public interface

ActivationMonitor

implements Remote
java.rmi.activation.ActivationMonitor

Class Overview

An ActivationMonitor is specific to an ActivationGroup and is obtained when a group is reported active via a call to ActivationSystem.activeGroup (this is done internally). An activation group is responsible for informing its ActivationMonitor when either: its objects become active or inactive, or the group as a whole becomes inactive.

See Also

Summary

Public Methods
abstract void activeObject(ActivationID id, MarshalledObject<? extends Remote> obj)
Informs that an object is now active.
abstract void inactiveGroup(ActivationGroupID id, long incarnation)
Informs that the group is now inactive.
abstract void inactiveObject(ActivationID id)
An activation group calls its monitor's inactiveObject method when an object in its group becomes inactive (deactivates).

Public Methods

public abstract void activeObject (ActivationID id, MarshalledObject<? extends Remote> obj)

Informs that an object is now active. An ActivationGroup informs its monitor if an object in its group becomes active by other means than being activated directly (i.e., the object is registered and "activated" itself).

Parameters
id the active object's id
obj the marshalled form of the object's stub
Throws
UnknownObjectException if object is unknown
RemoteException if remote call fails

public abstract void inactiveGroup (ActivationGroupID id, long incarnation)

Informs that the group is now inactive. The group will be recreated upon a subsequent request to activate an object within the group. A group becomes inactive when all objects in the group report that they are inactive.

Parameters
id the group's id
incarnation the group's incarnation number
Throws
UnknownGroupException if group is unknown
RemoteException if remote call fails

public abstract void inactiveObject (ActivationID id)

An activation group calls its monitor's inactiveObject method when an object in its group becomes inactive (deactivates). An activation group discovers that an object (that it participated in activating) in its VM is no longer active, via calls to the activation group's inactiveObject method.

The inactiveObject call informs the ActivationMonitor that the remote object reference it holds for the object with the activation identifier, id, is no longer valid. The monitor considers the reference associated with id as a stale reference. Since the reference is considered stale, a subsequent activate call for the same activation identifier results in re-activating the remote object.

Parameters
id the object's activation identifier
Throws
UnknownObjectException if object is unknown
RemoteException if remote call fails