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package java.rmi.activation;

import java.rmi.MarshalledObject;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.activation.UnknownGroupException;
import java.rmi.activation.UnknownObjectException;


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.

Author:     Ann Wollrath
See Also:
Since:      1.2
/**
 * An <code>ActivationMonitor</code> is specific to an
 * <code>ActivationGroup</code> and is obtained when a group is
 * reported active via a call to
 * <code>ActivationSystem.activeGroup</code> (this is done
 * internally). An activation group is responsible for informing its
 * <code>ActivationMonitor</code> when either: its objects become active or
 * inactive, or the group as a whole becomes inactive.
 *
 * @author      Ann Wollrath
 * @see         Activator
 * @see         ActivationSystem
 * @see         ActivationGroup
 * @since       1.2
 */
public interface ActivationMonitor extends Remote {

   
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is no longer active, via calls to the activation group's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id, is no longer valid.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.

Params:
  • id – the object's activation identifier
Throws:
Since:1.2
/**
     * An activation group calls its monitor's
     * <code>inactiveObject</code> 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     * is no longer active, via calls to the activation group's
     * <code>inactiveObject</code> method. <p>
     *
     * The <code>inactiveObject</code> call informs the
     * <code>ActivationMonitor</code> that the remote object reference
     * it holds for the object with the activation identifier,
     * <code>id</code>, is no longer valid. The monitor considers the
     * reference associated with <code>id</code> as a stale reference.
     * Since the reference is considered stale, a subsequent
     * <code>activate</code> call for the same activation identifier
     * results in re-activating the remote object.
     *
     * @param id the object's activation identifier
     * @exception UnknownObjectException if object is unknown
     * @exception RemoteException if remote call fails
     * @since 1.2
     */
    public void inactiveObject(ActivationID id)
        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).

Params:
  • id – the active object's id
  • obj – the marshalled form of the object's stub
Throws:
Since:1.2
/**
     * Informs that an object is now active. An <code>ActivationGroup</code>
     * 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).
     *
     * @param id the active object's id
     * @param obj the marshalled form of the object's stub
     * @exception UnknownObjectException if object is unknown
     * @exception RemoteException if remote call fails
     * @since 1.2
     */
    public void activeObject(ActivationID id,
                             MarshalledObject<? extends Remote> obj)
        throws UnknownObjectException, 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.

Params:
  • id – the group's id
  • incarnation – the group's incarnation number
Throws:
Since:1.2
/**
     * 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.
     *
     * @param id the group's id
     * @param incarnation the group's incarnation number
     * @exception UnknownGroupException if group is unknown
     * @exception RemoteException if remote call fails
     * @since 1.2
     */
    public void inactiveGroup(ActivationGroupID id,
                              long incarnation)
        throws UnknownGroupException, RemoteException;

}