001/* ActivationMonitor.java -- the RMI activation/inactivation event listener
002   Copyright (c) 1996, 1997, 1998, 1999, 2004, 2006
003   Free Software Foundation, Inc.
004
005This file is part of GNU Classpath.
006
007GNU Classpath is free software; you can redistribute it and/or modify
008it under the terms of the GNU General Public License as published by
009the Free Software Foundation; either version 2, or (at your option)
010any later version.
011
012GNU Classpath is distributed in the hope that it will be useful, but
013WITHOUT ANY WARRANTY; without even the implied warranty of
014MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015General Public License for more details.
016
017You should have received a copy of the GNU General Public License
018along with GNU Classpath; see the file COPYING.  If not, write to the
019Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02002110-1301 USA.
021
022Linking this library statically or dynamically with other modules is
023making a combined work based on this library.  Thus, the terms and
024conditions of the GNU General Public License cover the whole
025combination.
026
027As a special exception, the copyright holders of this library give you
028permission to link this library with independent modules to produce an
029executable, regardless of the license terms of these independent
030modules, and to copy and distribute the resulting executable under
031terms of your choice, provided that you also meet, for each linked
032independent module, the terms and conditions of the license of that
033module.  An independent module is a module which is not derived from
034or based on this library.  If you modify this library, you may extend
035this exception to your version of the library, but you are not
036obligated to do so.  If you do not wish to do so, delete this
037exception statement from your version. */
038
039
040package java.rmi.activation;
041
042import java.rmi.MarshalledObject;
043import java.rmi.Remote;
044import java.rmi.RemoteException;
045
046/**
047 * The activation and inactivation event listener. The group obtains this
048 * listener via {@link ActivationSystem#activeGroup} and must notify it
049 * when the group objects are activated or inactivated and also when the
050 * whole group becomes inactive.
051 * @author root.
052 */
053public interface ActivationMonitor extends Remote
054{
055  /**
056   * Informs that the object is now active.
057   *
058   * @param id the activation id of the object that is now active
059   * @throws UnknownObjectException is such object is not known in this group
060   * @throws RemoteException if remote call fails
061   */
062  void activeObject (ActivationID id, MarshalledObject<? extends Remote> obj)
063    throws UnknownObjectException, RemoteException;
064
065  /**
066   * Informs that the object is not inactive.
067   *
068   * @param id the activation id of the object that is now inactive
069   * @throws UnknownObjectException is such object is not known in this group
070   * @throws RemoteException if remote call fails
071   */
072  void inactiveObject (ActivationID id)
073    throws UnknownObjectException, RemoteException;
074
075  /**
076   * Informs that the whole group is now inactive because all group objects are
077   * inactive. The group will be recreated upon the later request to activate
078   * any object, belonging to the group.
079   *
080   * @param groupId the group id
081   * @param incarnation the group incarnation number
082   * @throws UnknownGroupException if the group id is not known
083   * @throws RemoteException if the remote call fails
084   */
085  void inactiveGroup (ActivationGroupID groupId, long incarnation)
086  throws UnknownGroupException, RemoteException;
087}