~drizzle-trunk/drizzle/development

/*

 * Copyright (C) 2010 Joseph Daly <skinny.moey@gmail.com>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *   * Redistributions of source code must retain the above copyright notice,

 *     this list of conditions and the following disclaimer.

 *   * Redistributions in binary form must reproduce the above copyright notice,

 *     this list of conditions and the following disclaimer in the documentation

 *     and/or other materials provided with the distribution.

 *   * Neither the name of Joseph Daly nor the names of its contributors

 *     may be used to endorse or promote products derived from this software

 *     without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

 * THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <config.h>

#include <drizzled/statistics_variables.h>

#include "cumulative_stats.h"

using namespace std;

using namespace drizzled;

CumulativeStats::CumulativeStats(uint32_t in_cumulative_stats_by_user_max) 

    :

      cumulative_stats_by_user_max(in_cumulative_stats_by_user_max)  

{

  cumulative_stats_by_user_vector= new vector<ScoreboardSlot *>(cumulative_stats_by_user_max);

  vector<ScoreboardSlot *>::iterator it= cumulative_stats_by_user_vector->begin();

  for (int32_t j=0; j < cumulative_stats_by_user_max; ++j)

  {

    ScoreboardSlot *scoreboard_slot= new ScoreboardSlot();

    it= cumulative_stats_by_user_vector->insert(it, scoreboard_slot);

  }

  cumulative_stats_by_user_vector->resize(cumulative_stats_by_user_max);

  last_valid_index= INVALID_INDEX;

  isOpenUserSlots= true;

  global_stats= new GlobalStats();

  global_status_vars= new StatusVars();

  /* calculate the approximate memory allocation for the cumulative statistics */

  size_t statusVarsSize= sizeof(StatusVars) + sizeof(system_status_var);

  size_t userCommandsSize= sizeof(UserCommands) + sizeof(uint64_t) * SQLCOM_END;

  cumulative_size_bytes= (statusVarsSize + userCommandsSize) * cumulative_stats_by_user_max; 

}

CumulativeStats::~CumulativeStats()

{

  vector<ScoreboardSlot *>::iterator it= cumulative_stats_by_user_vector->begin();

  for (; it < cumulative_stats_by_user_vector->end(); ++it)

  {

    delete *it;

  }

  cumulative_stats_by_user_vector->clear();

  delete cumulative_stats_by_user_vector;

  delete global_stats;

  delete global_status_vars;

}

void CumulativeStats::logUserStats(ScoreboardSlot *scoreboard_slot, bool reserveSlot)

{

  vector<ScoreboardSlot *>::iterator cumulative_it= cumulative_stats_by_user_vector->begin();

  /* Search if this is a pre-existing user */

  int32_t current_index= last_valid_index;

  if (cumulative_stats_by_user_max <= current_index)

  {

    current_index= cumulative_stats_by_user_max;

  }

  for (int32_t j=0; j <= current_index; ++j)

  {

    ScoreboardSlot *cumulative_scoreboard_slot= *cumulative_it;

    string user= cumulative_scoreboard_slot->getUser();

    if (user.compare(scoreboard_slot->getUser()) == 0)

    {

      reserveSlot= false;

      cumulative_scoreboard_slot->merge(scoreboard_slot);

      break;

    }

    ++cumulative_it;

  }

  if (reserveSlot)

  {

    /* the user was not found */

    /* its possible multiple simultaneous connections with the same user

       could result in duplicate entries here, not likely and it would

       be harmless except for duplicate users showing up in a query */

    if (hasOpenUserSlots())

    { 

      int32_t our_index= last_valid_index.add_and_fetch(1);

      if (our_index < cumulative_stats_by_user_max)

      {

        ScoreboardSlot *cumulative_scoreboard_slot=

          cumulative_stats_by_user_vector->at(our_index);

        cumulative_scoreboard_slot->setUser(scoreboard_slot->getUser());

        cumulative_scoreboard_slot->merge(scoreboard_slot);

        cumulative_scoreboard_slot->setInUse(true);

      } 

      else 

      {

        last_valid_index= cumulative_stats_by_user_max - 1; 

        isOpenUserSlots= false;

      }

    } 

  }

}

void CumulativeStats::logGlobalStats(ScoreboardSlot* scoreboard_slot)

{

  global_stats->updateUserCommands(scoreboard_slot); 

}

void CumulativeStats::logGlobalStatusVars(ScoreboardSlot* scoreboard_slot)

{

  global_status_vars->merge(scoreboard_slot->getStatusVars());

}

int32_t CumulativeStats::getCumulativeStatsLastValidIndex() const

{

  return last_valid_index < cumulative_stats_by_user_max ? last_valid_index : cumulative_stats_by_user_max;

}

void CumulativeStats::sumCurrentScoreboard(Scoreboard *scoreboard, StatusVars *current_status_vars, UserCommands *current_user_commands)

{

  /* the vector of vectors */

  vector<vector<ScoreboardSlot* >* > *vector_of_scoreboard_vectors= scoreboard->getVectorOfScoreboardVectors();

  /* iterate through each vector from above and sum each ScoreboardSlot */

  vector<vector<ScoreboardSlot* >* >::iterator v_of_scoreboard_v_begin_it= vector_of_scoreboard_vectors->begin(); 

  vector<vector<ScoreboardSlot* >* >::iterator v_of_scoreboard_v_end_it= vector_of_scoreboard_vectors->end(); 

  for (; v_of_scoreboard_v_begin_it != v_of_scoreboard_v_end_it; ++v_of_scoreboard_v_begin_it)

  {

    vector<ScoreboardSlot* > *scoreboard_vector= *v_of_scoreboard_v_begin_it;

    vector<ScoreboardSlot* >::iterator scoreboard_vector_it= scoreboard_vector->begin();

    vector<ScoreboardSlot* >::iterator scoreboard_vector_end= scoreboard_vector->end();

    for (; scoreboard_vector_it != scoreboard_vector_end; ++scoreboard_vector_it)

    {

      ScoreboardSlot *scoreboard_slot= *scoreboard_vector_it;

      if (scoreboard_slot->isInUse())

      {

        if (current_status_vars)

        {

          current_status_vars->merge(scoreboard_slot->getStatusVars());

        }

        if (current_user_commands)

        {

          current_user_commands->merge(scoreboard_slot->getUserCommands());

        }

      }

    }

  }

}