/* Copyright (c) 2010, 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.

  This program is also distributed with certain software (including
  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
  separately licensed software that they have included with MySQL.

  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 Street, Suite 500, Boston, MA 02110-1335 USA */

/**
  @file storage/perfschema/table_esms_by_program.cc
  Table EVENTS_STATEMENTS_SUMMARY_BY_PROGRAM (implementation).
*/

#include "my_global.h"
#include "my_thread.h"
#include "pfs_instr_class.h"
#include "pfs_column_types.h"
#include "pfs_column_values.h"
#include "pfs_global.h"
#include "pfs_instr.h"
#include "pfs_timer.h"
#include "pfs_visitor.h"
#include "pfs_program.h"
#include "table_esms_by_program.h"
#include "pfs_buffer_container.h"
#include "field.h"

THR_LOCK table_esms_by_program::m_table_lock;

PFS_engine_table_share_state
table_esms_by_program::m_share_state = {
  false /* m_checked */
};

PFS_engine_table_share
table_esms_by_program::m_share=
{
  { C_STRING_WITH_LEN("events_statements_summary_by_program") },
  &pfs_truncatable_acl,
  table_esms_by_program::create,
  NULL, /* write_row */
  table_esms_by_program::delete_all_rows,
  table_esms_by_program::get_row_count,
  sizeof(PFS_simple_index),
  &m_table_lock,
  { C_STRING_WITH_LEN("CREATE TABLE events_statements_summary_by_program ("
                      "OBJECT_TYPE enum('EVENT', 'FUNCTION', 'PROCEDURE', 'TABLE', 'TRIGGER') comment 'Object type for which the summary is generated.',"
                      "OBJECT_SCHEMA varchar(64) NOT NULL comment 'The schema of the object for which the summary is generated.',"
                      "OBJECT_NAME varchar(64) NOT NULL comment 'The name of the object for which the summary is generated.',"
                      "COUNT_STAR bigint(20) unsigned NOT NULL comment 'The number of summarized events (from events_statements_current). This value includes all events, whether timed or nontimed.',"
                      "SUM_TIMER_WAIT bigint(20) unsigned NOT NULL comment 'The total wait time of the summarized timed events. This value is calculated only for timed events because nontimed events have a wait time of NULL. The same is true for the other xxx_TIMER_WAIT values.',"
                      "MIN_TIMER_WAIT bigint(20) unsigned NOT NULL comment 'The minimum wait time of the summarized timed events.',"
                      "AVG_TIMER_WAIT bigint(20) unsigned NOT NULL comment 'The average wait time of the summarized timed events.',"
                      "MAX_TIMER_WAIT bigint(20) unsigned NOT NULL comment 'The maximum wait time of the summarized timed events.',"
                      "COUNT_STATEMENTS bigint(20) unsigned NOT NULL comment 'Total number of nested statements invoked during stored program execution.',"
                      "SUM_STATEMENTS_WAIT bigint(20) unsigned NOT NULL comment 'The total wait time of the summarized timed statements. This value is calculated only for timed statements because nontimed statements have a wait time of NULL. The same is true for the other xxx_STATEMENT_WAIT values.',"
                      "MIN_STATEMENTS_WAIT bigint(20) unsigned NOT NULL comment 'The minimum wait time of the summarized timed statements.',"
                      "AVG_STATEMENTS_WAIT bigint(20) unsigned NOT NULL comment 'The average wait time of the summarized timed statements.',"
                      "MAX_STATEMENTS_WAIT bigint(20) unsigned NOT NULL comment 'The maximum wait time of the summarized timed statements.',"
                      "SUM_LOCK_TIME bigint(20) unsigned NOT NULL comment 'The total time spent (in picoseconds) waiting for table locks for the summarized statements.',"
                      "SUM_ERRORS bigint(20) unsigned NOT NULL comment 'The total number of errors that occurend for the summarized statements.',"
                      "SUM_WARNINGS bigint(20) unsigned NOT NULL comment 'The total number of warnings that occurend for the summarized statements.',"
                      "SUM_ROWS_AFFECTED bigint(20) unsigned NOT NULL comment 'The total number of affected rows by the summarized statements.',"
                      "SUM_ROWS_SENT bigint(20) unsigned NOT NULL comment 'The total number of rows returned by the summarized statements.',"
                      "SUM_ROWS_EXAMINED bigint(20) unsigned NOT NULL comment 'The total number of rows examined by the summarized statements.',"
                      "SUM_CREATED_TMP_DISK_TABLES bigint(20) unsigned NOT NULL comment 'The total number of on-disk temporary tables created by the summarized statements.',"
                      "SUM_CREATED_TMP_TABLES bigint(20) unsigned NOT NULL comment 'The total number of in-memory temporary tables created by the summarized statements.',"
                      "SUM_SELECT_FULL_JOIN bigint(20) unsigned NOT NULL comment 'The total number of full joins executed by the summarized statements.',"
                      "SUM_SELECT_FULL_RANGE_JOIN bigint(20) unsigned NOT NULL comment 'The total number of range search joins executed by the summarized statements.',"
                      "SUM_SELECT_RANGE bigint(20) unsigned NOT NULL comment 'The total number of joins that used ranges on the first table executed by the summarized statements.',"
                      "SUM_SELECT_RANGE_CHECK bigint(20) unsigned NOT NULL comment 'The total number of joins that check for key usage after each row executed by the summarized statements.',"
                      "SUM_SELECT_SCAN bigint(20) unsigned NOT NULL comment 'The total number of joins that did a full scan of the first table executed by the summarized statements.',"
                      "SUM_SORT_MERGE_PASSES bigint(20) unsigned NOT NULL comment 'The total number of merge passes that the sort algorithm has had to do for the summarized statements.',"
                      "SUM_SORT_RANGE bigint(20) unsigned NOT NULL comment 'The total number of sorts that were done using ranges for the summarized statements.',"
                      "SUM_SORT_ROWS bigint(20) unsigned NOT NULL comment 'The total number of sorted rows that were sorted by the summarized statements.',"
                      "SUM_SORT_SCAN bigint(20) unsigned NOT NULL comment 'The total number of sorts that were done by scanning the table by the summarized statements.',"
                      "SUM_NO_INDEX_USED bigint(20) unsigned NOT NULL comment 'The total number of statements that performed a table scan without using an index.',"
                      "SUM_NO_GOOD_INDEX_USED bigint(20) unsigned NOT NULL comment 'The total number of statements where no good index was found.')")},
  false, /* m_perpetual */
  false, /* m_optional */
  &m_share_state
};

