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129 lines
4.0 KiB
C++
129 lines
4.0 KiB
C++
/* Copyright (C) 2013
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* swift project Community / Contributors
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*
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* This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
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* directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
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* including this file, may be copied, modified, propagated, or distributed except according to the terms
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* contained in the LICENSE file.
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*/
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#ifndef BLACKMISC_THREADED_READER_H
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#define BLACKMISC_THREADED_READER_H
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//! \file
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#include "worker.h"
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#include <QReadWriteLock>
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#include <QDateTime>
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#include <QTimer>
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#include <QNetworkReply>
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#include <QFuture>
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#include <QCoreApplication>
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namespace BlackMisc
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{
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/*!
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* Support for threaded based reading and parsing tasks such
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* as data files via http, or file system and parsing (such as FSX models)
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*
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* \remarks Header only class to avoid forward instantiations across subprojects
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*/
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template <class FutureRet = void> class CThreadedReader : public CContinuousWorker
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{
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public:
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//! Thread safe, set update timestamp
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//! \threadsafe
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QDateTime getUpdateTimestamp() const
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{
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QReadLocker(&this->m_lock);
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return this->m_updateTimestamp;
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}
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//! Thread safe, set update timestamp
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//! \threadsafe
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void setUpdateTimestamp(const QDateTime &updateTimestamp)
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{
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QWriteLocker(&this->m_lock);
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this->m_updateTimestamp = updateTimestamp;
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}
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//! \copydoc CContinuousWorker::cleanup
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virtual void cleanup() override
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{
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// shutdown pending
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QWriteLocker(&this->m_lock);
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if (this->m_pendingFuture.isRunning())
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{
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// cancel does not work with all futures, especially not with QConcurrent::run
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// the stop flag should the job
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// but I will cancel anyway
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this->m_pendingFuture.cancel();
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}
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if (this->m_pendingNetworkReply && this->m_pendingNetworkReply->isRunning())
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{
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this->m_pendingNetworkReply->abort();
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}
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// cancel or stop flag above should terminate QFuture
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this->m_pendingFuture.waitForFinished();
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}
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/*!
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* Set the update time
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* \param updatePeriodMs <=0 stops the timer
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* \threadsafe
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*/
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void setInterval(int updatePeriodMs)
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{
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Q_ASSERT(this->m_updateTimer);
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QWriteLocker(&this->m_lock);
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if (updatePeriodMs < 1)
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this->m_updateTimer->stop();
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else
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this->m_updateTimer->start(updatePeriodMs);
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}
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//! Get the timer interval (ms)
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//! \threadsafe
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int interval() const
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{
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QReadLocker rl(&this->m_lock);
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return this->m_updateTimer->interval();
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}
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protected:
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//! Constructor
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CThreadedReader(QObject *owner) : CContinuousWorker(owner),
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m_updateTimer(new QTimer(this)), m_lock(QReadWriteLock::Recursive)
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{
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}
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//! Has pending network replay
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//! \threadsafe
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void setPendingNetworkReply(QNetworkReply *reply)
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{
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QWriteLocker(&this->m_lock);
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this->m_pendingNetworkReply = reply;
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}
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//! Has pending operation
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//! \threadsafe
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void setPendingFuture(QFuture<FutureRet> future)
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{
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QWriteLocker(&this->m_lock);
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this->m_pendingFuture = future;
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}
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QTimer *m_updateTimer = nullptr; //!< update timer
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mutable QReadWriteLock m_lock; //!< lock
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private:
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QDateTime m_updateTimestamp; //!< when was file / resource read
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QFuture<FutureRet> m_pendingFuture; //!< optional future to be stopped
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QNetworkReply *m_pendingNetworkReply = nullptr; //!< optional network reply to be stopped
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};
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} // namespace
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#endif // guard
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