RegisterControllerMixin.hpp

#ifndef H_EXTENSIONS_CUTEHMI_MODBUS_4_INCLUDE_CUTEHMI_MODBUS_INTERNAL_REGISTERCONTROLLERMIXIN_HPP
#define H_EXTENSIONS_CUTEHMI_MODBUS_4_INCLUDE_CUTEHMI_MODBUS_INTERNAL_REGISTERCONTROLLERMIXIN_HPP
 
#include "common.hpp"
#include "functions.hpp"
#include "RegisterControllerTraits.hpp"
#include "../AbstractDevice.hpp"
 
#include <QBasicTimer>
#include <QJsonObject>
 
namespace cutehmi {
namespace modbus {
namespace internal {
 
template <typename DERIVED>
class RegisterControllerMixin
{
    protected:
        typedef typename RegisterControllerTraits<DERIVED>::ValueType ValueType;
 
        RegisterControllerMixin();
 
        void setValue(ValueType value);
 
        void writeValue();
 
        void timerEvent(QTimerEvent * event);
 
        void onRequestCompleted(QJsonObject request, QJsonObject reply);
 
        void clearPostponedWrite();
 
    private:
        const DERIVED & derived() const;
 
        DERIVED & derived();
};
 
template <typename DERIVED>
RegisterControllerMixin<DERIVED>::RegisterControllerMixin()
{
}
 
template <typename DERIVED>
void RegisterControllerMixin<DERIVED>::setValue(ValueType value)
{
    derived().m->requestedValue = value;
 
    if (derived().device() == nullptr)
        CUTEHMI_WARNING("Attempting to set value, but no device has been assigned to the controller.");
    else {
        if (derived().m->value != value) {
            derived().m->adjustingValue = true;
 
            if (derived().writeMode() == DERIVED::WRITE_DELAYED)
                derived().m->writeTimer.start(derived().writeDelay(), & derived());
            else if (derived().writeMode() == DERIVED::WRITE_POSTPONED) {
                // If m->requestId is not null, then controller has not finished with previous request yet.
                if (!derived().m->requestId.isNull())
                    derived().m->postponedWritePending = true;
                else
                    derived().writeValue();
            } else if (derived().writeMode() == DERIVED::WRITE_IMMEDIATE)
                derived().writeValue();
            // If write mode is WRITE_EXPLICIT, then do nothing.
        } else {
            if (derived().writeMode() == DERIVED::WRITE_DELAYED) {
                if (derived().m->requestId.isNull()) {
                    derived().m->adjustingValue = false;
                    derived().m->writeTimer.stop();
                } else {
                    derived().m->adjustingValue = true;
                    derived().m->writeTimer.start(derived().writeDelay(), & derived());
                }
            } else if (derived().writeMode() == DERIVED::WRITE_POSTPONED) {
                if (!derived().m->requestId.isNull()) {
                    derived().m->adjustingValue = true;
                    derived().m->postponedWritePending = true;
                }
            } else if ((derived().writeMode() == DERIVED::WRITE_IMMEDIATE) && (!derived().m->requestId.isNull()))
                derived().writeValue();
        }
    }
}
 
template<typename DERIVED>
void RegisterControllerMixin<DERIVED>::writeValue()
{
    derived().requestWrite(derived().m->requestedValue);
    derived().m->adjustingValue = false;
}
 
template<typename DERIVED>
void RegisterControllerMixin<DERIVED>::timerEvent(QTimerEvent * event)
{
    Q_UNUSED(event)
 
    derived().m->writeTimer.stop();
    derived().writeValue();
}
 
template<typename DERIVED>
void RegisterControllerMixin<DERIVED>::onRequestCompleted(QJsonObject request, QJsonObject reply)
{
    AbstractDevice::Function function = static_cast<AbstractDevice::Function>(request.value("function").toInt());
    QUuid requestId = QUuid::fromString(request.value("id").toString());
    bool success = reply.value("success").toBool();
    quint16 address = static_cast<quint16>(request.value("payload").toObject().value("address").toDouble());
    if (function == derived().writeRegisterFunction()) {
        if (requestId == derived().m->requestId) {
            if (success) {
                if (derived().readOnWrite() && derived().enabled())
                    // Non-null requestId implies that device is not null (see setDevice() and setupRegister()).
                    derived().requestReadRegisters(static_cast<quint16>(derived().address()), derived().bytes(), & derived().m->requestId);
                else {
                    derived().setBusy(derived().m->postponedWritePending);
 
                    emit derived().valueWritten();
 
                    // Without readOnWrite verification, written value acts as one, which is currently set in register.
                    derived().updateValue(request.value("payload").toObject().value("value"));
 
                    derived().m->requestId = QUuid();
                }
            } else {
                if (!derived().readOnWrite())
                    derived().setBusy(derived().m->postponedWritePending);
 
                emit derived().valueFailed();
 
                derived().m->requestId = QUuid();
            }
        }
    } else if (function == derived().readRegistersFunction()) {
        quint16 endAddress = address + static_cast<quint16>(request.value("payload").toObject().value("amount").toDouble()) - 1;
        if (static_cast<quint16>(derived().address()) >= address && static_cast<quint16>(derived().address()) <= endAddress) {
            if (requestId == derived().m->requestId) {
                // If requestId == m->requestId, then request must have been made by controller due to readOnWrite.
 
                derived().setBusy(!success || derived().m->postponedWritePending);
 
                // Non-null requestId implies that register is not null (see setDevice() and setupRegister()).
                if (success && (derived().verifyRegisterValue()))
                    emit derived().valueWritten();
                else
                    emit derived().valueMismatch(); // In case of read failure we can't verify value. Even though write request must have succeeded assume valueMismatch() in such case.
 
                derived().updateValue();
 
                derived().m->requestId = QUuid();
            } else if (derived().m->requestId.isNull()) {
                // Standard update, if controller is not waiting for its own request made due to readOnWrite.
 
                derived().setBusy(!success || derived().m->postponedWritePending);
 
                derived().updateValue();
            }
        }
    }
    clearPostponedWrite();
}
 
template<typename DERIVED>
void RegisterControllerMixin<DERIVED>::clearPostponedWrite()
{
    if (derived().m->postponedWritePending)
        derived().writeValue();
    derived().m->postponedWritePending = false;
}
 
template <typename DERIVED>
const DERIVED & RegisterControllerMixin<DERIVED>::derived() const
{
    return static_cast<const DERIVED &>(*this);
}
 
template <typename DERIVED>
DERIVED & RegisterControllerMixin<DERIVED>::derived()
{
    return static_cast<DERIVED &>(*this);
}
 
}
}
}
 
#endif
 
//(c)C: Copyright © 2022, Michał Policht <michal@policht.pl>. All rights reserved.
//(c)C: SPDX-License-Identifier: LGPL-3.0-or-later OR MIT
//(c)C: This file is a part of CuteHMI.
//(c)C: CuteHMI is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
//(c)C: CuteHMI 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 Lesser General Public License for more details.
//(c)C: You should have received a copy of the GNU Lesser General Public License along with CuteHMI.  If not, see <https://www.gnu.org/licenses/>.
//(c)C: Additionally, this file is licensed under terms of MIT license as expressed below.
//(c)C: 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:
//(c)C: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//(c)C: 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.