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diff --git a/src/server/ServerInterfaceImpl.hpp b/src/server/ServerInterfaceImpl.hpp
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+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 INGEN_ENGINE_QUEUEDENGINEINTERFACE_HPP
+#define INGEN_ENGINE_QUEUEDENGINEINTERFACE_HPP
+
+#include <inttypes.h>
+#include <string>
+#include <memory>
+#include "raul/SharedPtr.hpp"
+#include "ingen/ClientInterface.hpp"
+#include "ingen/ServerInterface.hpp"
+#include "ingen/Resource.hpp"
+#include "EventSource.hpp"
+#include "Request.hpp"
+#include "types.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class Engine;
+
+/** A queued (preprocessed) event source / interface.
+ *
+ * This is the bridge between the ServerInterface presented to the client, and
+ * the EventSource that needs to be presented to the Driver.
+ *
+ * Responses occur through the event mechanism (which notified clients in
+ * event post_process methods) and are related to an event by an integer ID.
+ * If you do not register a request, you have no way of knowing if your calls
+ * are successful.
+ */
+class ServerInterfaceImpl : public EventSource,
+                              public ServerInterface
+{
+public:
+	ServerInterfaceImpl(Engine& engine);
+	virtual ~ServerInterfaceImpl();
+
+	Raul::URI uri() const { return "http://drobilla.net/ns/ingen#internal"; }
+
+	void set_next_response_id(int32_t id);
+
+	// Client registration
+	virtual void register_client(ClientInterface* client);
+	virtual void unregister_client(const Raul::URI& uri);
+
+	// Bundles
+	virtual void bundle_begin();
+	virtual void bundle_end();
+
+	// CommonInterface object commands
+
+	virtual void put(const Raul::URI&            path,
+	                 const Resource::Properties& properties,
+	                 const Resource::Graph       g=Resource::DEFAULT);
+
+	virtual void delta(const Raul::URI&            path,
+	                   const Resource::Properties& remove,
+	                   const Resource::Properties& add);
+
+	virtual void move(const Raul::Path& old_path,
+	                  const Raul::Path& new_path);
+
+	virtual void connect(const Raul::Path& src_port_path,
+	                     const Raul::Path& dst_port_path);
+
+	virtual void disconnect(const Raul::URI& src,
+	                        const Raul::URI& dst);
+
+	virtual void set_property(const Raul::URI& subject_path,
+	                          const Raul::URI&  predicate,
+	                          const Raul::Atom& value);
+
+	virtual void del(const Raul::URI& uri);
+
+	// ServerInterface object commands
+
+	virtual void disconnect_all(const Raul::Path& parent_patch_path,
+	                            const Raul::Path& path);
+
+	// Requests
+	virtual void ping();
+	virtual void get(const Raul::URI& uri);
+
+protected:
+	virtual void disable_responses();
+
+	SharedPtr<Request> _request; ///< NULL if responding disabled
+	Engine&            _engine;
+	bool               _in_bundle; ///< True iff a bundle is currently being received
+
+private:
+	SampleCount now() const;
+};
+
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_QUEUEDENGINEINTERFACE_HPP