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diff --git a/storage/mroonga/lib/mrn_database_manager.hpp b/storage/mroonga/lib/mrn_database_manager.hpp
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+++ b/storage/mroonga/lib/mrn_database_manager.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2010 Tetsuro IKEDA
+  Copyright(C) 2010-2013 Kentoku SHIBA
+  Copyright(C) 2011-2014 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_DATABASE_MANAGER_HPP_
+#define MRN_DATABASE_MANAGER_HPP_
+
+#include "mrn_database.hpp"
+
+#include <groonga.h>
+
+namespace mrn {
+  class DatabaseManager {
+  public:
+    DatabaseManager(grn_ctx *ctx, mysql_mutex_t *mutex);
+    ~DatabaseManager(void);
+    bool init(void);
+    int open(const char *path, Database **db);
+    void close(const char *path);
+    bool drop(const char *path);
+    int clear(void);
+    const char *error_message();
+
+  private:
+    grn_ctx *ctx_;
+    grn_hash *cache_;
+    mysql_mutex_t *mutex_;
+
+    void mkdir_p(const char *directory);
+    void ensure_database_directory(void);
+    int ensure_normalizers_registered(grn_obj *db);
+  };
+}
+
+#endif /* MRN_DATABASE_MANAGER_HPP_ */