author | msheppar |
Thu, 01 Jun 2017 17:49:34 +0100 | |
changeset 45443 | 57dbb6453a4d |
parent 25862 | a5e25d68f971 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* Licensed Materials - Property of IBM |
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* RMI-IIOP v1.0 |
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* Copyright IBM Corp. 1998 1999 All Rights Reserved |
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* |
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*/ |
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package javax.rmi; |
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import java.lang.reflect.Method ; |
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import org.omg.CORBA.INITIALIZE; |
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import javax.rmi.CORBA.Util; |
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import java.rmi.RemoteException; |
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import java.rmi.NoSuchObjectException; |
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import java.rmi.Remote; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.util.Properties; |
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import java.net.MalformedURLException ; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.rmi.server.RMIClassLoader; |
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import com.sun.corba.se.impl.orbutil.GetPropertyAction; |
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/** |
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* Server implementation objects may either inherit from |
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* javax.rmi.PortableRemoteObject or they may implement a remote interface |
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* and then use the exportObject method to register themselves as a server object. |
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* The toStub method takes a server implementation and returns a stub that |
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* can be used to access that server object. |
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* The connect method makes a Remote object ready for remote communication. |
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* The unexportObject method is used to deregister a server object, allowing it to become |
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* available for garbage collection. |
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* The narrow method takes an object reference or abstract interface type and |
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* attempts to narrow it to conform to |
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* the given interface. If the operation is successful the result will be an |
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* object of the specified type, otherwise an exception will be thrown. |
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* |
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* <p>See also {@extLink rmi_iiop_guides RMI-IIOP developer's guides}.</p> |
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*/ |
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public class PortableRemoteObject { |
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private static final javax.rmi.CORBA.PortableRemoteObjectDelegate proDelegate; |
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private static final String PortableRemoteObjectClassKey = |
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"javax.rmi.CORBA.PortableRemoteObjectClass"; |
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static { |
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proDelegate = (javax.rmi.CORBA.PortableRemoteObjectDelegate) |
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createDelegate(PortableRemoteObjectClassKey); |
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} |
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/** |
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* Initializes the object by calling <code>exportObject(this)</code>. |
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* @exception RemoteException if export fails. |
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*/ |
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protected PortableRemoteObject() throws RemoteException { |
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if (proDelegate != null) { |
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PortableRemoteObject.exportObject((Remote)this); |
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} |
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} |
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/** |
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* Makes a server object ready to receive remote calls. Note |
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* that subclasses of PortableRemoteObject do not need to call this |
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* method, as it is called by the constructor. |
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* @param obj the server object to export. |
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* @exception RemoteException if export fails. |
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*/ |
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public static void exportObject(Remote obj) |
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throws RemoteException { |
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// Let the delegate do everything, including error handling. |
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if (proDelegate != null) { |
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proDelegate.exportObject(obj); |
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} |
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} |
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/** |
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* Returns a stub for the given server object. |
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* @param obj the server object for which a stub is required. Must either be a subclass |
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* of PortableRemoteObject or have been previously the target of a call to |
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* {@link #exportObject}. |
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* @return the most derived stub for the object. |
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* @exception NoSuchObjectException if a stub cannot be located for the given server object. |
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*/ |
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public static Remote toStub (Remote obj) |
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throws NoSuchObjectException { |
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if (proDelegate != null) { |
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return proDelegate.toStub(obj); |
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} |
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return null; |
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} |
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/** |
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* Deregisters a server object from the runtime, allowing the object to become |
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* available for garbage collection. |
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* @param obj the object to unexport. |
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* @exception NoSuchObjectException if the remote object is not |
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* currently exported. |
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*/ |
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public static void unexportObject(Remote obj) |
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throws NoSuchObjectException { |
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if (proDelegate != null) { |
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proDelegate.unexportObject(obj); |
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} |
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} |
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/** |
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* Checks to ensure that an object of a remote or abstract interface type |
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* can be cast to a desired type. |
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* @param narrowFrom the object to check. |
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* @param narrowTo the desired type. |
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* @return an object which can be cast to the desired type. |
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* @throws ClassCastException if narrowFrom cannot be cast to narrowTo. |
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*/ |
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public static java.lang.Object narrow ( java.lang.Object narrowFrom, |
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java.lang.Class narrowTo) |
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throws ClassCastException { |
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if (proDelegate != null) { |
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return proDelegate.narrow(narrowFrom, narrowTo); |
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} |
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return null; |
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} |
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/** |
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* Makes a Remote object ready for remote communication. This normally |
