Worker.hpp

#ifndef H_EXTENSIONS_CUTEHMI_2_INCLUDE_CUTEHMI_WORKER_HPP
#define H_EXTENSIONS_CUTEHMI_2_INCLUDE_CUTEHMI_WORKER_HPP
 
#include "internal/common.hpp"
 
#include <QObject>
#include <QEvent>
#include <QMutex>
#include <QWaitCondition>
#include <QThread>
 
#include <functional>
 
namespace cutehmi {
 
class CUTEHMI_API Worker:
    public QObject
{
        typedef QObject Parent;
 
        Q_OBJECT
 
    public:
        Worker(std::function<void()> task = nullptr);
 
        Worker(QThread & thread);
 
        ~Worker() override;
 
        std::function<void()> task() const;
 
        void setTask(std::function<void()> task);
 
        void wait() const;
 
        bool isReady() const;
 
        bool isWorking() const;
 
        void employ(QThread & thread, bool start = true);
 
        void work();
 
    signals:
        void ready();
 
    protected:
        class WorkEvent:
            public QEvent
        {
            public:
                static Type RegisteredType() noexcept;
 
            public:
                WorkEvent();
        };
 
        virtual void job();
 
        bool event(QEvent * event) override;
 
    private:
        enum class State {
            UNEMPLOYED,
            EMPLOYED,
            WORKING,
            READY
        };
 
        struct Members
        {
            State state;
            std::function<void()> task;
            mutable QMutex stateMutex;
            mutable QWaitCondition waitCondition;
            mutable QMutex workMutex;
 
            Members(std::function<void()> p_task):
                state(State::UNEMPLOYED),
                task(p_task)
            {
            }
        };
 
        MPtr<Members> m;
};
 
}
 
#endif
 
//(c)C: Copyright © 2018-2020, Michał Policht <michal@policht.pl>. All rights reserved.
//(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/>.