From 6a00886804c53883d919f008f6ec47a574d86607 Mon Sep 17 00:00:00 2001
From: LaG1924 <12997935+LaG1924@users.noreply.github.com>
Date: Mon, 24 Jul 2017 19:52:24 +0500
Subject: 2017-07-24

---
 src/core/Event.hpp | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/core/Event.hpp

(limited to 'src/core/Event.hpp')

diff --git a/src/core/Event.hpp b/src/core/Event.hpp
new file mode 100644
index 0000000..cfa990a
--- /dev/null
+++ b/src/core/Event.hpp
@@ -0,0 +1,96 @@
+#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);
+	}
+};
\ No newline at end of file
-- 
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