113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// MuldeR's Utilities for Qt
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// Copyright (C) 2004-2014 LoRd_MuldeR <MuldeR2@GMX.de>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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//
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// http://www.gnu.org/licenses/lgpl-2.1.txt
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//////////////////////////////////////////////////////////////////////////////////
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#pragma once
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//MUtils
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#include <MUtils/Global.h>
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//StdLib
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#include <stdexcept>
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//Qt
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#include <QString>
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#include <QFile>
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///////////////////////////////////////////////////////////////////////////////
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// Directory Locker
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///////////////////////////////////////////////////////////////////////////////
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namespace MUtils
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{
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namespace Internal
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{
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class DirLockException : public std::runtime_error
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{
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public:
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DirLockException(const char *const message)
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:
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std::runtime_error(message)
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{
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}
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};
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class DirLock
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{
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public:
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DirLock(const QString dirPath)
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:
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m_dirPath(dirPath)
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{
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if(m_dirPath.isEmpty())
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{
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throw DirLockException("Path must not be empty!");
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}
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const QByteArray testData = QByteArray(TEST_DATA);
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bool okay = false;
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for(int i = 0; i < 32; i++)
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{
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m_lockFile.reset(new QFile(QString("%1/~%2.lck").arg(m_dirPath, MUtils::rand_str())));
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if(m_lockFile->open(QIODevice::WriteOnly | QIODevice::Truncate))
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{
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if(m_lockFile->write(testData) >= testData.size())
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{
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okay = true;
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break;
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}
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m_lockFile->remove();
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}
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}
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if(!okay)
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{
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throw DirLockException("Locking has failed!");
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}
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}
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~DirLock(void)
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{
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if(!m_lockFile.isNull())
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{
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m_lockFile->remove();
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}
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for(int i = 0; i < 8; i++)
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{
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if(MUtils::remove_directory(m_dirPath))
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{
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break;
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}
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}
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}
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inline const QString &path(void) const
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{
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return m_dirPath;
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}
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private:
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static const char *const TEST_DATA;
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const QString m_dirPath;
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QScopedPointer<QFile> m_lockFile;
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};
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const char *const DirLock::TEST_DATA = "7QtDxPWotHGQYv1xHyQHFKjTB5u5VYKHE20NMDAgLRYoy16CZN7mEYijbjCJpORnoBbtHCzqyy1a6BLCMMiTUZpLzgjg4qnN505egUBqk3wMhPsYjFpkng9i37mWd1iF";
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}
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}
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