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#pragma once
#include <queue>
#include <map>
#include <thread>
#include <mutex>
#include <condition_variable>
#include <chrono>
#include <variant>
#include <functional>
#include <Vector.hpp>
enum class EventType {
Echo,
ChunkChanged,
};
struct EchoData {
std::chrono::time_point<std::chrono::high_resolution_clock> time;
};
struct ChunkChangedData {
Vector chunkPosition;
};
using EventData = std::variant<EchoData, ChunkChangedData>;
struct Event {
EventType type;
EventData data;
};
class EventListener {
friend class EventAgregator;
using HandlerFunc = std::function<void(EventData)>;
std::map<EventType, HandlerFunc> handlers; //TODO: There must be more elegant solution than std::variant of all data
std::mutex eventsMutex;
std::queue<Event> events;
void PushEvent(Event event);
public:
EventListener();
~EventListener();
bool IsEventsQueueIsNotEmpty();
void RegisterHandler(EventType type, HandlerFunc handler) {
handlers[type] = handler;
}
void HandleEvent() {
eventsMutex.lock();
if (events.empty()) {
eventsMutex.unlock();
return;
}
Event event = events.front();
events.pop();
eventsMutex.unlock();
auto function = handlers[event.type];
function(event.data);
}
};
class EventAgregator {
friend EventListener;
EventAgregator() = default;
static std::queue<Event> eventsToHandle;
static std::mutex queueMutex;
static bool isStarted;
static std::vector<EventListener *> listeners;
static std::mutex listenersMutex;
static void EventHandlingLoop();
static void RegisterListener(EventListener &listener);
static void UnregisterListener(EventListener &listener);
public:
static void PushEvent(EventType type, EventData data) {
if (!isStarted) {
isStarted = true;
std::thread(&EventAgregator::EventHandlingLoop).detach();
}
Event event;
event.type = type;
event.data = data;
eventsToHandle.push(event);
}
};
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