/****************************************************************************
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** Foundation and appearing in the file LICENSE.LGPL included in the
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****************************************************************************/

#ifndef QFUTRUESYNCHRONIZER_H
#define QFUTRUESYNCHRONIZER_H

#include <QtCore/qfuture.h>

#ifndef QT_NO_CONCURRENT

QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE

QT_MODULE(Core)

template <typename T>
class QFutureSynchronizer
{
    Q_DISABLE_COPY(QFutureSynchronizer)

public:
    QFutureSynchronizer() : m_cancelOnWait(false) { }
    explicit QFutureSynchronizer(const QFuture<T> &future)
        : m_cancelOnWait(false)
    { addFuture(future); }
    ~QFutureSynchronizer()  { waitForFinished(); }

    void setFuture(const QFuture<T> &future)
    {
        waitForFinished();
        m_futures.clear();
        addFuture(future);
    }

    void addFuture(const QFuture<T> &future)
    {
        m_futures.append(future);
    }

    void waitForFinished()
    {
        if (m_cancelOnWait) {
            for (int i = 0; i < m_futures.count(); ++i) {
                 m_futures[i].cancel();
            }
        }
        
        for (int i = 0; i < m_futures.count(); ++i) {
             m_futures[i].waitForFinished();
         }
    }

    void clearFutures()
    {
        m_futures.clear();
    }

    QList<QFuture<T> > futures() const
    {
        return m_futures;
    }

    void setCancelOnWait(bool enabled)
    {
        m_cancelOnWait = enabled;
    }

    bool cancelOnWait() const
    {
        return m_cancelOnWait;
    }

protected:
    QList<QFuture<T> > m_futures;
    bool m_cancelOnWait;
};

QT_END_NAMESPACE
QT_END_HEADER

#endif // QT_NO_CONCURRENT

#endif // QFUTRUESYNCHRONIZER_H
