Add (currently unused) event bus

2 files changed, 120 insertions, 0 deletions

diff --git a/src/control/Event.hpp b/src/control/Event.hpp
new file mode 100644
index 0000000..1b2d30a
--- /dev/null
+++ b/src/control/Event.hpp
@@ -0,0 +1,43 @@
+/*
+  Copyright (c) 2014, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#pragma once
+
+
+namespace RPGEdit {
+
+namespace Control {
+
+class Event {
+public:
+	virtual void handle() = 0;
+
+	virtual ~Event() {}
+};
+
+}
+
+}
diff --git a/src/control/EventBus.hpp b/src/control/EventBus.hpp
new file mode 100644
index 0000000..ae4603f
--- /dev/null
+++ b/src/control/EventBus.hpp
@@ -0,0 +1,77 @@
+/*
+  Copyright (c) 2014, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#pragma once
+
+
+#include "Event.hpp"
+
+#include <deque>
+#include <limits>
+#include <memory>
+#include <queue>
+
+
+namespace RPGEdit {
+
+namespace Control {
+
+class EventBus {
+private:
+	typedef std::pair<uint64_t, std::shared_ptr<Event>> event_entry;
+
+	static bool compare_events(const event_entry &e1, const event_entry &e2) {
+		return e1.first > e2.first;
+	}
+
+	std::priority_queue<event_entry, std::deque<event_entry>, bool (*)(const event_entry &, const event_entry &)> events;
+
+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));
+	}
+
+	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);
+
+		std::pair<uint64_t, std::shared_ptr<Event>> top = events.top();
+
+		if (top.first <= time) {
+			events.pop();
+			return top;
+		}
+		else
+			return std::pair<uint64_t, std::shared_ptr<Event>>(top.first, std::shared_ptr<Event>());
+	}
+};
+
+}
+
+}