PFS_engine_table*
table_esms_by_program::create(void)
{
  return new table_esms_by_program();
}

int
table_esms_by_program::delete_all_rows(void)
{
  reset_esms_by_program();
  return 0;
}

ha_rows
table_esms_by_program::get_row_count(void)
{
  return global_program_container.get_row_count();
}

table_esms_by_program::table_esms_by_program()
  : PFS_engine_table(&m_share, &m_pos),
    m_row_exists(false), m_pos(0), m_next_pos(0)
{}

void table_esms_by_program::reset_position(void)
{
  m_pos= 0;
  m_next_pos= 0;
}

int table_esms_by_program::rnd_next(void)
{
  PFS_program* pfs;

  m_pos.set_at(&m_next_pos);
  PFS_program_iterator it= global_program_container.iterate(m_pos.m_index);
  pfs= it.scan_next(& m_pos.m_index);
  if (pfs != NULL)
  {
    make_row(pfs);
    m_next_pos.set_after(&m_pos);
    return 0;
  }

  return HA_ERR_END_OF_FILE;
}

int
table_esms_by_program::rnd_pos(const void *pos)
{
  PFS_program* pfs;

  set_position(pos);

  pfs= global_program_container.get(m_pos.m_index);
  if (pfs != NULL)
  {
    make_row(pfs);
    return 0;
  }

  return HA_ERR_RECORD_DELETED;
}


void table_esms_by_program::make_row(PFS_program* program)
{
  pfs_optimistic_state lock;
  m_row_exists= false;

  program->m_lock.begin_optimistic_lock(&lock);

  m_row.m_object_type= program->m_type;

  m_row.m_object_name_length= program->m_object_name_length;
  if(m_row.m_object_name_length > 0)
    memcpy(m_row.m_object_name, program->m_object_name,
           m_row.m_object_name_length);

  m_row.m_schema_name_length= program->m_schema_name_length;
  if(m_row.m_schema_name_length > 0)
    memcpy(m_row.m_schema_name, program->m_schema_name,
           m_row.m_schema_name_length);

  time_normalizer *normalizer= time_normalizer::get(statement_timer);
  /* Get stored program's over all stats. */
  m_row.m_sp_stat.set(normalizer, &program->m_sp_stat);
  /* Get sub statements' stats. */
  m_row.m_stmt_stat.set(normalizer, & program->m_stmt_stat);

  if (! program->m_lock.end_optimistic_lock(&lock))
    return;

  m_row_exists= true;
}

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

  if (unlikely(! m_row_exists))
    return HA_ERR_RECORD_DELETED;

  /*
    Set the null bits. It indicates how many fields could be null
    in the table.
  */
  assert(table->s->null_bytes == 1);
  buf[0]= 0;

  for (; (f= *fields) ; fields++)
  {
    if (read_all || bitmap_is_set(table->read_set, f->field_index))
    {
      switch(f->field_index)
      {
      case 0: /* OBJECT_TYPE */
        if(m_row.m_object_type != 0)
          set_field_enum(f, m_row.m_object_type);
        else
          f->set_null();
        break;
      case 1: /* OBJECT_SCHEMA */
        if(m_row.m_schema_name_length > 0)
          set_field_varchar_utf8(f, m_row.m_schema_name,
                                 m_row.m_schema_name_length);
        else
          f->set_null();
        break;
      case 2: /* OBJECT_NAME */
        if(m_row.m_object_name_length > 0)
          set_field_varchar_utf8(f, m_row.m_object_name,
                                 m_row.m_object_name_length);
        else
          f->set_null();
        break;
      case 3: /* COUNT_STAR */
      case 4: /* SUM_TIMER_WAIT */
      case 5: /* MIN_TIMER_WAIT */
      case 6: /* AVG_TIMER_WAIT */
      case 7: /* MAX_TIMER_WAIT */
        m_row.m_sp_stat.set_field(f->field_index - 3, f);
        break;
      default: /* 8, ... COUNT/SUM/MIN/AVG/MAX */
        m_row.m_stmt_stat.set_field(f->field_index - 8, f);
        break;
      }
    }
  }

  return 0;
}