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diff --git a/src/engine/machina/Controller.hpp b/src/engine/machina/Controller.hpp
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+/*
+  This file is part of Machina.
+  Copyright 2007-2014 David Robillard <http://drobilla.net>
+
+  Machina is free software: you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or any later version.
+
+  Machina is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Machina.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef MACHINA_CONTROLLER_HPP
+#define MACHINA_CONTROLLER_HPP
+
+#include <stdint.h>
+
+#include <set>
+
+#include "raul/RingBuffer.hpp"
+#include "raul/Maid.hpp"
+
+#include "machina/Model.hpp"
+#include "machina/URIs.hpp"
+#include "machina/types.hpp"
+
+#include "Stateful.hpp"
+
+namespace Raul {
+class Atom;
+}
+
+namespace machina {
+
+class Engine;
+class Machine;
+
+class Controller
+{
+public:
+	Controller(SPtr<Engine> engine, Model& model);
+
+	uint64_t create(const Properties& properties);
+	uint64_t connect(uint64_t tail_id, uint64_t head_id);
+
+	void set_property(uint64_t object_id, URIInt key, const Atom& value);
+
+	void learn(SPtr<Raul::Maid> maid, uint64_t node_id);
+	void disconnect(uint64_t tail_id, uint64_t head_id);
+	void erase(uint64_t id);
+
+	void announce(SPtr<Machine> machine);
+
+	void process_updates();
+
+private:
+	SPtr<Stateful> find(uint64_t id);
+
+	struct StatefulComparator {
+		inline bool operator()(SPtr<Stateful> a, SPtr<Stateful> b) const {
+			return a->id() < b->id();
+		}
+	};
+
+	typedef std::set<SPtr<Stateful>, StatefulComparator> Objects;
+	Objects _objects;
+
+	SPtr<Engine> _engine;
+	Model&       _model;
+
+	SPtr<Raul::RingBuffer> _updates;
+};
+
+}
+
+#endif // MACHINA_CONTROLLER_HPP