~george-edison55/twistload/trunk

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 Nathan Osman
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef ALLOCATIONTASK_H
#define ALLOCATIONTASK_H

#include <QMutex>
#include <QObject>

/**
 * @brief Task for allocating space in a file
 *
 * This task is designed to be run in a separate thread. Although QFile
 * provides a resize() method, it isn't asynchronous, hence the need for this
 * class.
 */
class AllocationTask : public QObject
{
    Q_OBJECT

public:

    explicit AllocationTask(const QString &filename, qint64 size);

    void abort();

Q_SIGNALS:

    void progress(int value);
    void error(const QString &message);
    void succeeded();
    void finished();

public Q_SLOTS:

    void run();

private:

    QString mFilename;
    qint64 mSize;

    QMutex mMutex;
    bool mAbort;
};

#endif // ALLOCATIONTASK_H