01: /*
02: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
03: *
04: * This file is part of Resin(R) Open Source
05: *
06: * Each copy or derived work must preserve the copyright notice and this
07: * notice unmodified.
08: *
09: * 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: ClassLoader loader = ClassLoader.getSystemClassLoader();
47:
48: Path workDir = WorkDir.getLocalWorkDir(loader);
49:
50: String serverId = CauchoSystem.getServerId();
51:
52: Path path = workDir.lookup("tmp-" + serverId + ".swap");
53:
54: try {
55: _store = Store.create(path);
56: } catch (Exception e) {
57: throw new RuntimeException(e);
58: }
59: }
60:
61: /**
62: * Returns the swap store.
63: */
64: public static SwapStore create() {
65: synchronized (SwapStore.class) {
66: if (_swap == null)
67: _swap = new SwapStore();
68:
69: return _swap;
70: }
71: }
72: }
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