java.rmi.activation: public interface: ActivationMonitor

java.rmi.activation
public interface: ActivationMonitor [javadoc | source]

All Implemented Interfaces:
Remote

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.

Also see:

Activator

ActivationSystem

ActivationGroup

author: Ann - Wollrath

since: 1.2 -

Method from java.rmi.activation.ActivationMonitor Summary:
activeObject, inactiveGroup, inactiveObject

Method from java.rmi.activation.ActivationMonitor Detail:
public void activeObject(ActivationID id, MarshalledObject<Remote> obj) throws UnknownObjectException, RemoteException 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).
public void inactiveGroup(ActivationGroupID id, long incarnation) throws UnknownGroupException, RemoteException 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.
public void inactiveObject(ActivationID id) throws UnknownObjectException, RemoteException 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 An activation group discovers that an object (that it participated in activating) in its VM is no longer active, via calls to the activation group's `inactiveObject` method.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`ActivationMonitor` that the remote object reference it holds for the object with the activation identifier, `id`, is no longer valid.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.

Method from java.rmi.activation.ActivationMonitor Detail:

 public  void activeObject(ActivationID id,
    MarshalledObject<Remote> obj) throws UnknownObjectException, RemoteExceptionInforms 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).

 public  void inactiveGroup(ActivationGroupID id,
    long incarnation) throws UnknownGroupException, RemoteExceptionInforms 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.

 public  void inactiveObject(ActivationID id) throws UnknownObjectException, RemoteExceptionAn 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.