dataexchange.cpp

/********************************************************************************
 *  FARSA Utilities Library                                                     *
 *  Copyright (C) 2007-2012                                                     *
 *  Gianluca Massera <emmegian@yahoo.it>                                        *
 *  Stefano Nolfi <stefano.nolfi@istc.cnr.it>                                   *
 *  Tomassino Ferrauto <tomassino.ferrauto@istc.cnr.it>                         *
 *                                                                              *
 *  This program is free software; you can redistribute it and/or modify        *
 *  it under the terms of the GNU General Public License as published by        *
 *  the Free Software Foundation; either version 2 of the License, or           *
 *  (at your option) any later version.                                         *
 *                                                                              *
 *  This program is distributed in the hope that it will be useful,             *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of              *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               *
 *  GNU General Public License for more details.                                *
 *                                                                              *
 *  You should have received a copy of the GNU General Public License           *
 *  along with this program; if not, write to the Free Software                 *
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA  *
 ********************************************************************************/

#include "dataexchange.h"

namespace farsa {

    void GlobalUploaderDownloader::stopAllDataExchanges()
    {
        getInstance().internalStopAllDataExchanges();
    }

    GlobalUploaderDownloader::GlobalUploaderDownloader()
        : m_queueHolders()
        , m_mutex()
    {
        // Nothing to do here
    }

    GlobalUploaderDownloader& GlobalUploaderDownloader::getInstance()
    {
        // The meyer singleton
        static GlobalUploaderDownloader instance;

        return instance;
    }

    void GlobalUploaderDownloader::internalStopAllDataExchanges()
    {
        QMutexLocker locker(&m_mutex);

        // For each queue holder we have to set its dataExchangeStopped member to true and then call
        // wakeAll() on the wait condition
        foreach (__DataExchange_internal::QueueHolderBase* q, m_queueHolders) {
            q->dataExchangeStopped = true;
            q->waitCondition.wakeAll();
        }
    }

    void GlobalUploaderDownloader::addQueueHolder(__DataExchange_internal::QueueHolderBase* queueHolder)
    {
        QMutexLocker locker(&m_mutex);

        // Adding the queue holder to the set
        m_queueHolders.insert(queueHolder);
    }

    void GlobalUploaderDownloader::removeQueueHolder(__DataExchange_internal::QueueHolderBase* queueHolder)
    {
        // Here we don't acquire the mutex because this function is only called when an uploader or a
        // downloader is destroyed  and the functions called when one of those things happends already take
        // the lock (we could have made the mutex recursive, but it is not needed here)

        // Removing the queue holder from the set
        m_queueHolders.remove(queueHolder);
    }

} // end namespace farsa