MessageManager.h

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// Copyright (c) 2025 Dave R. Smith. All rights reserved.
// Malena Framework — Proprietary Software. See LICENSE for terms.
 
//
// MessageManager.h
//
 
#ifndef MALENA_EVENTBUS_H
#define MALENA_EVENTBUS_H
 
#include <Malena/Core/malena_export.h>
#include <Malena/Core/DeferredOperationsManager.h>
#include <algorithm>
#include <functional>
#include <optional>
#include <tuple>
#include <typeindex>
#include <unordered_map>
#include <vector>
 
namespace ml
{
    class MALENA_API MessageManager : public DeferredOperationsManager<MessageManager>
    {
        using EventKey = std::tuple<std::type_index, int, std::type_index>;
 
        struct KeyHash
        {
            std::size_t operator()(const EventKey& key) const
            {
                auto h1 = std::get<0>(key).hash_code();
                auto h2 = std::hash<int>{}(std::get<1>(key));
                auto h3 = std::get<2>(key).hash_code();
                return h1 ^ (h2 << 1) ^ (h3 << 2);
            }
        };
 
        struct Subscription
        {
            void* subscriber;
            std::function<void(const void*)> callback;
        };
 
        static std::unordered_map<EventKey, std::vector<Subscription>, KeyHash>& subscribers();
 
        static void doUnsubscribe(const EventKey& key, void* subscriber);
        static void doUnsubscribeAll(void* subscriber);
 
    public:
        template<typename DataType, typename Enum>
        static void subscribe(Enum event, void* subscriber,
                              std::function<void(const DataType&)> callback);

        template<typename DataType, typename Enum>
        static void publish(Enum event, const DataType& data);

        template<typename DataType, typename Enum>
        static void unsubscribe(Enum event, void* subscriber);

        static void unsubscribeAll(void* subscriber);

        static void clear();


        static void forceUnsubscribeAll(void* subscriber);
    };
 
} // namespace ml
 
#include "../../../../src/Engine/Messaging/MessageManager.tpp"
#endif // MALENA_EVENTBUS_H