/* Copyright (c) 2008, 2010, 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 as published by
  the Free Software Foundation; version 2 of the License.

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

/**
  @file storage/perfschema/table_events_waits_summary.cc
  Table EVENTS_WAITS_SUMMARY_BY_xxx (implementation).
*/

#include "my_global.h"
#include "my_pthread.h"
#include "pfs_instr_class.h"
#include "pfs_column_types.h"
#include "pfs_column_values.h"
#include "table_events_waits_summary.h"
#include "pfs_global.h"

THR_LOCK table_events_waits_summary_by_instance::m_table_lock;

PFS_engine_table_share
table_events_waits_summary_by_instance::m_share=
{
  { C_STRING_WITH_LEN("events_waits_summary_by_instance") },
  &pfs_truncatable_acl,
  &table_events_waits_summary_by_instance::create,
  NULL, /* write_row */
  &table_events_waits_summary_by_instance::delete_all_rows,
  NULL, /* get_row_count */
  1000, /* records */
  sizeof(pos_all_instr),
  &m_table_lock,
  { C_STRING_WITH_LEN("CREATE TABLE events_waits_summary_by_instance("
                      "EVENT_NAME VARCHAR(128) not null,"
                      "OBJECT_INSTANCE_BEGIN BIGINT unsigned not null,"
                      "COUNT_STAR BIGINT unsigned not null,"
                      "SUM_TIMER_WAIT BIGINT unsigned not null,"
                      "MIN_TIMER_WAIT BIGINT unsigned not null,"
                      "AVG_TIMER_WAIT BIGINT unsigned not null,"
                      "MAX_TIMER_WAIT BIGINT unsigned not null)") }
};

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

int table_events_waits_summary_by_instance::delete_all_rows(void)
{
  reset_events_waits_by_instance();
  return 0;
}

table_events_waits_summary_by_instance
::table_events_waits_summary_by_instance()
  : table_all_instr(&m_share), m_row_exists(false)
{}

void table_events_waits_summary_by_instance
::make_instr_row(PFS_instr *pfs, PFS_instr_class *klass,
                 const void *object_instance_begin,
                 PFS_single_stat *pfs_stat)
{
  pfs_lock lock;
  m_row_exists= false;

  /*
    Protect this reader against a mutex/rwlock/cond destroy,
    file delete, table drop.
  */
  pfs->m_lock.begin_optimistic_lock(&lock);

  m_row.m_name= klass->m_name;
  m_row.m_name_length= klass->m_name_length;
  m_row.m_object_instance_addr= (intptr) object_instance_begin;

  get_normalizer(klass);
  m_row.m_stat.set(m_normalizer, pfs_stat);

  if (pfs->m_lock.end_optimistic_lock(&lock))
    m_row_exists= true;
}

/**
  Build a row, for mutex statistics in a thread.
  @param pfs              the mutex this cursor is reading
*/
void table_events_waits_summary_by_instance::make_mutex_row(PFS_mutex *pfs)
{
  PFS_mutex_class *safe_class;
  safe_class= sanitize_mutex_class(pfs->m_class);
  if (unlikely(safe_class == NULL))
    return;

  make_instr_row(pfs, safe_class, pfs->m_identity, &pfs->m_mutex_stat.m_wait_stat);
}

/**
  Build a row, for rwlock statistics in a thread.
  @param pfs              the rwlock this cursor is reading
*/
void table_events_waits_summary_by_instance::make_rwlock_row(PFS_rwlock *pfs)
{
  PFS_rwlock_class *safe_class;
  safe_class= sanitize_rwlock_class(pfs->m_class);
  if (unlikely(safe_class == NULL))
    return;

  make_instr_row(pfs, safe_class, pfs->m_identity, &pfs->m_rwlock_stat.m_wait_stat);
}

/**
  Build a row, for condition statistics in a thread.
  @param pfs              the condition this cursor is reading
*/
void table_events_waits_summary_by_instance::make_cond_row(PFS_cond *pfs)
{
  PFS_cond_class *safe_class;
  safe_class= sanitize_cond_class(pfs->m_class);
  if (unlikely(safe_class == NULL))
    return;

  make_instr_row(pfs, safe_class, pfs->m_identity, &pfs->m_cond_stat.m_wait_stat);
}

/**
  Build a row, for file statistics in a thread.
  @param pfs              the file this cursor is reading
*/
void table_events_waits_summary_by_instance::make_file_row(PFS_file *pfs)
{
  PFS_file_class *safe_class;
  safe_class= sanitize_file_class(pfs->m_class);
  if (unlikely(safe_class == NULL))
    return;

  PFS_single_stat sum;
  pfs->m_file_stat.m_io_stat.sum_waits(& sum);
  /*
    Files don't have a in memory structure associated to it,
    so we use the address of the PFS_file buffer as object_instance_begin
  */
  make_instr_row(pfs, safe_class, pfs, & sum);
}

/**
  Build a row, for socket statistics in a thread.
  @param pfs              the socket this cursor is reading
*/
void table_events_waits_summary_by_instance::make_socket_row(PFS_socket *pfs)
{
  PFS_socket_class *safe_class;
  safe_class= sanitize_socket_class(pfs->m_class);
  if (unlikely(safe_class == NULL))
    return;

  /*
     Consolidate wait times and byte counts for individual operations. This is
     done by the consumer in order to reduce overhead on the socket instrument.
  */
  PFS_byte_stat pfs_stat;
  pfs->m_socket_stat.m_io_stat.sum(&pfs_stat);

  /*
    Sockets don't have an associated in-memory structure, so use the address of
    the PFS_socket buffer as object_instance_begin.
  */
  make_instr_row(pfs, safe_class, pfs, &pfs_stat);
}

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

  if (unlikely(! m_row_exists))
    return HA_ERR_RECORD_DELETED;

  /* 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: /* NAME */
        set_field_varchar_utf8(f, m_row.m_name, m_row.m_name_length);
        break;
      case 1: /* OBJECT_INSTANCE */
        set_field_ulonglong(f, m_row.m_object_instance_addr);
        break;
      case 2: /* COUNT */
        set_field_ulonglong(f, m_row.m_stat.m_count);
        break;
      case 3: /* SUM */
        set_field_ulonglong(f, m_row.m_stat.m_sum);
        break;
      case 4: /* MIN */
        set_field_ulonglong(f, m_row.m_stat.m_min);
        break;
      case 5: /* AVG */
        set_field_ulonglong(f, m_row.m_stat.m_avg);
        break;
      case 6: /* MAX */
        set_field_ulonglong(f, m_row.m_stat.m_max);
        break;
      default:
        DBUG_ASSERT(false);
      }
    }
  }

  return 0;
}

