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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 (C) 2010 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
+ * (at your option) 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/SharedPtr.hpp"
+#include "raul/RingBuffer.hpp"
+
+#include "machina/types.hpp"
+#include "machina/URIs.hpp"
+
+#include "Stateful.hpp"
+
+namespace Raul { class Atom; class Maid; }
+
+namespace Machina {
+
+class Engine;
+class Machine;
+class Stateful;
+
+namespace Client { class ClientModel; class ClientObject; }
+
+class Controller {
+public:
+	Controller(SharedPtr<Engine> engine, Client::ClientModel& client_model);
+
+	uint64_t create(const Client::ClientObject& obj);
+	uint64_t connect(uint64_t tail_id, uint64_t head_id);
+	void     set_property(uint64_t object_id, URIInt key, const Raul::Atom& value);
+	void     learn(SharedPtr<Raul::Maid> maid, uint64_t node_id);
+	void     disconnect(uint64_t tail_id, uint64_t head_id);
+	void     erase(uint64_t id);
+
+	void announce(SharedPtr<Machine> machine);
+
+	void process_updates();
+
+private:
+	SharedPtr<Stateful> find(uint64_t id);
+
+	struct StatefulComparator {
+		inline bool operator()(SharedPtr<Stateful> lhs, SharedPtr<Stateful> rhs) const {
+			return lhs->id() < rhs->id();
+		}
+	};
+	
+	typedef std::set<SharedPtr<Stateful>, StatefulComparator> Objects;
+	Objects _objects;
+
+	SharedPtr<Engine>    _engine;
+	Client::ClientModel& _client_model;
+
+	SharedPtr<UpdateBuffer> _updates;
+};
+
+}
+
+#endif // MACHINA_CONTROLLER_HPP