Package com.sun.corba.ee.impl.javax.rmi
Class PortableRemoteObject
- java.lang.Object
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- com.sun.corba.ee.impl.javax.rmi.PortableRemoteObject
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- All Implemented Interfaces:
PortableRemoteObjectDelegate
public class PortableRemoteObject extends java.lang.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.
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Constructor Summary
Constructors Constructor Description PortableRemoteObject()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
connect(java.rmi.Remote target, java.rmi.Remote source)
Makes a Remote object ready for remote communication.void
exportObject(java.rmi.Remote obj)
Makes a server object ready to receive remote calls.java.lang.Object
narrow(java.lang.Object narrowFrom, java.lang.Class narrowTo)
Checks to ensure that an object of a remote or abstract interface type can be cast to a desired type.java.rmi.Remote
toStub(java.rmi.Remote obj)
Returns a stub for the given server object.void
unexportObject(java.rmi.Remote obj)
Deregisters a server object from the runtime, allowing the object to become available for garbage collection.
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Method Detail
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exportObject
public void exportObject(java.rmi.Remote obj) throws java.rmi.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 interfacePortableRemoteObjectDelegate
- Parameters:
obj
- the server object to export.- Throws:
java.rmi.RemoteException
- if export fails.
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toStub
public java.rmi.Remote toStub(java.rmi.Remote obj) throws java.rmi.NoSuchObjectException
Returns a stub for the given server object.- Specified by:
toStub
in interfacePortableRemoteObjectDelegate
- 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 toexportObject(java.rmi.Remote)
.- Returns:
- the most derived stub for the object.
- Throws:
java.rmi.NoSuchObjectException
- if a stub cannot be located for the given server object.
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unexportObject
public void unexportObject(java.rmi.Remote obj) throws java.rmi.NoSuchObjectException
Deregisters a server object from the runtime, allowing the object to become available for garbage collection.- Specified by:
unexportObject
in interfacePortableRemoteObjectDelegate
- Parameters:
obj
- the object to unexport.- Throws:
java.rmi.NoSuchObjectException
- if the remote object is not currently exported.
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narrow
public java.lang.Object narrow(java.lang.Object narrowFrom, java.lang.Class narrowTo) throws java.lang.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 interfacePortableRemoteObjectDelegate
- Parameters:
narrowFrom
- the object to check.narrowTo
- the desired type.- Returns:
- an object which can be cast to the desired type.
- Throws:
java.lang.ClassCastException
- if narrowFrom cannot be cast to narrowTo.
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connect
public void connect(java.rmi.Remote target, java.rmi.Remote source) throws java.rmi.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 theStub.connect(org.omg.CORBA.ORB)
method for more information.- Specified by:
connect
in interfacePortableRemoteObjectDelegate
- Parameters:
target
- the object to connect.source
- a previously connected object.- Throws:
java.rmi.RemoteException
- ifsource
is not connected or iftarget
is already connected to a different ORB thansource
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