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Java > Open Source Codes > com > caucho > db > store > SwapStore


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Scott Ferguson
28  */
29
30 package com.caucho.db.store;
31
32 import com.caucho.java.WorkDir;
33 import com.caucho.server.util.CauchoSystem;
34 import com.caucho.vfs.Path;
35
36 /**
37  * The swap store is a singleton Store to manage buffered data that might
38  * need to swap to a backing store.
39  */
40 public final class SwapStore {
41   private static SwapStore _swap;
42
43   private final Store _store;
44
45   private SwapStore()
46   {
47     ClassLoader JavaDoc loader = ClassLoader.getSystemClassLoader();
48     
49     Path workDir = WorkDir.getLocalWorkDir(loader);
50
51     String JavaDoc serverId = CauchoSystem.getServerId();
52
53     Path path = workDir.lookup("tmp-" + serverId + ".swap");
54
55     try {
56       _store = Store.create(path);
57     } catch (Exception JavaDoc e) {
58       throw new RuntimeException JavaDoc(e);
59     }
60   }
61   
62   /**
63    * Returns the swap store.
64    */
65   public static SwapStore create()
66   {
67     synchronized (SwapStore.class) {
68       if (_swap == null)
69     _swap = new SwapStore();
70
71       return _swap;
72     }
73   }
74 }
75
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