001/* DGC.java -- 002 Copyright (c) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package java.rmi.dgc; 039 040import java.rmi.Remote; 041import java.rmi.RemoteException; 042import 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 */ 054public 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}