32b0e19a
 Steven de Ridder
Initial commit. d...
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/* ****************************************************************************
* Copyright 2019 Open Systems Development BV *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the "Software"), *
* to deal in the Software without restriction, including without limitation *
* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
* and/or sell copies of the Software, and to permit persons to whom the *
* Software is furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included in *
* all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
* DEALINGS IN THE SOFTWARE. *
* ***************************************************************************/
#ifndef OSDEV_COMPONENTS_TRANSQUEUE_H
#define OSDEV_COMPONENTS_TRANSQUEUE_H
#include "ormreldata.h"
#include <QObject>
#include <QQueue>
#include <QTimer>
#include <QMutex>
#include <QMutexLocker>
/*
* _________________________________________
* / If voting could change the system, it \
* | would be illegal. If not voting could |
* \ change the system, it would be illegal. /
* -----------------------------------------
* \
* \
* .--.
* |o_o |
* |:_/ |
* // \ \
* (| | )
* /'\_ _/`\
* \___)=(___/
*
*/
namespace osdev {
namespace components {
/*!
* \class TransQueue
* \brief The TransQueue class implements a transaction queue which will
* catch rejected transactions from the ORM layer and offers them
* back through the ETL-layer. An ORMRelPackage is "tagged" with
* a transacion-id, which will keep track on how many times an
* ORMRelPackage enters the queue. If the "TTL_iD (Time_To_live)"
* reaches zero, the package is dropped and the ID is removed from
* the administration.
*/
class TransQueue : public QObject
{
Q_OBJECT
public:
/*!
* \brief Represents a queue of transactions.
* \param parent The parent QObject instance.
*/
explicit TransQueue( QObject *parent = nullptr );
// Deleted copy- and move constructors
TransQueue( const TransQueue& ) = delete;
TransQueue( const TransQueue&& ) = delete;
TransQueue& operator=( const TransQueue& ) = delete;
TransQueue& operator=( const TransQueue&& ) = delete;
/*!
* \brief Sets the TimeOut.
* \param milliseconds The timeout to set in milliseconds.
*/
void setTimeOut( int milliseconds = 1 );
/*!
* \return Whether this instance is currently processing transactions.
*/
bool processing() const;
/*!
* \brief Starts processing of transactions.
* \param force Forces start of processing.
*/
void startProcessing( bool force = false );
/*!
* \brief Stops processing of transactions.
* \param force Forces stop of processing.
*/
void stopProcessing( bool force = false );
/*!
* \return The number of currently outstanding transactions.
*/
int transactions() const { return m_queue.size(); }
private:
/*!
* \brief This method will write the Contents of the data structure
* to a transaction file for archiving and traceability purposes.
* Not really decided on the format yet, but this will evolve over time.
* \param data - The datastructure we want to write to a transaction Logfile.
* Send as pointer. After writing to disk, the object have to be deleted.
*/
bool dumpToDisk( const QSharedPointer<ORMRelData>& data ) const;
int m_TTL; ///< Time to Live start value.
QTimer m_queueTimer; ///< Timer controlling the processing of the queue.
QMutex m_queueMutex; ///< Mutex to prevent race conditions. Although QQueue is thread safe, we have to make sure *we* are.
QQueue<QSharedPointer<ORMRelData>> m_queue; ///< The actual FIFO taking an ORMRelData pointer as input.
signals:
void signalProcessData( QSharedPointer<ORMRelData> pData );
public slots:
/*!
* \brief Sets (adds) a transaction to the queue.
* \param pData The transaction data to set.
*/
void setTransaction( const QSharedPointer<ORMRelData>& pData );
private slots:
/*!
* \brief slotProcessQueue
*/
void slotProcessQueue();
};
} /* End namespace components */
} /* End namespace osdev */
#endif /* OSDEV_COMPONENTS_TRANSQUEUE_H */
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