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/****************************************************************************
**
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** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing
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**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company.  For licensing terms and
** conditions see http://www.qt.io/terms-conditions.  For further information
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** use the contact form at http://www.qt.io/contact-us.
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**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, The Qt Company gives you certain additional
** rights.  These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/

#ifndef STRINGTABLE_H
#define STRINGTABLE_H

#include <QAtomicInt>
#include <QMutex>
#include <QObject>
#include <QRunnable>
#include <QSet>
#include <QTimer>

namespace CppTools {
namespace Internal {

class StringTable: public QObject
{
    Q_OBJECT

public:
    StringTable();

    QString insert(const QString &string);
    void scheduleGC();

private slots:
    void startGC();

private:
    void GC();
    class GCRunner: public QRunnable {
        StringTable &m_stringTable;

    public:
        GCRunner(StringTable &stringTable): m_stringTable(stringTable) {}
        virtual void run() { m_stringTable.GC(); }
    } m_gcRunner;
    friend class GCRunner;

private:
    mutable QMutex m_lock;
    QAtomicInt m_stopGCRequested;
    QSet<QString> m_strings;
    QTimer m_gcCountDown;
};

} // Internal namespace
} // CppTools namespace

#endif // STRINGTABLE_H