mariadb/storage/perfschema/table_mems_global_by_event_name.h

/* Copyright (c) 2011, 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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  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
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  permission to link the program and your derivative works with the
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  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,
  51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */

#ifndef TABLE_MEMORY_SUMMARY_GLOBAL_BY_EVENT_NAME_H
#define TABLE_MEMORY_SUMMARY_GLOBAL_BY_EVENT_NAME_H

/**
  @file storage/perfschema/table_mems_global_by_event_name.h
  Table MEMORY_SUMMARY_GLOBAL_BY_EVENT_NAME (declarations).
*/

#include "pfs_column_types.h"
#include "pfs_engine_table.h"
#include "pfs_instr_class.h"
#include "pfs_builtin_memory.h"
#include "table_helper.h"

/**
  @addtogroup Performance_schema_tables
  @{
*/

/** A row of PERFORMANCE_SCHEMA.MEMORY_SUMMARY_GLOBAL_BY_EVENT_NAME. */
struct row_mems_global_by_event_name
{
  /** Column EVENT_NAME. */
  PFS_event_name_row m_event_name;
  /** Columns COUNT_ALLOC, ... */
  PFS_memory_stat_row m_stat;
};

/**
  Position of a cursor on
  PERFORMANCE_SCHEMA.MEMORY_SUMMARY_GLOBAL_BY_EVENT_NAME.
  Index 1 on view
  Index 2 on instrument key (1 based)
*/
struct pos_mems_global_by_event_name : public PFS_double_index
{
  static const uint FIRST_VIEW= 1;
  static const uint VIEW_BUILTIN_MEMORY= 1;
  static const uint VIEW_MEMORY= 2;
  static const uint LAST_VIEW= 2;

  pos_mems_global_by_event_name()
    : PFS_double_index(FIRST_VIEW, 1)
  {}

  inline void reset(void)
  {
    m_index_1= FIRST_VIEW;
    m_index_2= 1;
  }

  inline bool has_more_view(void)
  { return (m_index_1 <= LAST_VIEW); }

  inline void next_view(void)
  {
    m_index_1++;
    m_index_2= 1;
  }
};

/** Table PERFORMANCE_SCHEMA.MEMORY_SUMMARY_GLOBAL_BY_EVENT_NAME. */
class table_mems_global_by_event_name : public PFS_engine_table
{
  typedef pos_mems_global_by_event_name pos_t;

public:
  static PFS_engine_table_share_state m_share_state;
  /** Table share */
  static PFS_engine_table_share m_share;
  static PFS_engine_table* create();
  static int delete_all_rows();
  static ha_rows get_row_count();

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

private:
  int read_row_values(TABLE *table,
                      unsigned char *buf,
                      Field **fields,
                      bool read_all) override;

  table_mems_global_by_event_name();

public:
  ~table_mems_global_by_event_name()
  {}

private:
  void make_row(PFS_builtin_memory_class *klass);
  void make_row(PFS_memory_class *klass);

  /** Table share lock. */
  static THR_LOCK m_table_lock;
  /** Fields definition. */
  static TABLE_FIELD_DEF m_field_def;

  /** Current row. */
  row_mems_global_by_event_name m_row;
  /** True is the current row exists. */
  bool m_row_exists;
  /** Current position. */
  pos_t m_pos;
  /** Next position. */
  pos_t m_next_pos;
};

/** @} */
#endif