~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.

 */

/**

 * @details

 *

 * This class defines the "show status" and "show global status" 

 * DATA_DICTIONARY tables:

 * 

 * drizzle> describe SESSION_STATUS;

 * +----------------+---------+-------+---------+-----------------+-----------+

 * | Field          | Type    | Null  | Default | Default_is_NULL | On_Update |

 * +----------------+---------+-------+---------+-----------------+-----------+

 * | VARIABLE_NAME  | VARCHAR | FALSE |         | FALSE           |           | 

 * | VARIABLE_VALUE | VARCHAR | FALSE |         | FALSE           |           | 

 * +----------------+---------+-------+---------+-----------------+-----------+

 *

 * drizzle> describe GLOBAL_STATUS;

 * +----------------+---------+-------+---------+-----------------+-----------+

 * | Field          | Type    | Null  | Default | Default_is_NULL | On_Update |

 * +----------------+---------+-------+---------+-----------------+-----------+

 * | VARIABLE_NAME  | VARCHAR | FALSE |         | FALSE           |           | 

 * | VARIABLE_VALUE | VARCHAR | FALSE |         | FALSE           |           | 

 * +----------------+---------+-------+---------+-----------------+-----------+

 *

 */

#include "config.h"

#include "status_tool.h"

#include "drizzled/status_helper.h"

#include <vector>

#include <sstream>

using namespace drizzled;

using namespace plugin;

using namespace std;

class ShowVarCmpFunctor 

{

  public:

  ShowVarCmpFunctor() { }

  inline bool operator()(const drizzle_show_var *var1, const drizzle_show_var *var2) const

  {

    int val= strcmp(var1->name, var2->name);

    return (val < 0);

  }

};

StatusTool::StatusTool(LoggingStats *in_logging_stats, bool inIsLocal) :

  TableFunction("DATA_DICTIONARY", inIsLocal ? "SESSION_STATUS" : "GLOBAL_STATUS"),

  outer_logging_stats(in_logging_stats),

  isLocal(inIsLocal)

{

  add_field("VARIABLE_NAME");

  add_field("VARIABLE_VALUE", 1024);

  drizzle_show_var *var= NULL;

  uint32_t count= 0;

  vector<drizzle_show_var *>::iterator all_status_vars_iterator= all_status_vars.begin();

  while (true)

  {

    var= &StatusHelper::status_vars_defs[count];

    if ((var == NULL) || (var->name == NULL))

    {

      break;

    }

    all_status_vars_iterator= all_status_vars.insert(all_status_vars_iterator, var);

    ++count;

  }

  sort(all_status_vars.begin(), all_status_vars.end(), ShowVarCmpFunctor());

}

StatusTool::Generator::Generator(Field **arg, LoggingStats *in_logging_stats,

                                 vector<drizzle_show_var *> *all_status_vars, 

                                 bool inIsLocal) :

  TableFunction::Generator(arg),

  logging_stats(in_logging_stats),

  isLocal(inIsLocal)   

{

  all_status_vars_it= all_status_vars->begin();

  all_status_vars_end= all_status_vars->end();

  status_var_to_display= NULL;

  if (isLocal)

  {

    ScoreboardSlot *scoreboard_slot= logging_stats->getCurrentScoreboard()->findOurScoreboardSlot(&getSession());

    if (scoreboard_slot != NULL)

    {

      /* A copy of the current status vars for a particular session */ 

      status_var_to_display= new StatusVars(*scoreboard_slot->getStatusVars());

      /* Sum the current scoreboard this will give us a value for any variables that have global meaning */

      StatusVars current_scoreboard_status_vars;

      CumulativeStats *cumulativeStats= logging_stats->getCumulativeStats();

      cumulativeStats->sumCurrentScoreboard(logging_stats->getCurrentScoreboard(), &current_scoreboard_status_vars, NULL);

      /* Copy the above to get a value for any variables that have global meaning */  

      status_var_to_display->copyGlobalVariables(logging_stats->getCumulativeStats()->getGlobalStatusVars());

      status_var_to_display->copyGlobalVariables(&current_scoreboard_status_vars); 

    } 

    else 

    {

      status_var_to_display= NULL;

    }

  }

  else // global status 

  {

    status_var_to_display= new StatusVars();

    CumulativeStats *cumulativeStats= logging_stats->getCumulativeStats();

    cumulativeStats->sumCurrentScoreboard(logging_stats->getCurrentScoreboard(), status_var_to_display, NULL);

    status_var_to_display->merge(logging_stats->getCumulativeStats()->getGlobalStatusVars());

  }

}

StatusTool::Generator::~Generator()

{

  delete status_var_to_display;

}

bool StatusTool::Generator::populate()

{

  if (status_var_to_display == NULL)

  {

    return false;

  }

  while (all_status_vars_it != all_status_vars_end)

  {

    drizzle_show_var *variables= *all_status_vars_it;

    if ((variables == NULL) || (variables->name == NULL))

    {

      return false;

    }

    drizzle_show_var *var;

    MY_ALIGNED_BYTE_ARRAY(buff_data, SHOW_VAR_FUNC_BUFF_SIZE, int64_t);

    char * const buff= (char *) &buff_data;

    /*

      if var->type is SHOW_FUNC, call the function.

      Repeat as necessary, if new var is again SHOW_FUNC

    */

    {

      drizzle_show_var tmp;

      for (var= variables; var->type == SHOW_FUNC; var= &tmp)

        ((mysql_show_var_func)((st_show_var_func_container *)var->value)->func)(&tmp, buff);

    }

    if (isWild(variables->name))

    {

      ++all_status_vars_it;

      continue;

    }

    fill(variables->name, var->value, var->type);

    ++all_status_vars_it;

    return true;

  }

  return false;

}

void StatusTool::Generator::fill(const string &name, char *value, SHOW_TYPE show_type)

{

  struct system_status_var *status_var;

  ostringstream oss;

  string return_value;

  status_var= status_var_to_display->getStatusVarCounters();

  return_value= StatusHelper::fillHelper(status_var, value, show_type);

  push(name);

  if (return_value.length())

  {

    push(return_value);

  }

  else

  {

    push(" ");

  }

}