/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
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** This file is part of the Qt Solutions component.
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** $QT_BEGIN_LICENSE:BSD$
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**
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** modification, are permitted provided that the following conditions are
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**     notice, this list of conditions and the following disclaimer.
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**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
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****************************************************************************/

#ifndef QTLOCKEDFILE_H
#define QTLOCKEDFILE_H

#include <QFile>

/**
 * @brief kabase模块应用通用函数
 * @since 1.2.0
 */

#ifdef Q_OS_WIN
#include <QVector>
#endif

#if defined(Q_OS_WIN)
#if !defined(QT_QTLOCKEDFILE_EXPORT) && !defined(QT_QTLOCKEDFILE_IMPORT)
#define QT_QTLOCKEDFILE_EXPORT
#elif defined(QT_QTLOCKEDFILE_IMPORT)
#if defined(QT_QTLOCKEDFILE_EXPORT)
#undef QT_QTLOCKEDFILE_EXPORT
#endif
#define QT_QTLOCKEDFILE_EXPORT __declspec(dllimport)
#elif defined(QT_QTLOCKEDFILE_EXPORT)
#undef QT_QTLOCKEDFILE_EXPORT
#define QT_QTLOCKEDFILE_EXPORT __declspec(dllexport)
#endif
#else
#define QT_QTLOCKEDFILE_EXPORT
#endif

namespace kdk
{
namespace kabase
{
namespace QtLP_Private
{

class QT_QTLOCKEDFILE_EXPORT QtLockedFile : public QFile
{
public:
    enum LockMode { NoLock = 0,
                    ReadLock,
                    WriteLock };

    QtLockedFile();
    QtLockedFile(const QString &name);
    ~QtLockedFile();

    bool open(OpenMode mode);

    bool lock(LockMode mode, bool block = true);
    bool unlock();
    bool isLocked() const;
    LockMode lockMode() const;

private:
#ifdef Q_OS_WIN
    Qt::HANDLE wmutex;
    Qt::HANDLE rmutex;
    QVector<Qt::HANDLE> rmutexes;
    QString mutexname;

    Qt::HANDLE getMutexHandle(int idx, bool doCreate);
    bool waitMutex(Qt::HANDLE mutex, bool doBlock);

#endif
    LockMode m_lock_mode;
};

} // namespace QtLP_Private
} // namespace kabase
} // namespace kdk
#endif
