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diff --git a/wsrep-lib/dbsim/db_storage_engine.hpp b/wsrep-lib/dbsim/db_storage_engine.hpp
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+++ b/wsrep-lib/dbsim/db_storage_engine.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_STORAGE_ENGINE_HPP
+#define WSREP_DB_STORAGE_ENGINE_HPP
+
+#include "db_params.hpp"
+
+#include "wsrep/mutex.hpp"
+#include "wsrep/view.hpp"
+#include "wsrep/transaction.hpp"
+
+#include <atomic>
+#include <unordered_set>
+#include <random>
+
+namespace db
+{
+    class client;
+    class storage_engine
+    {
+    public:
+        storage_engine(const params& params)
+            : mutex_()
+            , transactions_()
+            , alg_freq_(params.alg_freq)
+            , bf_aborts_()
+            , position_()
+            , view_()
+            , random_device_()
+            , random_engine_(random_device_())
+        { }
+
+        class transaction
+        {
+        public:
+            transaction(storage_engine& se)
+                : se_(se)
+                , cc_()
+            { }
+            ~transaction()
+            {
+                rollback();
+            }
+            bool active() const { return cc_ != nullptr; }
+            void start(client* cc);
+            void apply(const wsrep::transaction&);
+            void commit(const wsrep::gtid&);
+            void rollback();
+            db::client* client() { return cc_; }
+            transaction(const transaction&) = delete;
+            transaction& operator=(const transaction&) = delete;
+        private:
+            db::storage_engine& se_;
+            db::client* cc_;
+        };
+        void bf_abort_some(const wsrep::transaction& tc);
+        long long bf_aborts() const { return bf_aborts_; }
+        void store_position(const wsrep::gtid& gtid);
+        wsrep::gtid get_position() const;
+        void store_view(const wsrep::view& view);
+        wsrep::view get_view() const;
+    private:
+        void validate_position(const wsrep::gtid& gtid) const;
+        wsrep::default_mutex mutex_;
+        std::unordered_set<db::client*> transactions_;
+        size_t alg_freq_;
+        std::atomic<long long> bf_aborts_;
+        wsrep::gtid position_;
+        wsrep::view view_;
+        std::random_device random_device_;
+        std::default_random_engine random_engine_;
+    };
+}
+
+#endif // WSREP_DB_STORAGE_ENGINE_HPP