polardbxengine/storage/perfschema/table_file_instances.cc

/* Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.

  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
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  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 */

/**
  @file storage/perfschema/table_file_instances.cc
  Table FILE_INSTANCES (implementation).
*/

#include "storage/perfschema/table_file_instances.h"

#include <stddef.h>

#include "my_compiler.h"
#include "my_dbug.h"
#include "my_thread.h"
#include "sql/field.h"
#include "sql/plugin_table.h"
#include "sql/table.h"
#include "storage/perfschema/pfs_buffer_container.h"
#include "storage/perfschema/pfs_column_types.h"
#include "storage/perfschema/pfs_column_values.h"
#include "storage/perfschema/pfs_global.h"
#include "storage/perfschema/pfs_instr.h"

THR_LOCK table_file_instances::m_table_lock;

Plugin_table table_file_instances::m_table_def(
    /* Schema name */
    "performance_schema",
    /* Name */
    "file_instances",
    /* Definition */
    "  FILE_NAME VARCHAR(512) not null,\n"
    "  EVENT_NAME VARCHAR(128) not null,\n"
    "  OPEN_COUNT INTEGER unsigned not null,\n"
    "  PRIMARY KEY (FILE_NAME) USING HASH,\n"
    "  KEY (EVENT_NAME) USING HASH\n",
    /* Options */
    " ENGINE=PERFORMANCE_SCHEMA",
    /* Tablespace */
    nullptr);

PFS_engine_table_share table_file_instances::m_share = {
    &pfs_readonly_acl,
    table_file_instances::create,
    NULL, /* write_row */
    NULL, /* delete_all_rows */
    table_file_instances::get_row_count,
    sizeof(PFS_simple_index),
    &m_table_lock,
    &m_table_def,
    false, /* perpetual */
    PFS_engine_table_proxy(),
    {0},
    false /* m_in_purgatory */
};

bool PFS_index_file_instances_by_file_name::match(const PFS_file *pfs) {
  if (m_fields >= 1) {
    if (!m_key.match(pfs)) {
      return false;
    }
  }
  return true;
}

bool PFS_index_file_instances_by_event_name::match(const PFS_file *pfs) {
  if (m_fields >= 1) {
    if (!m_key.match(pfs)) {
      return false;
    }
  }
  return true;
}

PFS_engine_table *table_file_instances::create(PFS_engine_table_share *) {
  return new table_file_instances();
}

ha_rows table_file_instances::get_row_count(void) {
  return global_file_container.get_row_count();
}

table_file_instances::table_file_instances()
    : PFS_engine_table(&m_share, &m_pos), m_pos(0), m_next_pos(0) {}

void table_file_instances::reset_position(void) {
  m_pos.m_index = 0;
  m_next_pos.m_index = 0;
}

int table_file_instances::rnd_next(void) {
  PFS_file *pfs;

  m_pos.set_at(&m_next_pos);
  PFS_file_iterator it = global_file_container.iterate(m_pos.m_index);
  pfs = it.scan_next(&m_pos.m_index);
  if (pfs != NULL) {
    m_next_pos.set_after(&m_pos);
    return make_row(pfs);
  }

  return HA_ERR_END_OF_FILE;
}

int table_file_instances::rnd_pos(const void *pos) {
  PFS_file *pfs;

  set_position(pos);

  pfs = global_file_container.get(m_pos.m_index);
  if (pfs != NULL) {
    return make_row(pfs);
  }

  return HA_ERR_RECORD_DELETED;
}

int table_file_instances::index_init(uint idx, bool) {
  PFS_index_file_instances *result = NULL;

  switch (idx) {
    case 0:
      result = PFS_NEW(PFS_index_file_instances_by_file_name);
      break;
    case 1:
      result = PFS_NEW(PFS_index_file_instances_by_event_name);
      break;
    default:
      DBUG_ASSERT(false);
      break;
  }

  m_opened_index = result;
  m_index = result;
  return 0;
}

int table_file_instances::index_next(void) {
  PFS_file *pfs;

  m_pos.set_at(&m_next_pos);
  PFS_file_iterator it = global_file_container.iterate(m_pos.m_index);

  do {
    pfs = it.scan_next(&m_pos.m_index);
    if (pfs != NULL) {
      if (m_opened_index->match(pfs)) {
        if (!make_row(pfs)) {
          m_next_pos.set_after(&m_pos);
          return 0;
        }
      }
    }
  } while (pfs != NULL);

  return HA_ERR_END_OF_FILE;
}

int table_file_instances::make_row(PFS_file *pfs) {
  pfs_optimistic_state lock;
  PFS_file_class *safe_class;

  /* Protect this reader against a file delete */
  pfs->m_lock.begin_optimistic_lock(&lock);

  safe_class = sanitize_file_class(pfs->m_class);
  if (unlikely(safe_class == NULL)) {
    return HA_ERR_RECORD_DELETED;
  }

  m_row.m_filename = pfs->m_filename;
  m_row.m_filename_length = pfs->m_filename_length;
  m_row.m_event_name = safe_class->m_name;
  m_row.m_event_name_length = safe_class->m_name_length;
  m_row.m_open_count = pfs->m_file_stat.m_open_count;

  if (!pfs->m_lock.end_optimistic_lock(&lock)) {
    return HA_ERR_RECORD_DELETED;
  }

  return 0;
}

int table_file_instances::read_row_values(TABLE *table, unsigned char *,
                                          Field **fields, bool read_all) {
  Field *f;

  /* Set the null bits */
  DBUG_ASSERT(table->s->null_bytes == 0);

  for (; (f = *fields); fields++) {
    if (read_all || bitmap_is_set(table->read_set, f->field_index)) {
      switch (f->field_index) {
        case 0: /* FILENAME */
          set_field_varchar_utf8(f, m_row.m_filename, m_row.m_filename_length);
          break;
        case 1: /* EVENT_NAME */
          set_field_varchar_utf8(f, m_row.m_event_name,
                                 m_row.m_event_name_length);
          break;
        case 2: /* OPEN_COUNT */
          set_field_ulong(f, m_row.m_open_count);
          break;
        default:
          DBUG_ASSERT(false);
      }
    }
  }

  return 0;
}