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DataVersion.java | - | - | - | - |
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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; | |
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 | |
23 | { | |
24 | /** | |
25 | * Returns true if this is a newer version than <code>other</code>. There is no guarantee that the DataVersion passed | |
26 | * in is of the same implementation as the current instance. The implementation will have to check for this (if necessary) | |
27 | * and (if necessary) throw a {@link org.jboss.cache.optimistic.DataVersioningException}. | |
28 | */ | |
29 | public boolean newerThan(DataVersion other); | |
30 | } |
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