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Java > Open Source Codes > org > jboss > cache > optimistic > DataVersion


1 /*
2  * JBoss, Home of Professional Open Source
3  *
4  * Distributable under LGPL license.
5  * See terms of license at gnu.org.
6  */
7 package org.jboss.cache.optimistic;
8
9 import java.io.Serializable JavaDoc;
10
11 /**
12  * When versioning data nodes in optimistic locking, a DataVersion is assigned
13  * to each node. Versions need to implement the {@link #newerThan} method so
14  * they can be compared during the validation phase upon commit.
15  * <p/>
16  * It is recommended that implementations implement {@link java.io.Externalizable} and make use
17  * of a good marshalling/unmarshalling mechanism for the sake of efficiency, as these objects are
18  * frequently serialized to be replicated across the wire.
19  *
20  * @author <a HREF="mailto:manik@jboss.org">Manik Surtani (manik@jboss.org)</a>
21  */
22 public interface DataVersion extends Serializable JavaDoc
23 {
24    /**
25     * Returns true if this is a newer version than <code>other</code>.
26     */
27    public boolean newerThan(DataVersion other);
28 }
29
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