cursor_by_thread_connect_attr.h

/* Copyright (c) 2012, 2025, Oracle and/or its affiliates.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.

  This program is designed to work with certain software (including
  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
  separately licensed software that they have either included with
  the program or referenced in the documentation.

  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, version 2.0, 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 */

#ifndef CURSOR_BY_THREAD_CONNECT_ATTR_H
#define CURSOR_BY_THREAD_CONNECT_ATTR_H

/**
  @file storage/perfschema/cursor_by_thread_connect_attr.h
*/

#include <sys/types.h>

#include "storage/perfschema/pfs_column_types.h"
#include "storage/perfschema/pfs_engine_table.h"
#include "storage/perfschema/pfs_instr.h"

/**
  @addtogroup performance_schema_tables
  @{
*/

/**
  Position of a cursor on abstract table
  PERFORMANCE_SCHEMA.SESSION_CONNECT_ATTRS.
*/
struct pos_connect_attr_by_thread_by_attr : public PFS_double_index {
  pos_connect_attr_by_thread_by_attr() : PFS_double_index(0, 0) {}

  inline void next_thread() {
    m_index_1++;
    m_index_2 = 0;
  }

  inline void reset() {
    m_index_1 = 0;
    m_index_2 = 0;
  }
};

/** Cursor CURSOR_BY_THREAD_CONNECT_ATTR. */
class cursor_by_thread_connect_attr : public PFS_engine_table {
 public:
  static ha_rows get_row_count();

  void reset_position() override;

  int rnd_next() override;
  int rnd_pos(const void *pos) override;

  int index_init(uint, bool) override { return 1; }
  int index_next() override { return 1; }

 protected:
  explicit cursor_by_thread_connect_attr(const PFS_engine_table_share *share);

 public:
  ~cursor_by_thread_connect_attr() override = default;

 protected:
  virtual int make_row(PFS_thread *thread, uint ordinal) = 0;

  /** Current position. */
  pos_connect_attr_by_thread_by_attr m_pos;
  /** Next position. */
  pos_connect_attr_by_thread_by_attr m_next_pos;
};

/** @} */
#endif