From fa32e7a9f46c7da39a527d0ebc049e3720068d8e Mon Sep 17 00:00:00 2001
From: LaG1924 <12997935+LaG1924@users.noreply.github.com>
Date: Fri, 29 Dec 2017 17:09:51 +0500
Subject: Implemented new event system

---
 src/Event.cpp |  49 ++++++++++++++++++++++
 src/Event.hpp | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 179 insertions(+)

diff --git a/src/Event.cpp b/src/Event.cpp
index 00f67c0..c857947 100644
--- a/src/Event.cpp
+++ b/src/Event.cpp
@@ -1 +1,50 @@
 #include "Event.hpp"
+
+std::list<EventListener*> EventSystem::listeners;
+std::mutex EventSystem::listenersMutex;
+
+EventListener::EventListener() {
+	std::lock_guard<std::mutex> listenersLock(EventSystem::listenersMutex);
+	EventSystem::listeners.push_back(this);
+}
+
+EventListener::~EventListener() {
+	std::lock_guard<std::mutex> listenersLock(EventSystem::listenersMutex);
+	EventSystem::listeners.remove(this);
+}
+
+void EventListener::HandleEvent() {
+	std::lock_guard<std::mutex> lock(eventsQueueMutex);
+	std::lock_guard<std::mutex> lockHandlers(handlersMutex);
+	Event event = events.front();
+	events.pop();	
+	if (handlers[event.id]) {
+		handlers[event.id](event);
+	}
+}
+
+void EventListener::HandleAllEvents() {
+	std::lock_guard<std::mutex> lock(eventsQueueMutex);
+	std::lock_guard<std::mutex> lockHandlers(handlersMutex);
+	while (!events.empty()) {
+		Event event = events.front();
+		events.pop();
+		if (handlers[event.id]) {
+			handlers[event.id](event);
+		}
+	}	
+}
+
+bool EventListener::NotEmpty() {
+	std::lock_guard<std::mutex> lock(eventsQueueMutex);
+	return !events.empty();
+}
+
+void EventListener::WaitEvent() {
+	eventsQueueMutex.lock();
+	while (events.empty()) {
+		eventsQueueMutex.unlock();
+		eventsQueueMutex.lock();
+	}
+	eventsQueueMutex.unlock();
+}
\ No newline at end of file
diff --git a/src/Event.hpp b/src/Event.hpp
index 3f59c93..752fda4 100644
--- a/src/Event.hpp
+++ b/src/Event.hpp
@@ -1,2 +1,132 @@
 #pragma once
 
+#include <typeinfo>
+#include <memory>
+#include <functional>
+#include <queue>
+#include <map>
+#include <list>
+#include <mutex>
+
+
+size_t constexpr StrHash(char const *input) {
+	return *input ? static_cast<size_t>(*input) + 33 * StrHash(input + 1) : 5381;
+}
+
+class Event {
+	struct EventDataBase {
+		virtual ~EventDataBase() {}
+		virtual const std::type_info& Type() const = 0;
+	};
+
+	template<typename T>
+	struct EventData : EventDataBase {
+		EventData(const T &val) : data(val) {}
+
+		const std::type_info& Type() const override {
+			return typeid(data);
+		}
+
+		T data;
+	};
+
+	std::shared_ptr<EventDataBase> data;
+
+public:
+	const size_t id;
+
+	template<typename T>
+	Event(size_t eventId, const T &value) :
+		id(eventId),
+		data(std::make_shared<EventData<T>>(value)) {}
+
+	~Event() = default;
+
+	Event(const Event &other) = default;
+
+	Event &operator=(const Event &) = default;
+
+	Event(Event &&) = delete;
+
+	Event &operator=(Event &&) = delete;
+
+	template<typename T>
+	const T& get() const {
+		if (typeid(T) != data->Type())
+			throw std::runtime_error(std::string("Type ") + typeid(T).name() + " encountered but " + data->Type().name() + " expected");
+		return static_cast<EventData<T>*>(data.get())->data;
+	}
+};
+
+class EventListener {
+	friend class EventSystem;
+	using HandlerType = std::function<void(const Event&)>;
+	std::queue<Event> events;
+	std::map<size_t, HandlerType> handlers;
+	std::mutex eventsQueueMutex;
+	std::mutex handlersMutex;
+public:
+	EventListener();
+
+	~EventListener();
+
+	void HandleEvent();
+
+	void HandleAllEvents();
+
+	bool NotEmpty();
+
+	void WaitEvent();
+
+	void RegisterHandler(size_t eventId, const HandlerType &data) {
+		std::lock_guard<std::mutex> lock(handlersMutex);
+		handlers[eventId] = data;
+	}
+
+	void RegisterHandler(const char *eventId, const HandlerType & data) {
+		RegisterHandler(StrHash(eventId), data);
+	}
+};
+
+class EventSystem {
+	friend class EventListener;
+	static std::list<EventListener*> listeners;
+	static std::mutex listenersMutex;
+
+public:
+	template <typename T>
+	static void PushEvent(size_t eventId, T data) {
+		Event event(eventId, data);
+
+		std::lock_guard<std::mutex> listenersLock(listenersMutex);
+		for (auto& listener : listeners) {
+			std::lock_guard<std::mutex> lock(listener->eventsQueueMutex);
+			std::lock_guard<std::mutex> lockHandlers(listener->handlersMutex);
+			auto it = listener->handlers.find(eventId);
+			if (it == listener->handlers.end())
+				continue;			
+
+			listener->events.push(event);
+		}
+	}
+
+	template <typename T>
+	static void DirectEventCall(size_t eventId, T data) {
+		Event event(eventId, data);
+
+		std::lock_guard<std::mutex> listenersLock(listenersMutex);
+		for (auto & listener : listeners) {
+			std::lock_guard<std::mutex> lock(listener->eventsQueueMutex);
+			std::lock_guard<std::mutex> lockHandlers(listener->handlersMutex);
+			auto it = listener->handlers.find(eventId);
+			if (it == listener->handlers.end())
+				continue;			
+
+			it->second(event);
+		}
+	}
+};
+
+#define PUSH_EVENT(eventName, data) EventSystem::PushEvent(StrHash(eventName),data)
+
+#define DIRECT_EVENT_CALL(eventName,data) EventSystem::DirectEventCall(StrHash(eventName),data)
\ No newline at end of file
-- 
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