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diff --git a/wsrep-lib/dbsim/db_simulator.hpp b/wsrep-lib/dbsim/db_simulator.hpp
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+++ b/wsrep-lib/dbsim/db_simulator.hpp
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+/*
+ * Copyright (C) 2018 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-lib.
+ *
+ * Wsrep-lib 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.
+ *
+ * Wsrep-lib 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 more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-lib.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef WSREP_DB_SIMULATOR_HPP
+#define WSREP_DB_SIMULATOR_HPP
+
+#include "wsrep/gtid.hpp"
+#include "wsrep/mutex.hpp"
+#include "wsrep/lock.hpp"
+
+#include "db_params.hpp"
+#include "db_server.hpp"
+
+#include <memory>
+#include <chrono>
+#include <unordered_set>
+#include <map>
+
+namespace db
+{
+    class server;
+    class simulator
+    {
+    public:
+        simulator(const params& params)
+            : mutex_()
+            , params_(params)
+            , servers_()
+            , clients_start_()
+            , clients_stop_()
+            , stats_()
+        { }
+
+        void run();
+        void sst(db::server&,
+                 const std::string&, const wsrep::gtid&, bool);
+        const db::params& params() const
+        { return params_; }
+        std::string stats() const;
+    private:
+        void start();
+        void stop();
+        std::string server_port(size_t i) const;
+        std::string build_cluster_address() const;
+
+        wsrep::default_mutex mutex_;
+        const db::params& params_;
+        std::map<std::string, std::unique_ptr<db::server>> servers_;
+        std::chrono::time_point<std::chrono::steady_clock> clients_start_;
+        std::chrono::time_point<std::chrono::steady_clock> clients_stop_;
+    public:
+        struct stats
+        {
+            long long commits;
+            long long rollbacks;
+            long long replays;
+            stats()
+                : commits(0)
+                , rollbacks(0)
+                , replays(0)
+            { }
+        } stats_;
+    };
+}
+#endif // WSRE_DB_SIMULATOR_HPP