001 /* DGC.java --
002 Copyright (c) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038 package java.rmi.dgc;
039
040 import java.rmi.Remote;
041 import java.rmi.RemoteException;
042 import java.rmi.server.ObjID;
043
044 /**
045 * The DGC implementation is used for the server side during the distributed
046 * garbage collection. This interface contains the two methods: dirty and clean.
047 * A dirty call is made when a remote reference is unmarshaled in a client. A
048 * corresponding clean call is made by client it no longer uses that remote
049 * reference. A reference to a remote object is also automatically released
050 * after so called lease period that starts after the dirty call is received. It
051 * is the client's responsibility to renew the leases, by making additional
052 * dirty calls before such leases expire.
053 */
054 public interface DGC
055 extends Remote
056 {
057 /**
058 * Mark the given objects referecnes as used on the client side.
059 *
060 * @param ids the ids of the used objects.
061 * @param sequenceNum the number of the call (used to detect and discard late
062 * calls).
063 * @param lease the requested lease
064 * @return the granted lease
065 */
066 Lease dirty(ObjID[] ids, long sequenceNum, Lease lease)
067 throws RemoteException;
068
069 /**
070 * Mark the given objects as no longer used on the client side.
071 *
072 * @param ids the ids of the objects that are no longer used.
073 * @param sequenceNum the number of the call (used to detect and discard late
074 * @param vmid the VMID of the client.
075 * @param strong make the "strong" clean call ("strong" calls are scheduled
076 * after the failed dirty calls).
077 */
078 void clean(ObjID[] ids, long sequenceNum, VMID vmid, boolean strong)
079 throws RemoteException;
080 }