table_file_instances.h

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  it under the terms of the GNU General Public License, version 2.0,
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#ifndef TABLE_FILE_INSTANCES_H
#define TABLE_FILE_INSTANCES_H
 
/**
  @file storage/perfschema/table_file_instances.h
  Table FILE_INSTANCES (declarations).
*/
 
#include <sys/types.h>
 
#include "my_base.h"
#include "storage/perfschema/pfs_engine_table.h"
#include "storage/perfschema/table_helper.h"
 
class Field;
class Plugin_table;
struct PFS_file;
struct TABLE;
struct THR_LOCK;
 
/**
  @addtogroup performance_schema_tables
  @{
*/
 
/** A row of PERFORMANCE_SCHEMA.FILE_INSTANCES. */
struct row_file_instances {
  /** Column FILE_NAME. */
  PFS_file_name m_file_name;
  /** Column EVENT_NAME. */
  const char *m_event_name{nullptr};
  /** Length in bytes of @c m_event_name. */
  uint m_event_name_length{0};
  /** Column OPEN_COUNT. */
  uint m_open_count{0};
};
 
class PFS_index_file_instances : public PFS_engine_index {
 public:
  explicit PFS_index_file_instances(PFS_engine_key *key_1)
      : PFS_engine_index(key_1) {}
 
  ~PFS_index_file_instances() override = default;
 
  virtual bool match(const PFS_file *pfs) = 0;
};
 
class PFS_index_file_instances_by_file_name : public PFS_index_file_instances {
 public:
  PFS_index_file_instances_by_file_name()
      : PFS_index_file_instances(&m_key), m_key("FILE_NAME") {}
 
  ~PFS_index_file_instances_by_file_name() override = default;
 
  bool match(const PFS_file *pfs) override;
 
 private:
  PFS_key_file_name m_key;
};
 
class PFS_index_file_instances_by_event_name : public PFS_index_file_instances {
 public:
  PFS_index_file_instances_by_event_name()
      : PFS_index_file_instances(&m_key), m_key("EVENT_NAME") {}
 
  ~PFS_index_file_instances_by_event_name() override = default;
 
  bool match(const PFS_file *pfs) override;
 
 private:
  PFS_key_event_name m_key;
};
 
/** Table PERFORMANCE_SCHEMA.FILE_INSTANCES. */
class table_file_instances : public PFS_engine_table {
 public:
  /** 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;
 
  int index_init(uint idx, bool sorted) override;
  int index_next() override;
 
 private:
  int read_row_values(TABLE *table, unsigned char *buf, Field **fields,
                      bool read_all) override;
  table_file_instances();
 
 public:
  ~table_file_instances() override = default;
 
 private:
  int make_row(PFS_file *pfs);
 
  /** Table share lock. */
  static THR_LOCK m_table_lock;
  /** Table definition. */
  static Plugin_table m_table_def;
 
  /** Current row. */
  row_file_instances m_row;
  /** Current position. */
  PFS_simple_index m_pos;
  /** Next position. */
  PFS_simple_index m_next_pos;
 
  PFS_index_file_instances *m_opened_index;
};
 
/** @} */
#endif