Class PortableRemoteObject

protected PortableRemoteObject()
            throws RemoteException

The protected constructor calls exportObject (this).

Throws:

RemoteException - if the exportObject(this) throws one.

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

Makes the remote object a_target ready for remote communication using the same communications runtime as for the passed a_source parameter. The a_target is connected to the same ORB (and, if applicable, to the same POA) as the a_source.

Parameters:

target - the target to connect to ORB, must be an instance of either ObjectImpl (Stubs and old-style ties) or Tie.

source - the object, providing the connection information, must be an instance of either ObjectImpl (Stubs and old-style ties) or Servant (the next-generation Ties supporting POA).

Throws:

RemoteException - if the target is already connected to another ORB.

public static void exportObject(Remote object)
            throws RemoteException

Makes a server object ready for remote calls. The subclasses of PortableRemoteObject do not need to call this method, as it is called by the constructor.

This method only creates a tie object and caches it for future usage. The created tie does not have a delegate or an ORB associated.

Parameters:

object - the object to export.

Throws:

RemoteException - if export fails due any reason.

public static Object narrow(Object object,
                            Class<T> narrowToInstaceOf)
            throws ClassCastException

Narrows the passed object to conform to the given interface or IDL type. In RMI-IIOP, this method replaces the narrow(org.omg.CORBA.Object) method that was present in the CORBA Helpers. This method frequently returns different instance and cannot be replaced by the direct cast. The typical narrowing cases (all supported by GNU Classpath) are:

• A CORBA object (for instance, returned by the ORB.string_to_object(String) or from the naming service) can be narrowed into interface, derived from Remote. The method will try to locate an appropriate Stub by the name pattern (_*_Stub). If the object being narrowed is connected to an ORB, the returned instance will inherit that connection, representing the same remote (or local) object, but now with the possibility to invoke remote methods.
• A CORBA object may be directly narrowed into the appropriate Stub class, if it is and passed as a second parameter. This allows to use non-standard stubs without parameterless constructors.
• Any two classes, derived from the ObjectImpl (may be Stub's) can be narrowed one into another (a delegate is transferred).
• An implementation of Remote can be narrowed into Tie that can later connected to an ORB, making the methods accessible remotely. The Remote being narrowed normally provides a local implementation, but you can also narrow remote Stub, creating "forwarding Tie".
• null is narrowed into null regardless of the second parameter.
• A Tie can be narrowed into Remote, representing the implementation for this Tie (if one is set).

Parameters:

object - the object like CORBA Object, Stub or Remote that must be narrowed to the given interface.

narrowToInstaceOf - the class of the interface to that the object must be narrowed.

Returns:

On success, an object of type narrowTo or null, if narrowFrom = null.

Throws:

ClassCastException - if no narrowing is possible.

public static Remote toStub(Remote targetImpl)
            throws NoSuchObjectException

Takes a server implementation object (name pattern *imp) and returns a stub object that can be used to access that server object (target), name (pattern _*_Stub). The returned stub is not connected to any ORB and must be explicitly connected using connect(Remote,Remote).

The method signature prevents it from returning stubs that does not implement Remote (ClassCastException will be thrown).

Parameters:

Returns:

a stub object that can be used to access that server object.

Throws:

NoSuchObjectException - if a stub class cannot be located by supposed name pattern, or an instance of stub fails to be instantiated.

ClassCastException - if the stub class can be located, but it does not inherit from Remote.

BAD_PARAM - if the name of the passed class does not match the implementation name pattern (does not end by 'Impl').

public static void unexportObject(Remote object)
            throws NoSuchObjectException

Deregister a currently exported server object from the ORB runtimes. The object to becomes available for garbage collection. This is usually impemented via Util.unexportObject(Remote)

Parameters:

object - the object to unexport.

Throws:

NoSuchObjectException - if the passed object is not currently exported.