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 }