OSCAR-code/3rdparty/qtserialport/examples/serialport/blockingmaster/masterthread.cpp

/****************************************************************************
**
** Copyright (C) 2012 Denis Shienkov <denis.shienkov@gmail.com>
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtSerialPort module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** use the contact form at http://qt.digia.com/contact-us.
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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** rights.  These rights are described in the Digia Qt LGPL Exception
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#include "masterthread.h"

#include <QtSerialPort/QSerialPort>

#include <QTime>

QT_USE_NAMESPACE

MasterThread::MasterThread(QObject *parent)
    : QThread(parent), waitTimeout(0), quit(false)
{
}

//! [0]
MasterThread::~MasterThread()
{
    mutex.lock();
    quit = true;
    cond.wakeOne();
    mutex.unlock();
    wait();
}
//! [0]

//! [1] //! [2]
void MasterThread::transaction(const QString &portName, int waitTimeout, const QString &request)
{
    //! [1]
    QMutexLocker locker(&mutex);
    this->portName = portName;
    this->waitTimeout = waitTimeout;
    this->request = request;
    //! [3]
    if (!isRunning())
        start();
    else
        cond.wakeOne();
}
//! [2] //! [3]

//! [4]
void MasterThread::run()
{
    bool currentPortNameChanged = false;

    mutex.lock();
    //! [4] //! [5]
    QString currentPortName;
    if (currentPortName != portName) {
        currentPortName = portName;
        currentPortNameChanged = true;
    }

    int currentWaitTimeout = waitTimeout;
    QString currentRequest = request;
    mutex.unlock();
    //! [5] //! [6]
    QSerialPort serial;

    while (!quit) {
        //![6] //! [7]
        if (currentPortNameChanged) {
            serial.close();
            serial.setPortName(currentPortName);

            if (!serial.open(QIODevice::ReadWrite)) {
                emit error(tr("Can't open %1, error code %2")
                           .arg(portName).arg(serial.error()));
                return;
            }
        }
        //! [7] //! [8]
        // write request
        QByteArray requestData = currentRequest.toLocal8Bit();
        serial.write(requestData);
        if (serial.waitForBytesWritten(waitTimeout)) {
            //! [8] //! [10]
            // read response
            if (serial.waitForReadyRead(currentWaitTimeout)) {
                QByteArray responseData = serial.readAll();
                while (serial.waitForReadyRead(10))
                    responseData += serial.readAll();

                QString response(responseData);
                //! [12]
                emit this->response(response);
                //! [10] //! [11] //! [12]
            } else {
                emit timeout(tr("Wait read response timeout %1")
                             .arg(QTime::currentTime().toString()));
            }
            //! [9] //! [11]
        } else {
            emit timeout(tr("Wait write request timeout %1")
                         .arg(QTime::currentTime().toString()));
        }
        //! [9]  //! [13]
        mutex.lock();
        cond.wait(&mutex);
        if (currentPortName != portName) {
            currentPortName = portName;
            currentPortNameChanged = true;
        } else {
            currentPortNameChanged = false;
        }
        currentWaitTimeout = waitTimeout;
        currentRequest = request;
        mutex.unlock();
    }
    //! [13]
}