View Javadoc

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  }