

 }