polardbxengine/storage/perfschema/table_setup_threads.cc

/* Copyright (c) 2017, 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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  but not limited to OpenSSL) that is licensed under separate terms,
  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
  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_setup_threads.cc
  Table SETUP_THREADS (implementation).
*/

#include "storage/perfschema/table_setup_threads.h"

#include <stddef.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_column_types.h"
#include "storage/perfschema/pfs_column_values.h"
#include "storage/perfschema/pfs_global.h"
#include "storage/perfschema/pfs_instr_class.h"

THR_LOCK table_setup_threads::m_table_lock;

Plugin_table table_setup_threads::m_table_def(
    /* Schema name */
    "performance_schema",
    /* Name */
    "setup_threads",
    /* Definition */
    "  NAME VARCHAR(128) not null,\n"
    "  ENABLED ENUM ('YES', 'NO') not null,\n"
    "  HISTORY ENUM ('YES', 'NO') not null,\n"
    "  PROPERTIES SET('singleton', 'user') not null,\n"
    "  VOLATILITY int not null,\n"
    "  DOCUMENTATION LONGTEXT,\n"
    "  PRIMARY KEY (NAME) USING HASH\n",
    /* Options */
    " ENGINE=PERFORMANCE_SCHEMA",
    /* Tablespace */
    nullptr);

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

bool PFS_index_setup_threads::match(PFS_instr_class *klass) {
  if (m_fields >= 1) {
    return m_key.match(klass);
  }

  return true;
}

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

ha_rows table_setup_threads::get_row_count(void) { return thread_class_max; }

table_setup_threads::table_setup_threads()
    : PFS_engine_table(&m_share, &m_pos), m_pos(1), m_next_pos(1) {}

void table_setup_threads::reset_position(void) {
  m_pos.m_index = 1;
  m_next_pos.m_index = 1;
}

int table_setup_threads::rnd_next(void) {
  PFS_thread_class *instr_class = NULL;

  /* Do not advertise threads when disabled. */
  if (!pfs_initialized) {
    return HA_ERR_END_OF_FILE;
  }

  for (m_pos.set_at(&m_next_pos);; m_pos.next()) {
    instr_class = find_thread_class(m_pos.m_index);

    if (instr_class) {
      m_next_pos.set_after(&m_pos);
      return make_row(instr_class);
    }

    return HA_ERR_END_OF_FILE;
  }

  return HA_ERR_END_OF_FILE;
}

int table_setup_threads::rnd_pos(const void *pos) {
  PFS_thread_class *instr_class = NULL;

  /* Do not advertise threads when disabled. */
  if (!pfs_initialized) {
    return HA_ERR_END_OF_FILE;
  }

  set_position(pos);

  instr_class = find_thread_class(m_pos.m_index);

  if (instr_class) {
    return make_row(instr_class);
  }

  return HA_ERR_RECORD_DELETED;
}

int table_setup_threads::index_init(uint idx MY_ATTRIBUTE((unused)), bool) {
  PFS_index_setup_threads *result;

  DBUG_ASSERT(idx == 0);
  result = PFS_NEW(PFS_index_setup_threads);

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

int table_setup_threads::index_next(void) {
  PFS_thread_class *instr_class = NULL;

  /* Do not advertise threads when disabled. */
  if (!pfs_initialized) {
    return HA_ERR_END_OF_FILE;
  }

  for (m_pos.set_at(&m_next_pos);; m_pos.next()) {
    instr_class = find_thread_class(m_pos.m_index);

    if (instr_class) {
      if (m_opened_index->match(instr_class)) {
        if (!make_row(instr_class)) {
          m_next_pos.set_after(&m_pos);
          return 0;
        }
      }
    } else {
      return HA_ERR_END_OF_FILE;
    }
  }

  return HA_ERR_END_OF_FILE;
}

int table_setup_threads::make_row(PFS_thread_class *klass) {
  m_row.m_instr_class = klass;

  return 0;
}

int table_setup_threads::read_row_values(TABLE *table, unsigned char *buf,
                                         Field **fields, bool read_all) {
  Field *f;
  const char *doc;
  int properties;

  /* Set the null bits */
  DBUG_ASSERT(table->s->null_bytes == 1);
  buf[0] = 0;

  /*
    The row always exist, the instrument classes
    are static and never disappear.
  */

  for (; (f = *fields); fields++) {
    if (read_all || bitmap_is_set(table->read_set, f->field_index)) {
      switch (f->field_index) {
        case 0: /* NAME */
          set_field_varchar_utf8(f, m_row.m_instr_class->m_name,
                                 m_row.m_instr_class->m_name_length);
          break;
        case 1: /* ENABLED */
          set_field_enum(f,
                         m_row.m_instr_class->m_enabled ? ENUM_YES : ENUM_NO);
          break;
        case 2: /* HISTORY */
          set_field_enum(f,
                         m_row.m_instr_class->m_history ? ENUM_YES : ENUM_NO);
          break;
        case 3: /* PROPERTIES */
          properties = 0;
          if (m_row.m_instr_class->is_singleton()) {
            properties |= THREAD_PROPERTIES_SET_SINGLETON;
          }
          if (m_row.m_instr_class->is_user()) {
            properties |= THREAD_PROPERTIES_SET_USER;
          }
          set_field_set(f, properties);
          break;
        case 4: /* VOLATILITY */
          set_field_ulong(f, m_row.m_instr_class->m_volatility);
          break;
        case 5: /* DOCUMENTATION */
          doc = m_row.m_instr_class->m_documentation;
          if (doc != NULL) {
            set_field_blob(f, doc, strlen(doc));
          } else {
            f->set_null();
          }
          break;
        default:
          DBUG_ASSERT(false);
      }
    }
  }

  return 0;
}

int table_setup_threads::update_row_values(TABLE *table, const unsigned char *,
                                           unsigned char *, Field **fields) {
  Field *f;
  enum_yes_no value;

  for (; (f = *fields); fields++) {
    if (bitmap_is_set(table->write_set, f->field_index)) {
      switch (f->field_index) {
        case 0: /* NAME */
          return HA_ERR_WRONG_COMMAND;
        case 1: /* ENABLED */
          value = (enum_yes_no)get_field_enum(f);
          m_row.m_instr_class->m_enabled = (value == ENUM_YES) ? true : false;
          break;
        case 2: /* HISTORY */
          value = (enum_yes_no)get_field_enum(f);
          m_row.m_instr_class->m_history = (value == ENUM_YES) ? true : false;
          break;
        case 3: /* PROPERTIES */
        case 4: /* VOLATILITY */
        case 5: /* DOCUMENTATION */
          return HA_ERR_WRONG_COMMAND;
        default:
          DBUG_ASSERT(false);
      }
    }
  }

  /* No derived flag to update. */

  return 0;
}