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diff --git a/wsrep-lib/dbsim/db_high_priority_service.hpp b/wsrep-lib/dbsim/db_high_priority_service.hpp
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+++ b/wsrep-lib/dbsim/db_high_priority_service.hpp
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+/*
+ * Copyright (C) 2018-2019 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_HIGH_PRIORITY_SERVICE_HPP
+#define WSREP_DB_HIGH_PRIORITY_SERVICE_HPP
+
+#include "wsrep/high_priority_service.hpp"
+
+namespace db
+{
+    class server;
+    class client;
+    class high_priority_service : public wsrep::high_priority_service
+    {
+    public:
+        high_priority_service(db::server& server, db::client& client);
+        int start_transaction(const wsrep::ws_handle&,
+                              const wsrep::ws_meta&) override;
+        int next_fragment(const wsrep::ws_meta&) override;
+        const wsrep::transaction& transaction() const override;
+        int adopt_transaction(const wsrep::transaction&) override;
+        int apply_write_set(const wsrep::ws_meta&,
+                            const wsrep::const_buffer&,
+                            wsrep::mutable_buffer&) override;
+        int append_fragment_and_commit(
+            const wsrep::ws_handle&,
+            const wsrep::ws_meta&,
+            const wsrep::const_buffer&,
+            const wsrep::xid&) override
+        { return 0; }
+        int remove_fragments(const wsrep::ws_meta&) override
+        { return 0; }
+        int commit(const wsrep::ws_handle&, const wsrep::ws_meta&) override;
+        int rollback(const wsrep::ws_handle&, const wsrep::ws_meta&) override;
+        int apply_toi(const wsrep::ws_meta&, const wsrep::const_buffer&,
+                      wsrep::mutable_buffer&) override;
+        int apply_nbo_begin(const wsrep::ws_meta&, const wsrep::const_buffer&,
+                            wsrep::mutable_buffer&)
+            override;
+        void adopt_apply_error(wsrep::mutable_buffer&) override;
+        virtual void after_apply() override;
+        void store_globals() override { }
+        void reset_globals() override { }
+        void switch_execution_context(wsrep::high_priority_service&) override
+        { }
+        int log_dummy_write_set(const wsrep::ws_handle&,
+                                const wsrep::ws_meta&,
+                                wsrep::mutable_buffer&) override;
+        virtual bool is_replaying() const override;
+        void debug_crash(const char*) override { }
+    private:
+        high_priority_service(const high_priority_service&);
+        high_priority_service& operator=(const high_priority_service&);
+        db::server& server_;
+        db::client& client_;
+    };
+
+    class replayer_service : public db::high_priority_service
+    {
+    public:
+        replayer_service(db::server& server, db::client& client)
+            : db::high_priority_service(server, client)
+        { }
+        // After apply is empty for replayer to keep the transaction
+        // context available for the client session after replaying
+        // is over.
+        void after_apply() override {}
+        bool is_replaying() const override { return true; }
+    };
+
+}
+
+#endif // WSREP_DB_HIGH_PRIORITY_SERVICE_HPP