cursor_by_thread_connect_attr.h

/* Copyright (c) 2012, 2023, 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.

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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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  You should have received a copy of the GNU General Public License
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  51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */

#ifndef CURSOR_BY_THREAD_CONNECT_ATTR_H
#define CURSOR_BY_THREAD_CONNECT_ATTR_H

#include "pfs_column_types.h"
#include "pfs_engine_table.h"
#include "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(void)
  {
    m_index_1++;
    m_index_2= 0;
  }

  inline void reset(void)
  {
    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();

  virtual int rnd_next();
  virtual int rnd_pos(const void *pos);
  virtual void reset_position(void);

protected:
  cursor_by_thread_connect_attr(const PFS_engine_table_share *share);

public:
  ~cursor_by_thread_connect_attr()
  {}

protected:
  virtual void make_row(PFS_thread *thread, uint ordinal)= 0;
  /** True if row exists */
  bool m_row_exists;

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

/** @} */
#endif