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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
package convwatch;
import java.io.File;
import java.io.RandomAccessFile;
import helper.OSHelper;
public class SimpleFileSemaphore /* extends *//* implements */
{
String m_sInternSemaphoreFile;
File m_aInternSemaphoreFile;
GlobalLogWriter m_aLog;
public static void sleep( int _nSeconds)
{
// wait a second here
try
{
java.lang.Thread.sleep(_nSeconds * 1000);
}
catch (java.lang.InterruptedException e2)
{
}
}
public SimpleFileSemaphore() throws IllegalArgumentException
{
String sInternFileName;
if (OSHelper.isWindows())
{
sInternFileName = "C:/Temp/ConvwatchOOoSemaphore.txt";
}
else if (OSHelper.isUnix())
{
sInternFileName = "/tmp/ConvwatchOOoSemaphore.txt";
}
else
{
m_sInternSemaphoreFile = null;
throw new IllegalArgumentException("Unknown System, can't initialise SimpleFileSemaphore");
}
m_sInternSemaphoreFile = sInternFileName;
m_aInternSemaphoreFile = new File(sInternFileName);
}
public File getSemaphoreFile()
{
return m_aInternSemaphoreFile;
}
// ------------------------------------------------------------------------------
// wait until resource is available
public void P(File _aSemaphore)
{
int nCount = 0;
int nCheckLoop = 1;
while ( nCheckLoop == 1)
{
// check if resource is available, if not, wait.
if ( _aSemaphore.exists() )
{
m_aLog.get().println( "Active wait since " + nCount + "sec..");
nCount ++;
sleep( 1 );
}
else
{
sleep( 1 );
if ( _aSemaphore.exists() )
{
// ups
m_aLog.get().println( "ups...");
}
else
{
nCheckLoop = 0;
}
}
}
// block resource by ourself
try
{
RandomAccessFile aWriter = new RandomAccessFile(_aSemaphore, "rw");
aWriter.writeByte((int)1);
aWriter.close();
}
catch (java.io.FileNotFoundException fne)
{
m_aLog.get().println( "caught: FileNotFoundException");
}
catch(java.io.IOException ie)
{
m_aLog.get().println( "caught: IOException");
}
}
// ------------------------------------------------------------------------------
// block a resource
public void V(File _aSemaphore)
{
if ( _aSemaphore.exists() )
{
_aSemaphore.delete();
}
else
{
m_aLog.get().println("Could be a problem here? No resource block found.");
}
}
// --------------------------------- Unit test ---------------------------------
private static boolean SEMAPHORE_SHOULD_EXIST = true;
private static boolean SEMAPHORE_SHOULD_NOT_EXIST = false;
private static void assure(boolean _b, String _sText)
{
System.out.print(_sText);
System.out.print(" ");
if (_b)
{
System.out.println("ok");
}
else
{
System.out.println("FAILED");
}
}
private static void testSemaphoreFile(SimpleFileSemaphore a, boolean _bShouldFileExists)
{
System.out.println("Check if semaphore file exists.");
File aSemaphoreFile = a.getSemaphoreFile();
if (aSemaphoreFile.exists())
{
System.out.println("Name is: " + aSemaphoreFile.getAbsolutePath());
assure(_bShouldFileExists == SEMAPHORE_SHOULD_EXIST, "Semaphore should exist!");
}
else
{
assure(_bShouldFileExists == SEMAPHORE_SHOULD_NOT_EXIST, "Semaphore should not exist!");
}
}
public static void main( String[] argv )
{
SimpleFileSemaphore a = new SimpleFileSemaphore();
testSemaphoreFile(a, SEMAPHORE_SHOULD_NOT_EXIST);
a.P(a.getSemaphoreFile());
testSemaphoreFile(a, SEMAPHORE_SHOULD_EXIST);
a.V(a.getSemaphoreFile());
testSemaphoreFile(a, SEMAPHORE_SHOULD_NOT_EXIST);
}
}
|
