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Java > Open Source Codes > org > opensubsystems > core > util > GlobalSequence


1 /*
2  * Copyright (c) 2003 - 2007 OpenSubsystems s.r.o. Slovak Republic. All rights reserved.
3  *
4  * Project: OpenSubsystems
5  *
6  * $Id: GlobalSequence.java,v 1.3 2007/01/07 06:14:01 bastafidli Exp $
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; version 2 of the License.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21
22 package org.opensubsystems.core.util;
23
24 /**
25  * Base class for getting of unique sequence numbers.
26  *
27  * @version $Id: GlobalSequence.java,v 1.3 2007/01/07 06:14:01 bastafidli Exp $
28  * @author Julo Legeny
29  * @code.reviewer Miro Halas
30  * @code.reviewed Initial revision
31  */
32 public final class GlobalSequence
33 {
34    // Attributes ///////////////////////////////////////////////////////////////
35
36    /**
37     * Last request ID
38     */
39    private static int s_lastRequest = 0;
40    
41    // Constructors /////////////////////////////////////////////////////////////
42
43    /**
44     * Private constructor since this class cannot be instantiated
45     */
46    private GlobalSequence(
47    )
48    {
49       // Do nothing
50 // Since this cannot be never invoked, this is here just to avoid Checkstyle
51 // warning.
52 s_lastRequest = 0;
53    }
54
55    // Public methods ///////////////////////////////////////////////////////////
56
57    /**
58     * Get new sequence number which is guaranteed to be unique in this class loader.
59     *
60     * @return int
61     */
62    public static synchronized int getNextSequenceNumber(
63    )
64    {
65       return s_lastRequest++;
66    }
67 }
68
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