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diff --git a/storage/mroonga/lib/mrn_operations.hpp b/storage/mroonga/lib/mrn_operations.hpp
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+++ b/storage/mroonga/lib/mrn_operations.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2015 Kouhei Sutou <kou@clear-code.com>
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
+*/
+
+#ifndef MRN_OPERATIONS_HPP_
+#define MRN_OPERATIONS_HPP_
+
+#include <groonga.h>
+
+namespace mrn {
+  class Operations {
+  public:
+    Operations(grn_ctx *ctx);
+    ~Operations();
+
+    bool is_locked();
+
+    grn_id start(const char *type,
+                 const char *table_name, size_t table_name_size);
+    void record_target(grn_id id, grn_id target_id);
+    void finish(grn_id id);
+
+    void enable_recording();
+    void disable_recording();
+
+    grn_hash *collect_processing_table_names();
+
+    int repair(const char *table_name, size_t table_name_size);
+    int clear(const char *table_name, size_t table_name_size);
+
+  private:
+    grn_ctx *ctx_;
+    grn_obj text_buffer_;
+    grn_obj id_buffer_;
+    grn_obj *table_;
+    struct {
+      grn_obj *type_;
+      grn_obj *table_;
+      grn_obj *record_;
+    } columns_;
+    bool is_enabled_recording_;
+  };
+}
+
+#endif /* MRN_OPERATIONS_HPP_ */