/* Copyright (c) 2015, 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/pfs_status.cc
  Status variables statistics (implementation).
*/

#include "my_global.h"
#include "my_sys.h"
#include "pfs_global.h"
#include "pfs_instr_class.h"
#include "pfs_instr.h"
#include "pfs_account.h"
#include "pfs_host.h"
#include "pfs_user.h"
#include "pfs_status.h"
#include "pfs_atomic.h"
#include "pfs_buffer_container.h"

#include "sql_show.h" /* reset_status_vars */

PFS_status_stats::PFS_status_stats()
{
  reset();
}

void PFS_status_stats::reset()
{
  m_has_stats= false;
  memset(&m_stats, 0, sizeof(m_stats));
}

void PFS_status_stats::aggregate(const PFS_status_stats *from)
{
  if (from->m_has_stats)
  {
    m_has_stats= true;
    for (int i= 0; i < COUNT_GLOBAL_STATUS_VARS; i++)
    {
      m_stats[i] += from->m_stats[i];
    }
  }
}

void PFS_status_stats::aggregate_from(const STATUS_VAR *from)
{
  ulonglong *from_var= (ulonglong*) from;

  m_has_stats= true;
  for (int i= 0;
       i < COUNT_GLOBAL_STATUS_VARS;
       i++, from_var++)
  {
    m_stats[i] += *from_var;
  }
}

void PFS_status_stats::aggregate_to(STATUS_VAR *to)
{
  if (m_has_stats)
  {
    ulonglong *to_var= (ulonglong*) to;

    for (int i= 0;
         i < COUNT_GLOBAL_STATUS_VARS;
         i++, to_var++)
    {
      *to_var += m_stats[i];
    }
  }
}

static void fct_reset_status_by_thread(PFS_thread *thread)
{
  PFS_account *account;
  PFS_user *user;
  PFS_host *host;

  if (thread->m_lock.is_populated())
  {
    account= sanitize_account(thread->m_account);
    user= sanitize_user(thread->m_user);
    host= sanitize_host(thread->m_host);
    aggregate_thread_status(thread, account, user, host);
  }
}

/** Reset table STATUS_BY_THREAD data. */
void reset_status_by_thread()
{
  global_thread_container.apply_all(fct_reset_status_by_thread);
}

static void fct_reset_status_by_account(PFS_account *account)
{
  PFS_user *user;
  PFS_host *host;

  if (account->m_lock.is_populated())
  {
    user= sanitize_user(account->m_user);
    host= sanitize_host(account->m_host);
    account->aggregate_status(user, host);
  }
}

/** Reset table STATUS_BY_ACCOUNT data. */
void reset_status_by_account()
{
  global_account_container.apply_all(fct_reset_status_by_account);
}

static void fct_reset_status_by_user(PFS_user *user)
{
  if (user->m_lock.is_populated())
    user->aggregate_status();
}

/** Reset table STATUS_BY_USER data. */
void reset_status_by_user()
{
  global_user_container.apply_all(fct_reset_status_by_user);
}

static void fct_reset_status_by_host(PFS_host *host)
{
  if (host->m_lock.is_populated())
    host->aggregate_status();
}

/** Reset table STATUS_BY_HOST data. */
void reset_status_by_host()
{
  global_host_container.apply_all(fct_reset_status_by_host);
}

/** Reset table GLOBAL_STATUS data. */
void reset_global_status()
{
  /*
    Do not memset global_status_var,
    NO_FLUSH counters need to be preserved
  */
  reset_status_vars();
}