add event system and use it to propagate to print traces

src/lib/eventsystem/EventManager.h

@@ -0,0 +1,43 @@
+#ifndef EVENT_MANAGER_H
+#define EVENT_MANAGER_H
+
+#include <map>
+#include <memory>
+#include <mutex>
+#include <vector>
+
+#include "Event.h"
+
+class EventHandlerBase;
+
+class EventManager
+{
+public:
+	static std::shared_ptr<EventManager> getInstance();
+	static void destroyInstance();
+
+private:
+	static std::shared_ptr<EventManager> s_instance;
+
+public:
+	EventManager(EventManager const &) = delete;
+	void operator=(EventManager const &) = delete;
+
+	void registerEventHandler(EventHandlerBase *eventHandler);
+	void unregisterEventHandler(EventHandlerBase *eventHandler);
+	void sendEventImmediately(std::shared_ptr<Event> event);
+	void addEvent(std::shared_ptr<Event> event);
+	void processEvents();
+
+	bool hasEvents() const;
+
+private:
+	EventManager() = default;
+
+	std::map<unsigned int, EventHandlerBase *> m_eventHandlers;
+	std::vector<std::shared_ptr<Event>> m_events;
+	std::mutex m_eventHandlersMutex;
+	std::mutex m_eventsMutex;
+};
+
+#endif   // EVENT_MANAGER_H