From ea8840291cdf66784c6a2cb465b63ccfb5483c38 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Wed, 24 Sep 2014 01:38:30 +0200
Subject: New event-driven goodness

---
 src/control/EventBus.hpp | 58 +++++++++++++++++++++++++++++++++++-------------
 1 file changed, 43 insertions(+), 15 deletions(-)

(limited to 'src/control/EventBus.hpp')

diff --git a/src/control/EventBus.hpp b/src/control/EventBus.hpp
index ae4603f..7284883 100644
--- a/src/control/EventBus.hpp
+++ b/src/control/EventBus.hpp
@@ -27,12 +27,16 @@
 #pragma once
 
 
-#include "Event.hpp"
+#include "TimeProvider.hpp"
 
+#include <chrono>
+#include <condition_variable>
+#include <cstdint>
 #include <deque>
+#include <functional>
 #include <limits>
-#include <memory>
 #include <queue>
+#include <thread>
 
 
 namespace RPGEdit {
@@ -40,35 +44,59 @@ namespace RPGEdit {
 namespace Control {
 
 class EventBus {
-private:
-	typedef std::pair<uint64_t, std::shared_ptr<Event>> event_entry;
+public:
+	typedef std::function<void ()> Event;
+	typedef std::pair<uint64_t, Event> EventEntry;
 
-	static bool compare_events(const event_entry &e1, const event_entry &e2) {
+private:
+	static bool compare_events(const EventEntry &e1, const EventEntry &e2) {
 		return e1.first > e2.first;
 	}
 
-	std::priority_queue<event_entry, std::deque<event_entry>, bool (*)(const event_entry &, const event_entry &)> events;
+	std::priority_queue<EventEntry, std::deque<EventEntry>, bool (*)(const EventEntry &, const EventEntry &)> events;
+
+	std::mutex mutex;
+	std::condition_variable cond;
 
 public:
 	EventBus() : events(compare_events) {
 	}
 
-	void enqueue(const std::shared_ptr<Event> &event, uint64_t time) {
-		events.push(std::pair<uint64_t, std::shared_ptr<Event>>(time, event));
+	void enqueue(const Event &event, uint64_t time) {
+		std::lock_guard<std::mutex> lock(mutex);
+		events.push(EventEntry(time, event));
+		cond.notify_one();
 	}
 
-	std::pair<uint64_t, std::shared_ptr<Event>> get(uint64_t time) {
-		if (events.empty())
-			return std::make_pair<uint64_t, std::shared_ptr<Event>>(std::numeric_limits<uint64_t>::max(), nullptr);
+	EventEntry get(TimeProvider *timeProvider) {
+		std::unique_lock<std::mutex> lock(mutex);
+
+		while (true) {
+			if (events.empty()) {
+				cond.wait(lock);
+				continue;
+			}
 
-		std::pair<uint64_t, std::shared_ptr<Event>> top = events.top();
+			EventEntry top = events.top();
+			uint64_t time = timeProvider->now();
+
+			if (top.first > time) {
+				cond.wait_for(lock, std::chrono::milliseconds(top.first - time));
+				continue;
+			}
 
-		if (top.first <= time) {
 			events.pop();
 			return top;
 		}
-		else
-			return std::pair<uint64_t, std::shared_ptr<Event>>(top.first, std::shared_ptr<Event>());
+	}
+
+	uint64_t peek() {
+		std::lock_guard<std::mutex> lock(mutex);
+
+		if (events.empty())
+			return std::numeric_limits<uint64_t>::max();
+
+		return events.top().first;
 	}
 };
 
-- 
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