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Java 2 Platform SE v1.3.1: Class UnicastRemoteObject
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JavaTM 2 Platform
Std. Ed. v1.3.1
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java.rmi.server
Class UnicastRemoteObject

java.lang.Object
  |
  +--java.rmi.server.RemoteObject
        |
        +--java.rmi.server.RemoteServer
              |
              +--java.rmi.server.UnicastRemoteObject
All Implemented Interfaces:
Remote, Serializable
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.
Throws:
RemoteException - if failed to export object
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)
Throws:
RemoteException - if failed to export object
Since:
1.2

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
Throws:
RemoteException - if failed to export object
Since:
1.2
Method Detail

clone

public Object clone()
             throws CloneNotSupportedException
Returns a clone of the remote object that is distinct from the original.
Overrides:
clone in class Object
Returns:
the new remote object
Throws:
CloneNotSupportedException - if clone failed due to a RemoteException.
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
Returns:
remote object stub
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
Returns:
remote object stub
Throws:
RemoteException - if export fails
Since:
1.2

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
Returns:
remote object stub
Throws:
RemoteException - if export fails
Since:
1.2

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:
1.2
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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