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authorLaG1924 <12997935+LaG1924@users.noreply.github.com>2017-12-29 13:09:51 +0100
committerLaG1924 <12997935+LaG1924@users.noreply.github.com>2018-01-13 03:39:33 +0100
commitfa32e7a9f46c7da39a527d0ebc049e3720068d8e (patch)
tree8d5910c7eb87f7ef338bf68e75aeb1a98f931ac9 /src/Event.hpp
parentRemoved previous implementation of event-system (diff)
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Diffstat (limited to 'src/Event.hpp')
-rw-r--r--src/Event.hpp130
1 files changed, 130 insertions, 0 deletions
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