Package javax.rmi

Class PortableRemoteObject

java.lang.Object
javax.rmi.PortableRemoteObject
Direct Known Subclasses:
InitialGroupInfoService.InitialGISImpl

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.
  • Field Details

  • Constructor Details

    • PortableRemoteObject

      protected PortableRemoteObject() throws RemoteException
      Initializes the object by calling exportObject(this).
      Throws:
      RemoteException - if export fails.
  • Method Details

    • 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:
      obj - the server object to export.
      Throws:
      RemoteException - if export fails.
    • toStub

      public static Remote toStub(Remote obj) throws NoSuchObjectException
      Returns a stub for the given server object.
      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 to exportObject(java.rmi.Remote).
      Returns:
      the most derived stub for the object.
      Throws:
      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:
      obj - the object to unexport.
      Throws:
      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:
      narrowFrom - the object to check.
      narrowTo - the desired type.
      Returns:
      an object which can be cast to the desired type.
      Throws:
      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 the Stub.connect(org.omg.CORBA.ORB) method for more information.
      Parameters:
      target - the object to connect.
      source - a previously connected object.
      Throws:
      RemoteException - if source is not connected or if target is already connected to a different ORB than source.
    • createDelegateIfSpecified

      private static Object createDelegateIfSpecified(String classKey)
    • loadDelegateClass

      private static Class loadDelegateClass(String className) throws ClassNotFoundException
      Throws:
      ClassNotFoundException
    • getORBPropertiesFile

      private static Properties getORBPropertiesFile()
      Load the orb.properties file.