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Diffstat (limited to 'libjava/classpath/gnu/java/rmi/dgc/DGCImpl.java')
| -rw-r--r-- | libjava/classpath/gnu/java/rmi/dgc/DGCImpl.java | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/libjava/classpath/gnu/java/rmi/dgc/DGCImpl.java b/libjava/classpath/gnu/java/rmi/dgc/DGCImpl.java deleted file mode 100644 index 5efbf279636..00000000000 --- a/libjava/classpath/gnu/java/rmi/dgc/DGCImpl.java +++ /dev/null @@ -1,182 +0,0 @@ -/* DGCImpl.java -- - Copyright (c) 1996, 1997, 1998, 1999, 2002, 2005 - 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., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 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 gnu.java.rmi.server.UnicastServer; -import gnu.java.rmi.server.UnicastServerRef; - -import java.rmi.RemoteException; -import java.rmi.dgc.DGC; -import java.rmi.dgc.Lease; -import java.rmi.dgc.VMID; -import java.rmi.server.ObjID; -import java.rmi.server.RMISocketFactory; -import java.util.Collection; -import java.util.TimerTask; - -/** - * The DGC implementation is used for the server side during the distributed - * garbage collection. This interface contains the two methods: dirty and clean. - * A dirty call is made when a remote reference is unmarshaled in a client. A - * corresponding clean call is made by client it no longer uses that remote - * reference. A reference to a remote object is also automatically released - * after so called lease period that starts after the dirty call is received. It - * is the client's responsibility to renew the leases, by making additional - * dirty calls before such leases expire. - */ -public class DGCImpl - extends UnicastServerRef - implements DGC -{ - /* - * The DGCImpl extends UnicastServerRef and not UnicastRemoteObject, because - * UnicastRemoteObject must exportObject automatically. - */ - - /** - * Use the serial version UID for interoperability. - */ - private static final long serialVersionUID = 1; - - /** - * Protects the array of object Id's for the scheduled period of time - * (lease). After the time expires, the protector is automatically discarded, - * making the references unprotected and hence applicable for the garbage - * collection. - */ - class RefProtector extends TimerTask - { - /** - * The corresponding server references to protect. Each Id may contain - * multiple references that are stored to collection. - */ - Collection[] references; - - /** - * Create the new instance of the reference protector that protects the - * given array of ids and exists for the given period of time. - * - * @param ids the ids to protect. - */ - RefProtector(ObjID[] ids, long timeToLive) - { - references = new Collection[ids.length]; - for (int i = 0; i < ids.length; i++) - { - references[i] = UnicastServer.getExported(ids[i]); - } - - // Schedule the existence. - LeaseRenewingTask.timer.schedule(this, timeToLive); - } - - /** - * Break all links, ensuring easy collection of the references by the gc. - */ - public void run() - { - for (int i = 0; i < references.length; i++) - { - references[i].clear(); - references[i] = null; - } - } - } - - /** - * This defauld lease value is used if the lease value, passed to the - * {@link #dirty} is equal to zero. - */ - static final long LEASE_VALUE = 600000L; - - /** - * Create the new DGC implementation. - * - * @throws RemoteException if the super constructor throws or the - * socket factory fails. - */ - public DGCImpl() throws RemoteException - { - super(new ObjID(ObjID.DGC_ID), 0, RMISocketFactory.getSocketFactory()); - } - - /** - * Mark the given objects referecnes as used on the client side. - * - * @param ids the ids of the used objects. - * @param sequenceNum the number of the call (used to detect and discard late - * calls). - * @param lease the requested lease - * @return the granted lease - */ - public Lease dirty(ObjID[] ids, long sequenceNum, Lease lease) - throws RemoteException - { - // We do not fill in VMID because in this implementation it is not used. - long leaseValue = lease.getValue(); - - // Grant the maximal default lease time if the passed value is zero. - if (leaseValue <= 0) - leaseValue = LEASE_VALUE; - - // Create (and shedule of the given existence) the new reference - // protector. - new RefProtector(ids, leaseValue); - - lease = new Lease(lease.getVMID(), leaseValue); - return lease; - } - - /** - * Mark the given objects as no longer used on the client side. - * - * @param ids the ids of the objects that are no longer used. - * @param sequenceNum the number of the call (used to detect and discard late - * calls) - * @param vmid the VMID of the client. - * @param strong make the "strong" clean call. - */ - public void clean(ObjID[] ids, long sequenceNum, VMID vmid, boolean strong) - throws RemoteException - { - // Not implemented - // TODO implement - } - -} // End of DGCImpl |