001    /* ActivationMonitor.java -- the RMI activation/inactivation event listener
002       Copyright (c) 1996, 1997, 1998, 1999, 2004, 2006
003       Free Software Foundation, Inc.
004    
005    This file is part of GNU Classpath.
006    
007    GNU Classpath is free software; you can redistribute it and/or modify
008    it under the terms of the GNU General Public License as published by
009    the Free Software Foundation; either version 2, or (at your option)
010    any later version.
011     
012    GNU Classpath is distributed in the hope that it will be useful, but
013    WITHOUT ANY WARRANTY; without even the implied warranty of
014    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015    General Public License for more details.
016    
017    You should have received a copy of the GNU General Public License
018    along with GNU Classpath; see the file COPYING.  If not, write to the
019    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
020    02110-1301 USA.
021    
022    Linking this library statically or dynamically with other modules is
023    making a combined work based on this library.  Thus, the terms and
024    conditions of the GNU General Public License cover the whole
025    combination.
026    
027    As a special exception, the copyright holders of this library give you
028    permission to link this library with independent modules to produce an
029    executable, regardless of the license terms of these independent
030    modules, and to copy and distribute the resulting executable under
031    terms of your choice, provided that you also meet, for each linked
032    independent module, the terms and conditions of the license of that
033    module.  An independent module is a module which is not derived from
034    or based on this library.  If you modify this library, you may extend
035    this exception to your version of the library, but you are not
036    obligated to do so.  If you do not wish to do so, delete this
037    exception statement from your version. */
038    
039    
040    package java.rmi.activation;
041    
042    import java.rmi.MarshalledObject;
043    import java.rmi.Remote;
044    import 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     */
053    public 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    }