1 /* DGC.java -- 2 Copyright (c) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 package java.rmi.dgc; 39 40 import java.rmi.Remote; 41 import java.rmi.RemoteException; 42 import java.rmi.server.ObjID; 43 44 /** 45 * The DGC implementation is used for the server side during the distributed 46 * garbage collection. This interface contains the two methods: dirty and clean. 47 * A dirty call is made when a remote reference is unmarshaled in a client. A 48 * corresponding clean call is made by client it no longer uses that remote 49 * reference. A reference to a remote object is also automatically released 50 * after so called lease period that starts after the dirty call is received. It 51 * is the client's responsibility to renew the leases, by making additional 52 * dirty calls before such leases expire. 53 */ 54 public interface DGC 55 extends Remote 56 { 57 /** 58 * Mark the given objects referecnes as used on the client side. 59 * 60 * @param ids the ids of the used objects. 61 * @param sequenceNum the number of the call (used to detect and discard late 62 * calls). 63 * @param lease the requested lease 64 * @return the granted lease 65 */ dirty(ObjID[] ids, long sequenceNum, Lease lease)66 Lease dirty(ObjID[] ids, long sequenceNum, Lease lease) 67 throws RemoteException; 68 69 /** 70 * Mark the given objects as no longer used on the client side. 71 * 72 * @param ids the ids of the objects that are no longer used. 73 * @param sequenceNum the number of the call (used to detect and discard late 74 * @param vmid the VMID of the client. 75 * @param strong make the "strong" clean call ("strong" calls are scheduled 76 * after the failed dirty calls). 77 */ clean(ObjID[] ids, long sequenceNum, VMID vmid, boolean strong)78 void clean(ObjID[] ids, long sequenceNum, VMID vmid, boolean strong) 79 throws RemoteException; 80 } 81