corba/src/share/classes/javax/rmi/PortableRemoteObject.java - edge/openjdk - Git at Google

 /*
  * Copyright (c) 1998, 2013, 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 final javax.rmi.CORBA.PortableRemoteObjectDelegate proDelegate;

     private static final String PortableRemoteObjectClassKey =
             "javax.rmi.CORBA.PortableRemoteObjectClass";

     static {
         proDelegate = (javax.rmi.CORBA.PortableRemoteObjectDelegate)
             createDelegate(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 createDelegate(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) {
             return new com.sun.corba.se.impl.javax.rmi.PortableRemoteObject();
         }

         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 ;
     }
 }
	/*
	* Copyright (c) 1998, 2013, 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 final javax.rmi.CORBA.PortableRemoteObjectDelegate proDelegate;

	private static final String PortableRemoteObjectClassKey =
	"javax.rmi.CORBA.PortableRemoteObjectClass";

	static {
	proDelegate = (javax.rmi.CORBA.PortableRemoteObjectDelegate)
	createDelegate(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 createDelegate(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) {
	return new com.sun.corba.se.impl.javax.rmi.PortableRemoteObject();
	}

	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 ;
	}
	}