table_log_status.h

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/* Copyright (c) 2017, 2024, 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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   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
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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
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef TABLE_LOG_STATUS_H
#define TABLE_LOG_STATUS_H
 
/**
  @file storage/perfschema/table_log_status.h
  Table log_status (declarations).
*/
 
#include "sql-common/json_dom.h"
#include "sql/sql_const.h"
#include "storage/perfschema/pfs_column_types.h"
#include "storage/perfschema/pfs_engine_table.h"
 
/*
  A row in the table. The fields with string values have an additional
  length field denoted by <field_name>_length.
*/
struct st_row_log_status {
  char server_uuid[UUID_LENGTH];
  Json_wrapper w_local;
  Json_wrapper w_replication;
  Json_wrapper w_storage_engines;
 
  st_row_log_status() = default;
 
  void cleanup() {}
};
 
/** Table PERFORMANCE_SCHEMA.LOG_STATUS. */
class table_log_status : public PFS_engine_table {
 private:
  int make_row();
 
  /** Table share lock. */
  static THR_LOCK m_table_lock;
  /** Table definition. */
  static Plugin_table m_table_def;
 
  /** Current row */
  st_row_log_status m_row;
  /** Current position. */
  PFS_simple_index m_pos;
  /** Next position. */
  PFS_simple_index m_next_pos;
 
 protected:
  /**
    Read the current row values.
    @param table            Table handle
    @param buf              row buffer
    @param fields           Table fields
    @param read_all         true if all columns are read.
  */
 
  int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
                      bool read_all) override;
 
  table_log_status();
 
 public:
  ~table_log_status() override;
 
  /** Table share. */
  static PFS_engine_table_share m_share;
  static PFS_engine_table *create(PFS_engine_table_share *);
  static ha_rows get_row_count();
  void reset_position() override;
 
  int rnd_next() override;
  int rnd_pos(const void *pos) override;
};
 
#endif