ActivationMonitor.java revision 0
0N/A * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 0N/A * published by the Free Software Foundation. Sun designates this 0N/A * particular file as subject to the "Classpath" exception as provided 0N/A * by Sun in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 0N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 0N/A * CA 95054 USA or visit www.sun.com if you need additional information or 0N/A * have any questions. 0N/A * An <code>ActivationMonitor</code> is specific to an 0N/A * <code>ActivationGroup</code> and is obtained when a group is 0N/A * reported active via a call to 0N/A * <code>ActivationSystem.activeGroup</code> (this is done 0N/A * internally). An activation group is responsible for informing its 0N/A * <code>ActivationMonitor</code> when either: its objects become active or 0N/A * inactive, or the group as a whole becomes inactive. 0N/A * @author Ann Wollrath 0N/A * @see ActivationSystem 0N/A * @see ActivationGroup 0N/A * An activation group calls its monitor's 0N/A * <code>inactiveObject</code> method when an object in its group 0N/A * becomes inactive (deactivates). An activation group discovers 0N/A * that an object (that it participated in activating) in its VM 0N/A * is no longer active, via calls to the activation group's 0N/A * <code>inactiveObject</code> method. <p> 0N/A * The <code>inactiveObject</code> call informs the 0N/A * <code>ActivationMonitor</code> that the remote object reference 0N/A * it holds for the object with the activation identifier, 0N/A * <code>id</code>, is no longer valid. The monitor considers the 0N/A * reference associated with <code>id</code> as a stale reference. 0N/A * Since the reference is considered stale, a subsequent 0N/A * <code>activate</code> call for the same activation identifier 0N/A * results in re-activating the remote object.<p> 0N/A * @param id the object's activation identifier 0N/A * @exception UnknownObjectException if object is unknown 0N/A * @exception RemoteException if remote call fails 0N/A * Informs that an object is now active. An <code>ActivationGroup</code> 0N/A * informs its monitor if an object in its group becomes active by 0N/A * other means than being activated directly (i.e., the object 0N/A * is registered and "activated" itself). 0N/A * @param id the active object's id 0N/A * @param obj the marshalled form of the object's stub 0N/A * @exception UnknownObjectException if object is unknown 0N/A * @exception RemoteException if remote call fails 0N/A * Informs that the group is now inactive. The group will be 0N/A * recreated upon a subsequent request to activate an object 0N/A * within the group. A group becomes inactive when all objects 0N/A * in the group report that they are inactive. 0N/A * @param id the group's id 0N/A * @param incarnation the group's incarnation number 0N/A * @exception UnknownGroupException if group is unknown 0N/A * @exception RemoteException if remote call fails