blob: a648a2bba8f2108f1b32da5945238c7f1a7c0d5e (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/*
* Copyright (c) 2015 Eike Stepper (Loehne, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v20.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.oomph.util;
import org.eclipse.oomph.internal.util.UtilPlugin;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileLock;
/**
* @author Eike Stepper
*/
public final class LockFile
{
private final File file;
private FileOutputStream stream;
private FileLock lock;
public LockFile(File file)
{
this.file = file;
}
public File getFile()
{
return file;
}
public synchronized boolean isLocked()
{
return stream != null;
}
public synchronized void lock() throws IOException
{
if (stream == null)
{
try
{
stream = new FileOutputStream(file);
lock = stream.getChannel().tryLock();
if (lock == null)
{
throw new IOException(file + " could not be locked");
}
}
catch (IOException ex)
{
doRelease();
throw ex;
}
catch (RuntimeException ex)
{
doRelease();
throw ex;
}
catch (Error ex)
{
doRelease();
throw ex;
}
}
}
public synchronized void unlock()
{
if (stream != null)
{
doRelease();
}
}
private void doRelease()
{
if (lock != null)
{
try
{
lock.release();
}
catch (Throwable ex)
{
UtilPlugin.INSTANCE.log(ex);
}
finally
{
lock = null;
}
}
if (stream != null)
{
try
{
IOUtil.close(stream);
}
catch (Throwable ex)
{
UtilPlugin.INSTANCE.log(ex);
}
finally
{
stream = null;
}
}
try
{
file.delete();
}
catch (Throwable ex)
{
// Ignore
}
}
}
|
