/* Copyright (C) 2017
 * swift Project Community / Contributors
 *
 * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 */

//! \file

#ifndef BLACKMISC_SHAREDSTATE_DATALINKLOCAL_H
#define BLACKMISC_SHAREDSTATE_DATALINKLOCAL_H

#include "blackmisc/sharedstate/datalink.h"
#include "blackmisc/variant.h"
#include "blackmisc/blackmiscexport.h"
#include <QObject>
#include <QFuture>
#include <QMutex>

namespace BlackMisc
{
    namespace SharedState
    {
        /*!
         * A transport mechanism using signals and slots in the local process.
         * \ingroup SharedState
         */
        class BLACKMISC_EXPORT CDataLinkLocal : public QObject, public IDataLink
        {
            Q_OBJECT
            Q_INTERFACES(BlackMisc::SharedState::IDataLink)

        public:
            //! Constructor.
            CDataLinkLocal(QObject *parent = nullptr);

            //! Destructor.
            virtual ~CDataLinkLocal() override;

            virtual void publish(const CPassiveMutator *mutator) override;
            virtual void publish(const CActiveMutator *mutator) override;
            virtual void subscribe(const CPassiveObserver *observer) override;
            virtual void subscribe(const CActiveObserver *observer) override;

        private:
            struct Channel
            {
                QWeakPointer<const CActiveMutator> activeMutator;
                QVector<QWeakPointer<const CPassiveObserver>> passiveObservers;
            };

            void dispatchEvent(const CVariant &param, const QString &channel);
            QFuture<CVariant> handleRequest(const CVariant &param, const QString &channel);
            Channel &getChannel(const QString &name);
            Channel &getChannel(const QObject *object);

            QMap<QString, Channel> m_channels;
            mutable QMutex m_channelsMutex { QMutex::Recursive };
        };
    }
}

#endif