KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > db4o > header > TimerFileLock


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 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.header;
22
23 import java.io.*;
24
25 import com.db4o.*;
26
27
28 /**
29  * @exclude
30  */
31 public abstract class TimerFileLock implements Runnable JavaDoc{
32     
33     public static TimerFileLock forFile(YapFile file){
34         if(lockFile(file)){
35             return new TimerFileLockEnabled(file);
36         }
37         return new TimerFileLockDisabled();
38     }
39     
40     private static boolean lockFile(YapFile file){
41         if(! Debug.lockFile){
42             return false;
43         }
44         return file.needsLockFileThread();
45     }
46
47     public abstract void checkHeaderLock();
48
49     public abstract void checkOpenTime();
50
51     public abstract boolean lockFile();
52
53     public abstract long openTime();
54
55     public abstract void setAddresses(int baseAddress, int openTimeOffset, int accessTimeOffset);
56
57     public abstract void start() throws IOException;
58
59     public abstract void writeHeaderLock();
60
61     public abstract void writeOpenTime();
62
63     public abstract void close() throws IOException;
64
65 }
66
Popular Tags