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* happens implicitly when the object is sent or received as an argument |
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* on a remote method call, but in some circumstances it is useful to |
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* perform this action by making an explicit call. See the |
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* {@link javax.rmi.CORBA.Stub#connect} method for more information. |
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* @param target the object to connect. |
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* @param source a previously connected object. |
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* @throws RemoteException if <code>source</code> is not connected |
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* or if <code>target</code> is already connected to a different ORB than |
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* <code>source</code>. |
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*/ |
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public static void connect (Remote target, Remote source) |
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throws RemoteException { |
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if (proDelegate != null) { |
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proDelegate.connect(target, source); |
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} |
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} |
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// Same code as in javax.rmi.CORBA.Util. Can not be shared because they |
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// are in different packages and the visibility needs to be package for |
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// security reasons. If you know a better solution how to share this code |
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// then remove it from here. |
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private static Object createDelegate(String classKey) { |
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String className = (String) |
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AccessController.doPrivileged(new GetPropertyAction(classKey)); |
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if (className == null) { |
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Properties props = getORBPropertiesFile(); |
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if (props != null) { |
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className = props.getProperty(classKey); |
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} |
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} |
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if (className == null) { |
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return new com.sun.corba.se.impl.javax.rmi.PortableRemoteObject(); |
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} |
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try { |
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return (Object) loadDelegateClass(className).newInstance(); |
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} catch (ClassNotFoundException ex) { |
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INITIALIZE exc = new INITIALIZE( "Cannot instantiate " + className); |
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exc.initCause( ex ) ; |
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throw exc ; |
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} catch (Exception ex) { |
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INITIALIZE exc = new INITIALIZE( "Error while instantiating" + className); |
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exc.initCause( ex ) ; |
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throw exc ; |
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} |
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} |
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private static Class loadDelegateClass( String className ) throws ClassNotFoundException |
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{ |
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try { |
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ClassLoader loader = Thread.currentThread().getContextClassLoader(); |
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return Class.forName(className, false, loader); |
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} catch (ClassNotFoundException e) { |
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// ignore, then try RMIClassLoader |
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} |
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try { |
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return RMIClassLoader.loadClass(className); |
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} catch (MalformedURLException e) { |
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String msg = "Could not load " + className + ": " + e.toString(); |
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ClassNotFoundException exc = new ClassNotFoundException( msg ) ; |
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throw exc ; |
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} |
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} |
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/** |
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* Load the orb.properties file. |
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*/ |
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private static Properties getORBPropertiesFile () { |
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return (Properties) AccessController.doPrivileged(new GetORBPropertiesFileAction()); |
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} |
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} |
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class GetORBPropertiesFileAction implements PrivilegedAction { |
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private boolean debug = false ; |
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public GetORBPropertiesFileAction () { |
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} |
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private String getSystemProperty(final String name) { |
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// This will not throw a SecurityException because this |
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// class was loaded from rt.jar using the bootstrap classloader. |
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String propValue = (String) AccessController.doPrivileged( |
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new PrivilegedAction() { |
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public java.lang.Object run() { |
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return System.getProperty(name); |
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} |
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} |
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); |
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return propValue; |
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} |
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private void getPropertiesFromFile( Properties props, String fileName ) |
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{ |
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try { |
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File file = new File( fileName ) ; |
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if (!file.exists()) |
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return ; |
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FileInputStream in = new FileInputStream( file ) ; |
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try { |
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props.load( in ) ; |
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} finally { |
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in.close() ; |
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} |
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} catch (Exception exc) { |
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if (debug) |
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System.out.println( "ORB properties file " + fileName + |
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" not found: " + exc) ; |
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} |
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} |
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public Object run() |
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{ |
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Properties defaults = new Properties() ; |
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String javaHome = getSystemProperty( "java.home" ) ; |
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String fileName = javaHome + File.separator + "lib" + File.separator + |
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"orb.properties" ; |
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getPropertiesFromFile( defaults, fileName ) ; |
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Properties results = new Properties( defaults ) ; |
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String userHome = getSystemProperty( "user.home" ) ; |
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fileName = userHome + File.separator + "orb.properties" ; |
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getPropertiesFromFile( results, fileName ) ; |
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return results ; |
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} |
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} |