1 /* Open Source Java Caching Service
2 * Copyright (C) 2002 Frank Karlstrøm
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public
5 * License as published by the Free Software Foundation; either
6 * version 2.1 of the License, or (at your option) any later version.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 *
17 * The author can be contacted by email: fjankk@users.sourceforge.net
18 */
19 package org.fjank.jcache.persistence;
20
21 import java.io.Serializable;
22
23
24 /**
25 * Disk objects are located by descriptor entries. These are saved on shutdown
26 * and loaded into memory on startup.
27 */
28 class DiskElementDescriptor implements Serializable {
29 /** the position where the object starts */
30 long pos;
31
32 /** the length of the object */
33 int len;
34
35 /**
36 * Creates a new DiskElementDescriptor object.
37 */
38 DiskElementDescriptor() {
39 }
40
41 /**
42 * initializes this descriptor with the position to start at, and a byte[]
43 * with the actual data which is to be written.
44 *
45 * @param pos2 the starting position
46 * @param data the data to write.
47 */
48 void init(final long pos2, final byte[] data) {
49 this.pos = pos2;
50 this.len = data.length;
51 }
52 }