SubProtocolFactory.h

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/*
 * SNode.C - a slim toolkit for network communication
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2020, 2021, 2022, 2023, 2024, 2025
 *
 * This program 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.
 *
 * This program 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.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef WEB_WEBSOCKET_SUBPROTOCOLPLUGININTERFACE_H
#define WEB_WEBSOCKET_SUBPROTOCOLPLUGININTERFACE_H
 
namespace web::websocket {
    template <typename SubProtocolT, typename RequestT, typename ResponseT>
    class SocketContextUpgrade;
    class SubProtocolContext;
} // namespace web::websocket
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include <string> // IWYU pragma: export
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace web::websocket {
 
    template <typename SubProtocolT>
    class SubProtocolFactory {
    public:
        using SubProtocol = SubProtocolT;
 
        SubProtocolFactory() = delete;
 
        SubProtocolFactory(const std::string& name)
            : subProtocolName(name) {
        }
 
        SubProtocolFactory(SubProtocolFactory&) = delete;
        SubProtocolFactory(SubProtocolFactory&&) = delete;
 
        SubProtocolFactory& operator=(SubProtocolFactory&) = delete;
        SubProtocolFactory& operator=(SubProtocolFactory&&) = delete;
 
        virtual ~SubProtocolFactory() = default;
 
        SubProtocol* createSubProtocol(SubProtocolContext* subProtocolContext) {
            SubProtocol* subProtocol = create(subProtocolContext);
 
            if (subProtocol != nullptr) {
                refCount++;
            }
 
            return subProtocol;
        }
 
    private:
        virtual SubProtocol* create(SubProtocolContext* subProtocolContext) = 0;
 
    public:
        virtual std::size_t deleteSubProtocol(SubProtocol* subProtocol) {
            if (subProtocol != nullptr) {
                delete subProtocol;
 
                refCount--;
            }
 
            return refCount;
        }
 
        const std::string& getName() {
            return subProtocolName;
        }
 
        void setHandle(void* handle) {
            this->handle = handle;
        }
 
        void* getHandle() {
            return handle;
        }
 
    private:
        std::size_t refCount = 0;
 
        std::string subProtocolName;
 
        void* handle = nullptr;
    };
 
} // namespace web::websocket
 
#endif // WEB_WEBSOCKET_SUBPROTOCOLPLUGININTERFACE_H