KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > internetcds > jdbc > tds > UniqueId


1 //
2 // Copyright 1998 CDS Networks, Inc., Medford Oregon
3 //
4 // All rights reserved.
5 //
6 // Redistribution and use in source and binary forms, with or without
7 // modification, are permitted provided that the following conditions are met:
8 // 1. Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // 2. Redistributions in binary form must reproduce the above copyright
11 // notice, this list of conditions and the following disclaimer in the
12 // documentation and/or other materials provided with the distribution.
13 // 3. All advertising materials mentioning features or use of this software
14 // must display the following acknowledgement:
15 // This product includes software developed by CDS Networks, Inc.
16 // 4. The name of CDS Networks, Inc. may not be used to endorse or promote
17 // products derived from this software without specific prior
18 // written permission.
19 //
20 // THIS SOFTWARE IS PROVIDED BY CDS NETWORKS, INC. ``AS IS'' AND
21 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 // ARE DISCLAIMED. IN NO EVENT SHALL CDS NETWORKS, INC. BE LIABLE
24 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 // OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 // HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 // SUCH DAMAGE.
31 //
32
33
34 package com.internetcds.jdbc.tds;
35
36
37 /**
38  * return a monotonically increasing number.
39  *
40  * This class provides a thread safe way of generating unique
41  * numbers. It is used in the TDS driver to help generate unique
42  * names for temporary stored procedures and temporary tables.
43  *
44  * @author Craig Spannring
45  * @version $Id: UniqueId.java,v 1.1 2006/06/23 10:39:30 sinisa Exp $
46  */
47 public class UniqueId {
48    public static final String JavaDoc cvsVersion = "$Id: UniqueId.java,v 1.1 2006/06/23 10:39:30 sinisa Exp $";
49
50    // next number to return from the getUniqueId() method
51 private static long id = 1;
52
53
54    /**
55     * return a unique number.
56     * <p>
57     * The number is unique for a given invocation of the JVM. Currently
58     * the number is monotonically increasing, but I make no guarantees
59     * that it will be that way in future releases.
60     *
61     * @return unique number
62     */
63    public static synchronized long getUniqueId()
64    {
65       return id++;
66    }
67 }
68
Popular Tags