/*
* Copyright (c) 1999, 2004, 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 org.jboss.com.sun.corba.se.impl.javax.rmi;
import java.rmi.NoSuchObjectException;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.server.ExportException;
import java.rmi.server.UnicastRemoteObject;
import javax.rmi.CORBA.Stub;
import javax.rmi.CORBA.Tie;
import javax.rmi.CORBA.Util;
import org.omg.CORBA.ORB;
import org.omg.CORBA.SystemException;
import org.jboss.com.sun.corba.se.impl.util.RepositoryId;
import org.jboss.com.sun.corba.se.impl.util.Utility;
import org.jboss.com.sun.corba.se.spi.presentation.rmi.StubAdapter;
/**
* 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 implements javax.rmi.CORBA.PortableRemoteObjectDelegate
{
/**
* 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 void exportObject(Remote obj) throws RemoteException
{
if (obj == null)
{
throw new NullPointerException("invalid argument");
}
// Has this object already been exported to IIOP?
if (Util.getTie(obj) != null)
{
// Yes, so this is an error...
throw new ExportException(obj.getClass().getName() + " already exported");
}
// Can we load a Tie?
Tie theTie = Utility.loadTie(obj);
if (theTie != null)
{
// Yes, so export it to IIOP...
Util.registerTarget(theTie, obj);
}
else
{
// No, so export to JRMP. If this is called twice for the
// same object, it will throw an ExportException...
UnicastRemoteObject.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 Remote toStub(Remote obj) throws NoSuchObjectException
{
Remote result = null;
if (obj == null)
{
throw new NullPointerException("invalid argument");
}
// If the class is already an IIOP stub then return it.
if (StubAdapter.isStub(obj))
{
return obj;
}
// If the class is already a JRMP stub then return it.
if (obj instanceof java.rmi.server.RemoteStub)
{
return obj;
}
// Has it been exported to IIOP?
Tie theTie = Util.getTie(obj);
if (theTie != null)
{
result = Utility.loadStub(theTie, null, null, true);
}
else
{
if (Utility.loadTie(obj) == null)
{
result = java.rmi.server.RemoteObject.toStub(obj);
}
}
if (result == null)
{
throw new NoSuchObjectException("object not exported");
}
return result;
}
/**
* 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 void unexportObject(Remote obj) throws NoSuchObjectException
{
if (obj == null)
{
throw new NullPointerException("invalid argument");
}
if (StubAdapter.isStub(obj) || obj instanceof java.rmi.server.RemoteStub)
{
throw new NoSuchObjectException("Can only unexport a server object.");
}
Tie theTie = Util.getTie(obj);
if (theTie != null)
{
Util.unexportObject(obj);
}
else
{
if (Utility.loadTie(obj) == null)
{
UnicastRemoteObject.unexportObject(obj, true);
}
else
{
throw new NoSuchObjectException("Object not exported.");
}
}
}
/**
* 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 java.lang.Object narrow(java.lang.Object narrowFrom, java.lang.Class<?> narrowTo) throws ClassCastException
{
if (narrowFrom == null)
return null;
if (narrowTo == null)
throw new NullPointerException("invalid argument");
try
{
if (narrowTo.isAssignableFrom(narrowFrom.getClass()))
return narrowFrom;
// Is narrowTo an interface that might be implemented by a servant running on iiop?
if (narrowTo.isInterface() && narrowTo != java.io.Serializable.class
&& narrowTo != java.io.Externalizable.class)
{
org.omg.CORBA.Object narrowObj = (org.omg.CORBA.Object) narrowFrom;
// Create an id from the narrowTo type...
String id = RepositoryId.createForAnyType(narrowTo);
if (narrowObj._is_a(id))
{
return Utility.loadStub(narrowObj, narrowTo);
}
else
{
throw new ClassCastException("Object is not of remote type " + narrowTo.getName());
}
}
else
{
throw new ClassCastException("Class " + narrowTo.getName() + " is not a valid remote interface");
}
}
catch(RuntimeException exception){
throw exception;
}
catch (Exception error)
{
ClassCastException cce = new ClassCastException();
cce.initCause(error);
throw cce;
}
}
/**
* 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 void connect(Remote target, Remote source) throws RemoteException
{
if (target == null || source == null)
{
throw new NullPointerException("invalid argument");
}
ORB orb = null;
try
{
if (StubAdapter.isStub(source))
{
orb = StubAdapter.getORB(source);
}
else
{
// Is this a servant that was exported to iiop?
Tie tie = Util.getTie(source);
if (tie == null)
{
/*
* loadTie always succeeds for dynamic RMI-IIOP // No, can we get a tie for it? If not, // assume
* that source is a JRMP object... if (Utility.loadTie(source) != null) { // Yes, so it is an iiop
* object which // has not been exported... throw new RemoteException(
* "'source' object not exported"); }
*/
}
else
{
orb = tie.orb();
}
}
}
catch (SystemException e)
{
throw new RemoteException("'source' object not connected", e);
}
boolean targetIsIIOP = false;
Tie targetTie = null;
if (StubAdapter.isStub(target))
{
targetIsIIOP = true;
}
else
{
targetTie = Util.getTie(target);
if (targetTie != null)
{
targetIsIIOP = true;
}
else
{
/*
* loadTie always succeeds for dynamic RMI-IIOP if (Utility.loadTie(target) != null) { throw new
* RemoteException("'target' servant not exported"); }
*/
}
}
if (!targetIsIIOP)
{
// Yes. Do we have an ORB from the source object? If not, we're done - there is nothing to do to connect a
// JRMP object. If so, it is an error because the caller mixed JRMP and IIOP...
if (orb != null)
{
throw new RemoteException("'source' object exported to IIOP, 'target' is JRMP");
}
}
else
{
// The target object is IIOP. Make sure we have a valid ORB from the source object...
if (orb == null)
{
throw new RemoteException("'source' object is JRMP, 'target' is IIOP");
}
// And, finally, connect it up...
try
{
if (targetTie != null)
{
// Is the tie already connected?
try
{
ORB existingOrb = targetTie.orb();
// Yes. Is it the same orb?
if (existingOrb == orb)
{
// Yes, so nothing to do...
return;
}
else
{
// No, so this is an error...
throw new RemoteException("'target' object was already connected");
}
}
catch (SystemException e)
{
}
// No, so do it...
targetTie.orb(orb);
}
else
{
StubAdapter.connect(target, orb);
}
}
catch (SystemException e)
{
// The stub or tie was already connected...
throw new RemoteException("'target' object was already connected", e);
}
}
}
}