java.rmi.server
Class UnicastRemoteObject

java.lang.Object
  |
  +--java.rmi.server.RemoteObject
        |
        +--java.rmi.server.RemoteServer
              |
              +--java.rmi.server.UnicastRemoteObject

Direct Known Subclasses:

ActivationGroup

public class UnicastRemoteObject

extends RemoteServer

The UnicastRemoteObject class defines a non-replicated remote object whose references are valid only while the server process is alive. The UnicastRemoteObject class provides support for point-to-point active object references (invocations, parameters, and results) using TCP streams.

Objects that require remote behavior should extend RemoteObject, typically via UnicastRemoteObject. If UnicastRemoteObject is not extended, the implementation class must then assume the responsibility for the correct semantics of the hashCode, equals, and toString methods inherited from the Object class, so that they behave appropriately for remote objects.

Since:

JDK1.1

See Also:

RemoteServer, RemoteObject, Serialized Form

Fields inherited from class java.rmi.server.RemoteObject

ref

Constructor Summary

protected	UnicastRemoteObject() Create and export a new UnicastRemoteObject object using an anonymous port.
protected	UnicastRemoteObject(int port) Create and export a new UnicastRemoteObject object using the particular supplied port.
protected	UnicastRemoteObject(int port, RMIClientSocketFactory csf, RMIServerSocketFactory ssf) Create and export a new UnicastRemoteObject object using the particular supplied port and socket factories

Method Summary

Object	clone() Returns a clone of the remote object that is distinct from the original.
static RemoteStub	exportObject(Remote obj) Export the remote object to make it available to receive incoming calls, using an anonymous port.
static Remote	exportObject(Remote obj, int port) Export the remote object to make it available to receive incoming calls, using the particular supplied port.
static Remote	exportObject(Remote obj, int port, RMIClientSocketFactory csf, RMIServerSocketFactory ssf) Export the remote object to make it available to receive incoming calls, using a transport specified by the given socket factory.
static boolean	unexportObject(Remote obj, boolean force) Remove the remote object, obj, from the RMI runtime.

Methods inherited from class java.rmi.server.RemoteServer

getClientHost, getLog, setLog

Methods inherited from class java.rmi.server.RemoteObject

equals, getRef, hashCode, toString, toStub

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

UnicastRemoteObject

protected UnicastRemoteObject()
                       throws RemoteException

Create and export a new UnicastRemoteObject object using an anonymous port.

Since:

JDK1.1

UnicastRemoteObject

protected UnicastRemoteObject(int port)
                       throws RemoteException

Create and export a new UnicastRemoteObject object using the particular supplied port.

Parameters:

port - the port number on which the remote object receives calls (if port is zero, an anonymous port is chosen)

Since:

JDK1.2

UnicastRemoteObject

protected UnicastRemoteObject(int port,
                              RMIClientSocketFactory csf,
                              RMIServerSocketFactory ssf)
                       throws RemoteException

Create and export a new UnicastRemoteObject object using the particular supplied port and socket factories

Parameters:

port - the port number on which the remote object receives calls (if port is zero, an anonymous port is chosen)

csf - the client-side socket factory for making calls to the remote object

ssf - the server-side socket factory for receiving remote calls

Since:

JDK1.2

Method Detail

clone

public Object clone()
             throws CloneNotSupportedException

Returns a clone of the remote object that is distinct from the original.

Returns:

the new remote object

Throws:

CloneNotSupportedException - if clone failed due to a RemoteException.

Overrides:

clone in class Object

Since:

JDK1.1

exportObject

public static RemoteStub exportObject(Remote obj)
                               throws RemoteException

Export the remote object to make it available to receive incoming calls, using an anonymous port.

Parameters:

obj - the remote object to be exported

Throws:

RemoteException - if export fails

Since:

JDK1.1

exportObject

public static Remote exportObject(Remote obj,
                                  int port)
                           throws RemoteException

Export the remote object to make it available to receive incoming calls, using the particular supplied port.

Parameters:

obj - the remote object to be exported

port - the port to export the object on

Throws:

RemoteException - if export fails

Since:

JDK1.2

exportObject

public static Remote exportObject(Remote obj,
                                  int port,
                                  RMIClientSocketFactory csf,
                                  RMIServerSocketFactory ssf)
                           throws RemoteException

Export the remote object to make it available to receive incoming calls, using a transport specified by the given socket factory.

Parameters:

obj - the remote object to be exported

port - the port to export the object on

csf - the client-side socket factory for making calls to the remote object

ssf - the server-side socket factory for receiving remote calls

Throws:

RemoteException - if export fails

Since:

JDK1.2

unexportObject

public static boolean unexportObject(Remote obj,
                                     boolean force)
                              throws NoSuchObjectException

Remove the remote object, obj, from the RMI runtime. If successful, the object can no longer accept incoming RMI calls. If the force parameter is true, the object is forcibly unexported even if there are pending calls to the remote object or the remote object still has calls in progress. If the force parameter is false, the object is only unexported if there are no pending or in progress calls to the object.

Parameters:

obj - the remote object to be unexported

force - if true, unexports the object even if there are pending or in-progress calls; if false, only unexports the object if there are no pending or in-progress calls

Returns:

true if operation is successful, false otherwise

Throws:

NoSuchObjectException - if the remote object is not currently exported

Since:

JDK1.2