1 /*
2 * Copyright 2004 Charles Blaxland
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package mnemosyne.archiver;
17
18
19
20 /***
21 * @version $Id: ArchiveSequence.java,v 1.1.1.1 2004/08/07 06:40:51 charlesblaxland Exp $
22 */
23 public class ArchiveSequence
24 {
25 private long sequenceNumber;
26
27 public ArchiveSequence()
28 {
29 sequenceNumber = 0;
30 }
31
32 public ArchiveSequence(long sequenceNumber)
33 {
34 this.sequenceNumber = sequenceNumber;
35 }
36
37 public synchronized long getNext()
38 {
39 return sequenceNumber++;
40 }
41
42 public synchronized void advanceValue(long value)
43 {
44 if (value > sequenceNumber)
45 {
46 sequenceNumber = value;
47 }
48 }
49 }