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diff --git a/src/Reactor.hpp b/src/Reactor.hpp
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+/* This file is part of Patchage.
+ * Copyright 2007-2021 David Robillard <d@drobilla.net>
+ *
+ * Patchage 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.
+ *
+ * Patchage 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 Patchage.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef PATCHAGE_REACTOR_HPP
+#define PATCHAGE_REACTOR_HPP
+
+#include "Action.hpp"
+#include "ClientID.hpp"
+#include "PortID.hpp"
+#include "SignalDirection.hpp"
+
+#include <unordered_map>
+
+namespace patchage {
+
+class CanvasModule;
+class CanvasPort;
+class Driver;
+class ILog;
+class Patchage;
+
+/// Reacts to actions from the user
+class Reactor
+{
+public:
+  using result_type = void; ///< For boost::apply_visitor
+
+  explicit Reactor(Patchage& patchage);
+
+  Reactor(const Reactor&) = delete;
+  Reactor& operator=(const Reactor&) = delete;
+
+  Reactor(Reactor&&) = delete;
+  Reactor& operator=(Reactor&&) = delete;
+
+  ~Reactor() = default;
+
+  void add_driver(PortID::Type type, Driver* driver);
+
+  void operator()(const action::ConnectPorts& action);
+  void operator()(const action::DisconnectClient& action);
+  void operator()(const action::DisconnectPort& action);
+  void operator()(const action::DisconnectPorts& action);
+  void operator()(const action::MoveModule& action);
+  void operator()(const action::SplitModule& action);
+  void operator()(const action::UnsplitModule& action);
+
+  void operator()(const Action& action);
+
+private:
+  CanvasModule* find_module(const ClientID& client, SignalDirection type);
+  CanvasPort*   find_port(const PortID& port);
+
+  Patchage&                                 _patchage;
+  ILog&                                     _log;
+  std::unordered_map<PortID::Type, Driver*> _drivers;
+};
+
+} // namespace patchage
+
+#endif // PATCHAGE_REACTOR_HPP