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/* * @(#)PortableRemoteObject.java 1.33 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ /* * Licensed Materials - Property of IBM * RMI-IIOP v1.0 * Copyright IBM Corp. 1998 1999 All Rights Reserved * * US Government Users Restricted Rights - Use, duplication or * disclosure restricted by GSA ADP Schedule Contract with IBM Corp. */ 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 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 ; } }