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diff --git a/sql/wsrep_client_service.h b/sql/wsrep_client_service.h
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+/* Copyright 2018 Codership Oy <info@codership.com>
+
+   This program 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; version 2 of the License.
+
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+/** @file wsrep_client_service.h
+
+  This file provides declaratios for client service implementation.
+  See wsrep/client_service.hpp for interface documentation.
+*/
+
+#ifndef WSREP_CLIENT_SERVICE_H
+#define WSREP_CLIENT_SERVICE_H
+
+/* wsrep-lib */
+#include "wsrep/client_service.hpp"
+#include "wsrep/client_state.hpp"
+#include "wsrep/exception.hpp" /* not_implemented_error, remove when finished */
+
+class THD;
+class Wsrep_client_state;
+class Wsrep_high_priority_context;
+
+class Wsrep_client_service : public wsrep::client_service
+{
+public:
+  Wsrep_client_service(THD*, Wsrep_client_state&);
+
+  bool interrupted(wsrep::unique_lock<wsrep::mutex>&) const;
+  void reset_globals();
+  void store_globals();
+  int prepare_data_for_replication();
+  void cleanup_transaction();
+  bool statement_allowed_for_streaming() const;
+  size_t bytes_generated() const;
+  int prepare_fragment_for_replication(wsrep::mutable_buffer&, size_t&);
+  int remove_fragments();
+  void emergency_shutdown()
+  { throw wsrep::not_implemented_error(); }
+  void will_replay();
+  void signal_replayed();
+  enum wsrep::provider::status replay();
+  enum wsrep::provider::status replay_unordered();
+  void wait_for_replayers(wsrep::unique_lock<wsrep::mutex>&);
+  enum wsrep::provider::status commit_by_xid();
+  bool is_explicit_xa()
+  {
+    return false;
+  }
+  bool is_xa_rollback()
+  {
+    return false;
+  }
+  void debug_sync(const char*);
+  void debug_crash(const char*);
+  int bf_rollback();
+private:
+  friend class Wsrep_server_service;
+  THD* m_thd;
+  Wsrep_client_state& m_client_state;
+};
+
+
+#endif /* WSREP_CLIENT_SERVICE_H */