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Source code: gnu/classpath/tools/rmi/Persistent.java


1   /* PersistentBidiHasthable.java -- Constants for the persistent tables.
2      Copyright (C) 2006 Free Software Foundation, Inc.
3   
4   This file is part of GNU Classpath.
5   
6   GNU Classpath is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10  
11  GNU Classpath is distributed in the hope that it will be useful, but
12  WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  General Public License for more details.
15  
16  You should have received a copy of the GNU General Public License
17  along with GNU Classpath; see the file COPYING.  If not, write to the
18  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19  02110-1301 USA.
20  
21  Linking this library statically or dynamically with other modules is
22  making a combined work based on this library.  Thus, the terms and
23  conditions of the GNU General Public License cover the whole
24  combination.
25  
26  As a special exception, the copyright holders of this library give you
27  permission to link this library with independent modules to produce an
28  executable, regardless of the license terms of these independent
29  modules, and to copy and distribute the resulting executable under
30  terms of your choice, provided that you also meet, for each linked
31  independent module, the terms and conditions of the license of that
32  module.  An independent module is a module which is not derived from
33  or based on this library.  If you modify this library, you may extend
34  this exception to your version of the library, but you are not
35  obligated to do so.  If you do not wish to do so, delete this
36  exception statement from your version. */
37  
38  package gnu.classpath.tools.rmi;
39  
40  import java.util.Timer;
41  import java.util.TimerTask;
42  
43  /**
44   * The static fields, shared by the multiple classes, implementing the
45   * persistent work.
46   * 
47   * @author Audrius Meskauskas (audriusa@bioinformatics.org)
48   */
49  public interface Persistent
50  {
51    /**
52     * Sheduled termination task.
53     */
54    static class ExitTask extends TimerTask
55    {
56      public void run()
57      {
58        System.exit(0);
59      }
60    }
61    
62    /**
63     * The timer, sheduling all disk database update events, shared by all
64     * instances.
65     */
66    static Timer timer = new Timer(true);
67  
68    /**
69     * The longest time, in ms, after that the database content on the disk must
70     * be updated. The algorithm is written to avoid the very frequent writings to
71     * the disk.
72     */
73    static long SAVE_AT_MOST_AFTER = 5000;
74  
75    /**
76     * States how long the database may stay not updated during the intensive
77     * operations, in ms. Otherwise the intensively used structure may never
78     * be stored to the disk.
79     */
80    static long ALWAYS_UPDATE = 300000;
81    
82    /**
83     * Write the database content to the disk.
84     */
85    void writeContent();  
86    
87  }