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diff --git a/src/libs/engine/OSCResponder.hpp b/src/libs/engine/OSCResponder.hpp
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+++ b/src/libs/engine/OSCResponder.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 OSCRESPONDER_H
+#define OSCRESPONDER_H
+
+#include <inttypes.h>
+#include <memory>
+#include <lo/lo.h>
+#include "interface/Responder.hpp"
+
+namespace Ingen {
+
+class ClientBroadcaster;
+
+
+/** Responder for (liblo) OSC clients.
+ *
+ * OSC Clients use request IDs to be able to associate replies with sent
+ * events.  If the ID is -1, a response will not be sent (and the overhead
+ * of searching for the client's record will be skipped).  Any other integer
+ * is a valid response ID and will be responded to.
+ *
+ * Creation of the lo_address is deferred until needed to avoid bogging down
+ * the receiving thread as much as possible.
+ */
+class OSCResponder : public Shared::Responder
+{
+public:
+	OSCResponder(ClientBroadcaster* broadcaster, int32_t id, char* url);
+	~OSCResponder();
+	
+	void set_id(int32_t id) { _id = id; }
+
+	void respond_ok();
+	void respond_error(const std::string& msg);
+
+	const char* url() const { return _url; }
+
+	Shared::ClientKey client_key() 
+		{ return Shared::ClientKey(Shared::ClientKey::OSC_URL, _url); }
+	
+	SharedPtr<Shared::ClientInterface> client();
+
+private:
+	ClientBroadcaster* _broadcaster;
+	int32_t            _id;
+	char* const        _url;
+	lo_address         _addr;
+};
+
+
+} // namespace Ingen
+
+#endif // OSCRESPONDER_H
+