Module java.rmi
Package java.rmi.activation

Class ActivationID

java.lang.Object
java.rmi.activation.ActivationID
All Implemented Interfaces:
Serializable
public class ActivationID
extends Object
implements Serializable
Activation makes use of special identifiers to denote remote objects that can be activated over time. An activation identifier (an instance of the class ActivationID) contains several pieces of information needed for activating an object:
  • a remote reference to the object's activator (a RemoteRef instance), and
  • a unique identifier (a UID instance) for the object.

An activation identifier for an object can be obtained by registering an object with the activation system. Registration is accomplished in a few ways:

  • via the Activatable.register method
  • via the first Activatable constructor (that takes three arguments and both registers and exports the object, and
  • via the first Activatable.exportObject method that takes the activation descriptor, object and port as arguments; this method both registers and exports the object.

Since:
1.2
See Also:
Activatable, Serialized Form

  • Constructor Summary

    Constructors 
    Constructor Description
    ActivationID​(Activator activator)
    The constructor for ActivationID takes a single argument, activator, that specifies a remote reference to the activator responsible for activating the object associated with this identifier.

  • Method Summary

    Modifier and Type Method Description
    Remote activate​(boolean force)
    Activate the object for this id.
    boolean equals​(Object obj)
    Compares two activation ids for content equality.
    int hashCode()
    Returns a hashcode for the activation id.

    Methods declared in class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • ActivationID

      public ActivationID​(Activator activator)
      The constructor for ActivationID takes a single argument, activator, that specifies a remote reference to the activator responsible for activating the object associated with this identifier. An instance of ActivationID is globally unique.
      Parameters:
      activator - reference to the activator responsible for activating the object
      Throws:
      UnsupportedOperationException - if and only if activation is not supported by this implementation
      Since:
      1.2

  • Method Details

    • activate

      public Remote activate​(boolean force) throws ActivationException, UnknownObjectException, RemoteException
      Activate the object for this id.
      Parameters:
      force - if true, forces the activator to contact the group when activating the object (instead of returning a cached reference); if false, returning a cached value is acceptable.
      Returns:
      the reference to the active remote object
      Throws:
      ActivationException - if activation fails
      UnknownObjectException - if the object is unknown
      RemoteException - if remote call fails
      Since:
      1.2

    • hashCode

      public int hashCode()
      Returns a hashcode for the activation id. Two identifiers that refer to the same remote object will have the same hash code.
      Overrides:
      hashCode in class Object
      Returns:
      a hash code value for this object.
      Since:
      1.2
      See Also:
      Hashtable

    • equals

      public boolean equals​(Object obj)
      Compares two activation ids for content equality. Returns true if both of the following conditions are true: 1) the unique identifiers equivalent (by content), and 2) the activator specified in each identifier refers to the same remote object.
      Overrides:
      equals in class Object
      Parameters:
      obj - the Object to compare with
      Returns:
      true if these Objects are equal; false otherwise.
      Since:
      1.2
      See Also:
      Hashtable