/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef OCEANBASE_OBSERVER_OB_INNER_SQL_READ_CONTEXT_H_
#define OCEANBASE_OBSERVER_OB_INNER_SQL_READ_CONTEXT_H_

#include "lib/mysqlclient/ob_isql_result_handler.h"
#include "observer/virtual_table/ob_virtual_table_iterator_factory.h"
#include "ob_inner_sql_result.h"
#include "ob_inner_sql_connection.h"

namespace oceanbase
{
namespace sql
{
class ObResultSet;
}

namespace observer
{
class ObInnerSQLConnection;

class ObInnerSQLReadContext : public common::sqlclient::ObISQLResultHandler
{
public:
  explicit ObInnerSQLReadContext(ObInnerSQLConnection &conn);
  virtual ~ObInnerSQLReadContext();
  virtual common::sqlclient::ObMySQLResult *mysql_result() { return &result_; }
  ObInnerSQLResult &get_result() { return result_; }
  ObVirtualTableIteratorFactory &get_vt_iter_factory() { return vt_iter_factory_; }

private:
  // define order dependent:
  // %conn_ref_ (session info) need be destructed after %result_
  // %vt_iter_factory_ need be destructed after %result_
  ObInnerSQLConnection::RefGuard conn_ref_;
  ObVirtualTableIteratorFactory vt_iter_factory_;
  ObInnerSQLResult result_;

  DISALLOW_COPY_AND_ASSIGN(ObInnerSQLReadContext);
};

} // end of namespace observer
} // end of namespace oceanbase

#endif // OCEANBASE_OBSERVER_OB_INNER_SQL_READ_CONTEXT_H_