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jlechner |
/* DGCImpl.java --
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Copyright (c) 1996, 1997, 1998, 1999, 2002, 2005
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Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.rmi.dgc;
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import gnu.java.rmi.server.UnicastServerRef;
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import java.rmi.RemoteException;
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import java.rmi.dgc.DGC;
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import java.rmi.dgc.Lease;
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import java.rmi.dgc.VMID;
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import java.rmi.server.ObjID;
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import java.rmi.server.RMISocketFactory;
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import java.util.Hashtable;
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/**
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* I let DGCImpl to extend UnicastServerRef, but not
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* UnicastRemoteObject, because UnicastRemoteObject must
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* exportObject automatically.
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*/
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public class DGCImpl
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extends UnicastServerRef implements DGC {
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private static final long LEASE_VALUE = 600000L;
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// leaseCache caches a LeaseRecord associated with a vmid
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private Hashtable leaseCache = new Hashtable();
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public DGCImpl() throws RemoteException {
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super(new ObjID(ObjID.DGC_ID), 0, RMISocketFactory.getSocketFactory());
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}
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public Lease dirty(ObjID[] ids, long sequenceNum, Lease lease) throws RemoteException {
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VMID vmid = lease.getVMID();
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if (vmid == null)
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vmid = new VMID();
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long leaseValue = LEASE_VALUE;
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//long leaseValue = lease.getValue();
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lease = new Lease(vmid, leaseValue);
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synchronized(leaseCache){
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LeaseRecord lr = (LeaseRecord)leaseCache.get(vmid);
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if (lr != null)
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lr.reset(leaseValue);
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else{
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lr = new LeaseRecord(vmid, leaseValue);
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leaseCache.put(vmid, lr);
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}
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}
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return (lease);
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}
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public void clean(ObjID[] ids, long sequenceNum, VMID vmid, boolean strong) throws RemoteException {
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// Not implemented
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}
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/**
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* LeaseRecord associates a vmid to expireTime.
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*/
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private static class LeaseRecord{
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private VMID vmid;
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private long expireTime;
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LeaseRecord(VMID vmid, long leaseValue){
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this.vmid = vmid;
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reset(leaseValue);
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}
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// reset expireTime
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void reset(long leaseValue){
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long l = System.currentTimeMillis();
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expireTime = l + leaseValue;
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}
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boolean isExpired(){
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long l = System.currentTimeMillis();
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if ( l > expireTime)
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return true;
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return false;
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}
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} //End of LeaseRecord
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} //End of DGCImpl
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