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diff --git a/src/libs/engine/Engine.hpp b/src/libs/engine/Engine.hpp
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+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Ingen 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 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Ingen 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 details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef ENGINE_H
+#define ENGINE_H
+
+#include <cassert>
+#include <boost/utility.hpp>
+#include <raul/SharedPtr.hpp>
+#include "DataType.hpp"
+
+template<typename T> class Queue;
+
+namespace Raul { class Maid; }
+
+namespace Ingen {
+
+class AudioDriver;
+class MidiDriver;
+class OSCDriver;
+class NodeFactory;
+class ClientBroadcaster;
+class Patch;
+class ObjectStore;
+class EventSource;
+class PostProcessor;
+class Event;
+class QueuedEvent;
+class QueuedEngineInterface;
+class LashDriver;
+class Driver;
+
+
+/** The main class for the Engine.
+ *
+ * This is a (GoF) facade for the engine.  Pointers to all components are
+ * available for more advanced control than this facade allows.
+ *
+ * \ingroup engine
+ */
+class Engine : boost::noncopyable
+{
+public:
+	Engine();
+	virtual ~Engine();
+
+	virtual int  main();
+	virtual bool main_iteration();
+	
+	/** Set the quit flag that should kill all threads and exit cleanly.
+	 * Note that it will take some time. */
+	virtual void quit() { _quit_flag = true; }
+
+	virtual void start_jack_driver();
+	virtual void start_osc_driver(int port);
+	
+	virtual SharedPtr<QueuedEngineInterface> new_queued_interface();
+
+	//virtual void set_event_source(SharedPtr<EventSource>);
+	
+	virtual bool activate();
+	virtual void deactivate();
+
+	virtual bool activated() { return _activated; }
+
+	Raul::Maid*        maid()               const { return _maid; }
+	EventSource*       event_source()       const { return _event_source.get(); }
+	AudioDriver*       audio_driver()       const { return _audio_driver.get(); }
+	MidiDriver*        midi_driver()        const { return _midi_driver; }
+	OSCDriver*         osc_driver()         const { return _osc_driver; }
+	PostProcessor*     post_processor()     const { return _post_processor; }
+	ClientBroadcaster* broadcaster()        const { return _broadcaster; }
+	ObjectStore*       object_store()       const { return _object_store; }
+	NodeFactory*       node_factory()       const { return _node_factory; }
+	LashDriver*        lash_driver()        const { return _lash_driver; }
+
+	/** Return the active driver for the given type */
+	Driver* driver(DataType type);
+	
+private:
+	SharedPtr<EventSource> _event_source;
+	SharedPtr<AudioDriver> _audio_driver;
+	MidiDriver*            _midi_driver;
+	OSCDriver*             _osc_driver;
+	Raul::Maid*            _maid;
+	PostProcessor*         _post_processor;
+	ClientBroadcaster*     _broadcaster;
+	ObjectStore*           _object_store;
+	NodeFactory*           _node_factory;
+	LashDriver*            _lash_driver;
+	
+	bool _quit_flag;
+	bool _activated;
+};
+
+
+} // namespace Ingen
+
+#endif // ENGINE_H