Some clean-up and simplification for JobObject class.
[MUtilities.git] / src / DirLocker.h
blobe7f4248d0d676bb96e7eaf7edc7d1d13e2fbc420
1 ///////////////////////////////////////////////////////////////////////////////
2 // MuldeR's Utilities for Qt
3 // Copyright (C) 2004-2016 LoRd_MuldeR <MuldeR2@GMX.de>
4 //
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Lesser General Public
7 // License as published by the Free Software Foundation; either
8 // version 2.1 of the License, or (at your option) any later version.
9 //
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Lesser General Public License for more details.
15 // You should have received a copy of the GNU Lesser General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 // http://www.gnu.org/licenses/lgpl-2.1.txt
20 //////////////////////////////////////////////////////////////////////////////////
22 #pragma once
24 //MUtils
25 #include <MUtils/Global.h>
27 //StdLib
28 #include <stdexcept>
30 //Qt
31 #include <QString>
32 #include <QFile>
34 ///////////////////////////////////////////////////////////////////////////////
35 // Directory Locker
36 ///////////////////////////////////////////////////////////////////////////////
38 namespace MUtils
40 namespace Internal
42 class DirLockException : public std::runtime_error
44 public:
45 DirLockException(const char *const message)
47 std::runtime_error(message)
52 class DirLock
54 public:
55 DirLock(const QString dirPath)
57 m_dirPath(dirPath)
59 bool okay = false;
60 const QByteArray testData = QByteArray(TEST_DATA);
61 if(m_dirPath.isEmpty())
63 throw DirLockException("Path must not be empty!");
65 for(int i = 0; i < 32; i++)
67 m_lockFile.reset(new QFile(QString("%1/~%2.lck").arg(m_dirPath, MUtils::next_rand_str())));
68 if(m_lockFile->open(QIODevice::WriteOnly | QIODevice::Truncate | QIODevice::Unbuffered))
70 if(m_lockFile->write(testData) >= testData.size())
72 if(m_lockFile->error() == QFile::NoError)
74 okay = true;
75 break;
78 m_lockFile->remove();
81 if(!okay)
83 throw DirLockException("Locking has failed!");
87 ~DirLock(void)
89 bool okay = false;
90 if(!m_lockFile.isNull())
92 for(int i = 0; i < 16; i++)
94 if(m_lockFile->remove() || (!m_lockFile->exists()))
96 okay = true;
97 break;
99 OS::sleep_ms(125);
102 if(!okay)
104 qWarning("DirLock: The lock file could not be removed!");
108 inline const QString &getPath(void) const
110 return m_dirPath;
113 private:
114 static const char *const TEST_DATA;
115 const QString m_dirPath;
116 QScopedPointer<QFile> m_lockFile;
119 const char *const DirLock::TEST_DATA = "7QtDxPWotHGQYv1xHyQHFKjTB5u5VYKHE20NMDAgLRYoy16CZN7mEYijbjCJpORnoBbtHCzqyy1a6BLCMMiTUZpLzgjg4qnN505egUBqk3wMhPsYjFpkng9i37mWd1iF";