DescriptorEventPublisher.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 CORE_DESCRIPTOREVENTPUBLISHER_H
#define CORE_DESCRIPTOREVENTPUBLISHER_H
 
namespace core {
    class DescriptorEventReceiver;
} // namespace core
 
namespace utils {
    class Timeval;
} // namespace utils
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include <list>
#include <map>
#include <string>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace core {
 
    class DescriptorEventPublisher {
    public:
    protected:
        DescriptorEventPublisher(std::string name);
 
    public:
        DescriptorEventPublisher() = delete;
 
        virtual ~DescriptorEventPublisher();
 
        DescriptorEventPublisher(const DescriptorEventPublisher&) = delete;
        DescriptorEventPublisher& operator=(const DescriptorEventPublisher&) = delete;
 
        void enable(DescriptorEventReceiver* descriptorEventReceiver);
        void disable(DescriptorEventReceiver* descriptorEventReceiver);
        void suspend(DescriptorEventReceiver* descriptorEventReceiver);
        void resume(DescriptorEventReceiver* descriptorEventReceiver);
 
        virtual void spanActiveEvents() = 0;
        void checkTimedOutEvents(const utils::Timeval& currentTime);
        void releaseDisabledEvents(const utils::Timeval& currentTime);
 
        int getObservedEventReceiverCount() const;
        int maxFd() const;
 
        utils::Timeval getNextTimeout(const utils::Timeval& currentTime) const;
 
        void signal(int sigNum);
        void disable();
 
        const std::string& getName() const;
 
    protected:
        std::map<int, std::list<DescriptorEventReceiver*>> observedEventReceiverLists;
        unsigned long eventCounter = 0;
 
    private:
        virtual void muxAdd(DescriptorEventReceiver* descriptorEventReceiver) = 0;
        virtual void muxDel(int fd) = 0;
        virtual void muxOn(DescriptorEventReceiver* descriptorEventReceiver) = 0;
        virtual void muxOff(DescriptorEventReceiver* descriptorEventReceiver) = 0;
 
        std::string name;
        std::map<std::list<DescriptorEventReceiver*>*, std::list<DescriptorEventReceiver*>> dirtyEventReceiverLists;
    };
 
} // namespace core
 
#endif // CORE_DESCRIPTOREVENTPUBLISHER_H