com.sun.corba.se.impl.javax.rmi

Class PortableRemoteObject

java.lang.Object

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

All Implemented Interfaces:

PortableRemoteObjectDelegate

public class PortableRemoteObject
extends Object
implements PortableRemoteObjectDelegate

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.

Constructor Summary

Constructors

Constructor and Description
PortableRemoteObject()

Method Summary

Modifier and Type	Method and Description
void	connect(Remote target, Remote source) Makes a Remote object ready for remote communication.
void	exportObject(Remote obj) Makes a server object ready to receive remote calls.
Object	narrow(Object narrowFrom, Class narrowTo) Checks to ensure that an object of a remote or abstract interface type can be cast to a desired type.
Remote	toStub(Remote obj) Returns a stub for the given server object.
void	unexportObject(Remote obj) Deregisters a server object from the runtime, allowing the object to become available for garbage collection.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PortableRemoteObject

public PortableRemoteObject()

Method Detail

exportObject

public void exportObject(Remote obj)
                  throws RemoteException

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.

Specified by:

exportObject in interface PortableRemoteObjectDelegate

Parameters:

obj - the server object to export.

Throws:

RemoteException - if export fails.

toStub

public Remote toStub(Remote obj)
              throws NoSuchObjectException

Returns a stub for the given server object.

Specified by:

toStub in interface PortableRemoteObjectDelegate

Parameters:

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 exportObject(java.rmi.Remote).

Returns:

the most derived stub for the object.

Throws:

NoSuchObjectException - if a stub cannot be located for the given server object.

unexportObject

public void unexportObject(Remote obj)
                    throws NoSuchObjectException

Deregisters a server object from the runtime, allowing the object to become available for garbage collection.

Specified by:

unexportObject in interface PortableRemoteObjectDelegate

Parameters:

obj - the object to unexport.

Throws:

NoSuchObjectException - if the remote object is not currently exported.

narrow

public Object narrow(Object narrowFrom,
                     Class narrowTo)
              throws ClassCastException

Checks to ensure that an object of a remote or abstract interface type can be cast to a desired type.

Specified by:

narrow in interface PortableRemoteObjectDelegate

Parameters:

narrowFrom - the object to check.

narrowTo - the desired type.

Returns:

an object which can be cast to the desired type.

Throws:

ClassCastException - if narrowFrom cannot be cast to narrowTo.

connect

public void connect(Remote target,
                    Remote source)
             throws RemoteException

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 Stub#connect method for more information.

Specified by:

connect in interface PortableRemoteObjectDelegate

Parameters:

target - the object to connect.

source - a previously connected object.

Throws:

RemoteException - if source is not connected or if target is already connected to a different ORB than source.