| /* |
| Copyright (c) 1996, 1997, 1998, 1999, 2002 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.java.rmi.dgc; |
| |
| import java.rmi.dgc.DGC; |
| import java.rmi.dgc.Lease; |
| import java.rmi.dgc.VMID; |
| import java.rmi.server.ObjID; |
| import java.rmi.RemoteException; |
| import java.rmi.server.RMISocketFactory; |
| import gnu.java.rmi.server.UnicastServerRef; |
| |
| import java.util.Hashtable; |
| |
| /** |
| * I let DGCImpl to extend UnicastServerRef, but not |
| * UnicastRemoteObject, because UnicastRemoteObject must |
| * exportObject automatically. |
| */ |
| public class DGCImpl |
| extends UnicastServerRef implements DGC { |
| |
| private static final long LEASE_VALUE = 600000L; |
| // leaseCache caches a LeaseRecord associated with a vmid |
| private Hashtable leaseCache = new Hashtable(); |
| |
| public DGCImpl() throws RemoteException { |
| super(new ObjID(ObjID.DGC_ID), 0, RMISocketFactory.getSocketFactory()); |
| } |
| |
| public Lease dirty(ObjID[] ids, long sequenceNum, Lease lease) throws RemoteException { |
| VMID vmid = lease.getVMID(); |
| if (vmid == null) |
| vmid = new VMID(); |
| long leaseValue = LEASE_VALUE; |
| //long leaseValue = lease.getValue(); |
| lease = new Lease(vmid, leaseValue); |
| synchronized(leaseCache){ |
| LeaseRecord lr = (LeaseRecord)leaseCache.get(vmid); |
| if (lr != null) |
| lr.reset(leaseValue); |
| else{ |
| lr = new LeaseRecord(vmid, leaseValue); |
| leaseCache.put(vmid, lr); |
| } |
| } |
| |
| return (lease); |
| } |
| |
| public void clean(ObjID[] ids, long sequenceNum, VMID vmid, boolean strong) throws RemoteException { |
| // Not implemented |
| } |
| |
| /** |
| * LeaseRecord associates a vmid to expireTime. |
| */ |
| private static class LeaseRecord{ |
| private VMID vmid; |
| private long expireTime; |
| |
| LeaseRecord(VMID vmid, long leaseValue){ |
| this.vmid = vmid; |
| reset(leaseValue); |
| } |
| |
| // reset expireTime |
| void reset(long leaseValue){ |
| long l = System.currentTimeMillis(); |
| expireTime = l + leaseValue; |
| } |
| |
| boolean isExpired(){ |
| long l = System.currentTimeMillis(); |
| if ( l > expireTime) |
| return true; |
| return false; |
| } |
| |
| } //End of LeaseRecord |
| |
| } //End of DGCImpl |