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# qfuturesynchronizer.h

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    00001 /****************************************************************************
    00002 **
    00003 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
    00004 ** All rights reserved.
    00005 ** Contact: Nokia Corporation (qt-info@nokia.com)
    00006 **
    00007 ** This file is part of the QtCore module of the Qt Toolkit.
    00008 **
    00009 ** $QT_BEGIN_LICENSE:LGPL$
    00010 ** Commercial Usage
    00011 ** Licensees holding valid Qt Commercial licenses may use this file in
    00012 ** accordance with the Qt Commercial License Agreement provided with the
    00013 ** Software or, alternatively, in accordance with the terms contained in
    00014 ** a written agreement between you and Nokia.
    00015 **
    00016 ** GNU Lesser General Public License Usage
    00017 ** Alternatively, this file may be used under the terms of the GNU Lesser
    00018 ** General Public License version 2.1 as published by the Free Software
    00019 ** Foundation and appearing in the file LICENSE.LGPL included in the
    00020 ** packaging of this file.  Please review the following information to
    00021 ** ensure the GNU Lesser General Public License version 2.1 requirements
    00022 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    00023 **
    00024 ** In addition, as a special exception, Nokia gives you certain additional
    00025 ** rights.  These rights are described in the Nokia Qt LGPL Exception
    00026 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this module.
    00027 **
    00028 ** GNU General Public License Usage
    00029 ** Alternatively, this file may be used under the terms of the GNU
    00030 ** General Public License version 3.0 as published by the Free Software
    00031 ** Foundation and appearing in the file LICENSE.GPL included in the
    00032 ** packaging of this file.  Please review the following information to
    00033 ** ensure the GNU General Public License version 3.0 requirements will be
    00034 ** met: http://www.gnu.org/copyleft/gpl.html.
    00035 **
    00036 ** If you have questions regarding the use of this file, please contact
    00037 ** Nokia at qt-info@nokia.com.
    00038 ** $QT_END_LICENSE$
    00039 **
    00040 ****************************************************************************/
    00041
    00042 #ifndef QFUTRUESYNCHRONIZER_H
    00043 #define QFUTRUESYNCHRONIZER_H
    00044
    00045 #include <QtCore/qfuture.h>
    00046
    00047 #ifndef QT_NO_CONCURRENT
    00048
    00049 QT_BEGIN_HEADER
    00050 QT_BEGIN_NAMESPACE
    00051
    00052 QT_MODULE(Core)
    00053
    00054 template <typename T>
    00055 class QFutureSynchronizer
    00056 {
    00057     Q_DISABLE_COPY(QFutureSynchronizer)
    00058
    00059 public:
    00060     QFutureSynchronizer() : m_cancelOnWait(false) { }
    00061     explicit QFutureSynchronizer(const QFuture<T> &future)
    00062         : m_cancelOnWait(false)
    00063     { addFuture(future); }
    00064     ~QFutureSynchronizer()  { waitForFinished(); }
    00065
    00066     void setFuture(const QFuture<T> &future)
    00067     {
    00068         waitForFinished();
    00069         m_futures.clear();
    00070         addFuture(future);
    00071     }
    00072
    00073     void addFuture(const QFuture<T> &future)
    00074     {
    00075         m_futures.append(future);
    00076     }
    00077
    00078     void waitForFinished()
    00079     {
    00080         if (m_cancelOnWait) {
    00081             for (int i = 0; i < m_futures.count(); ++i) {
    00082                  m_futures[i].cancel();
    00083             }
    00084         }
    00085
    00086         for (int i = 0; i < m_futures.count(); ++i) {
    00087              m_futures[i].waitForFinished();
    00088          }
    00089     }
    00090
    00091     void clearFutures()
    00092     {
    00093         m_futures.clear();
    00094     }
    00095
    00096     QList<QFuture<T> > futures() const
    00097     {
    00098         return m_futures;
    00099     }
    00100
    00101     void setCancelOnWait(bool enabled)
    00102     {
    00103         m_cancelOnWait = enabled;
    00104     }
    00105
    00106     bool cancelOnWait() const
    00107     {
    00108         return m_cancelOnWait;
    00109     }
    00110
    00111 protected:
    00112     QList<QFuture<T> > m_futures;
    00113     bool m_cancelOnWait;
    00114 };
    00115
    00116 QT_END_NAMESPACE
    00117 QT_END_HEADER
    00118
    00119 #endif // QT_NO_CONCURRENT
    00120
    00121 #endif // QFUTRUESYNCHRONIZER_H