javax.rmi
Class PortableRemoteObject
- java.lang.Object
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- javax.rmi.PortableRemoteObject
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public class PortableRemoteObject extends Object
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 Modifier Constructor and Description protectedPortableRemoteObject()Initializes the object by callingexportObject(this).
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method and Description static voidconnect(Remote target, Remote source)Makes a Remote object ready for remote communication.static voidexportObject(Remote obj)Makes a server object ready to receive remote calls.static Objectnarrow(Object narrowFrom, Class narrowTo)Checks to ensure that an object of a remote or abstract interface type can be cast to a desired type.static RemotetoStub(Remote obj)Returns a stub for the given server object.static voidunexportObject(Remote obj)Deregisters a server object from the runtime, allowing the object to become available for garbage collection.
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Constructor Detail
PortableRemoteObject
protected PortableRemoteObject() throws RemoteExceptionInitializes the object by callingexportObject(this).- Throws:
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RemoteException- if export fails.
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Method Detail
exportObject
public static 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.- Parameters:
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obj- the server object to export. - Throws:
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RemoteException- if export fails.
toStub
public static Remote toStub(Remote obj) throws NoSuchObjectException
Returns a stub for the given server object.- Parameters:
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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:
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NoSuchObjectException- if a stub cannot be located for the given server object.
unexportObject
public static void unexportObject(Remote obj) throws NoSuchObjectException
Deregisters a server object from the runtime, allowing the object to become available for garbage collection.- Parameters:
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obj- the object to unexport. - Throws:
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NoSuchObjectException- if the remote object is not currently exported.
narrow
public static 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.- Parameters:
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narrowFrom- the object to check. -
narrowTo- the desired type. - Returns:
- an object which can be cast to the desired type.
- Throws:
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ClassCastException- if narrowFrom cannot be cast to narrowTo.
connect
public static 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 theStub.connect(org.omg.CORBA.ORB)method for more information.- Parameters:
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target- the object to connect. -
source- a previously connected object. - Throws:
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RemoteException- ifsourceis not connected or iftargetis already connected to a different ORB thansource.
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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