01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package com.db4o.internal.fileheader;
22:
23: import com.db4o.*;
24: import com.db4o.internal.*;
25:
26: /**
27: * @exclude
28: */
29: public abstract class TimerFileLock implements Runnable {
30:
31: public static TimerFileLock forFile(LocalObjectContainer file) {
32: if (file.needsLockFileThread()) {
33: return new TimerFileLockEnabled(
34: (IoAdaptedObjectContainer) file);
35: }
36: return new TimerFileLockDisabled();
37: }
38:
39: public abstract void checkHeaderLock();
40:
41: public abstract void checkOpenTime();
42:
43: public abstract boolean lockFile();
44:
45: public abstract long openTime();
46:
47: public abstract void setAddresses(int baseAddress,
48: int openTimeOffset, int accessTimeOffset);
49:
50: public abstract void start() throws Db4oIOException;
51:
52: public abstract void writeHeaderLock();
53:
54: public abstract void writeOpenTime();
55:
56: public abstract void close() throws Db4oIOException;
57:
58: public abstract void checkIfOtherSessionAlive(
59: LocalObjectContainer container, int address, int offset,
60: long lastAccessTime) throws Db4oIOException;
61: }
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