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+/*
+  This file is part of Ingen.
+  Copyright 2007-2016 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_ENGINE_TEE_HPP
+#define INGEN_ENGINE_TEE_HPP
+
+#include <mutex>
+#include <set>
+#include <string>
+
+#include "ingen/Interface.hpp"
+#include "ingen/types.hpp"
+
+namespace Ingen {
+
+/** Interface that forwards all calls to several sinks. */
+class Tee : public Interface
+{
+public:
+	typedef std::set< SPtr<Interface> > Sinks;
+
+	Tee(const Sinks& sinks = {})
+		: _sinks(sinks)
+	{}
+
+	void add_sink(SPtr<Interface> sink) {
+		std::lock_guard<std::mutex> lock(_sinks_mutex);
+		_sinks.insert(sink);
+	}
+
+	bool remove_sink(SPtr<Interface> sink) {
+		std::lock_guard<std::mutex> lock(_sinks_mutex);
+		return (_sinks.erase(sink) > 0);
+	}
+
+	virtual SPtr<Interface> respondee() const {
+		return (*_sinks.begin())->respondee();
+	}
+
+	virtual void set_respondee(SPtr<Interface> respondee) {
+		(*_sinks.begin())->set_respondee(respondee);
+	}
+
+#define BROADCAST(msg, ...) \
+	std::lock_guard<std::mutex> lock(_sinks_mutex); \
+	for (const auto& s : _sinks) { \
+		s->msg(__VA_ARGS__); \
+	}
+
+	void bundle_begin() { BROADCAST(bundle_begin); }
+	void bundle_end()   { BROADCAST(bundle_end); }
+
+	void put(const Raul::URI&            uri,
+	         const Resource::Properties& properties,
+	         Resource::Graph             ctx=Resource::Graph::DEFAULT) {
+		BROADCAST(put, uri, properties);
+	}
+
+	void delta(const Raul::URI&            uri,
+	           const Resource::Properties& remove,
+	           const Resource::Properties& add) {
+		BROADCAST(delta, uri, remove, add);
+	}
+
+	void copy(const Raul::URI& old_uri,
+	          const Raul::URI& new_uri) {
+		BROADCAST(copy, old_uri, new_uri);
+	}
+
+	void move(const Raul::Path& old_path,
+	          const Raul::Path& new_path) {
+		BROADCAST(move, old_path, new_path);
+	}
+
+	void del(const Raul::URI& uri) { BROADCAST(del, uri); }
+
+	void connect(const Raul::Path& tail,
+	             const Raul::Path& head) {
+		BROADCAST(connect, tail, head);
+	}
+
+	void disconnect(const Raul::Path& tail,
+	                const Raul::Path& head) {
+		BROADCAST(disconnect, tail, head);
+	}
+
+	void disconnect_all(const Raul::Path& graph,
+	                    const Raul::Path& path) {
+		BROADCAST(disconnect_all, graph, path);
+	}
+
+	void set_property(const Raul::URI& subject,
+	                  const Raul::URI& predicate,
+	                  const Atom&      value) {
+		BROADCAST(set_property, subject, predicate, value);
+	}
+
+	void undo() { BROADCAST(undo); }
+	void redo() { BROADCAST(redo); }
+
+	void set_response_id(int32_t id) { BROADCAST(set_response_id, id); }
+
+	void get(const Raul::URI& uri) { BROADCAST(get, uri); }
+
+	void response(int32_t id, Status status, const std::string& subject) {
+		BROADCAST(response, id, status, subject);
+	}
+
+	void error(const std::string& msg) { BROADCAST(error, msg); }
+
+#undef BROADCAST
+
+	Raul::URI    uri()   const { return Raul::URI("ingen:/tee"); }
+	const Sinks& sinks() const { return _sinks; }
+	Sinks&       sinks()       { return _sinks; }
+
+private:
+	std::mutex _sinks_mutex;
+	Sinks      _sinks;
+};
+
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_TEE_HPP