/**
* This function measures the execution time of the given callback. It will be measured in seconds, with a precision
* of 4 digits.
* @param callback The callback to be called.
* @param mixed Reference to the returnvalue container.
* @param array An array which holds all the parameters for the callback
* @return string The amount of time required for execution of the callback
*/
public static final function timeCall($callback, &$returnVal, array $parameters = array())
{
if (is_callable($callback)) {
$timer = new \System\Calendar\Timer();
$timer->start();
$returnVal = call_user_func_array($callback, $parameters);
$timer->stop();
return $timer->getDuration();
} else {
throw new \InvalidArgumentException('callback parameter is not a valid callback');
}
}
/**
* Creates a new database resultset. This function is automatically called by the database and should not
* be called directly.
* @param \MySQLi The link to the database system
* @param \System\Db\Query The query
* @param \System\Db\Database The database issueing the request
*/
public function __construct(\MySQLi $databaseLink, \System\Db\Query $query, \System\Db\Database $database)
{
$this->databaseLink = $databaseLink;
$this->requestIssuer = $database;
$this->query = $query;
//increase its own querycounter
self::$queryCount++;
$timer = new \System\Calendar\Timer();
$timer->start();
$actualQuery = $query->getQuery();
if (!($this->results = $databaseLink->query($actualQuery))) {
throw new \System\Error\Exception\DatabaseQueryException('Query: ' . $actualQuery . ' - ' . $databaseLink->error);
}
/**
* If there is a query that wants to execute the amount of found rows, we store this amount in the own vector.
* Do note that this query gets logged before the actual query, because of the stackframe buildup. The actual execution order is correct
*/
if (strpos($actualQuery, 'SQL_CALC_FOUND_ROWS') !== false) {
$query = new \System\Db\Query($database, 'SELECT FOUND_ROWS() AS amount');
$this->totalAmount = $database->queryScalar($query)->first();
} else {
$this->totalAmount = $this->count();
}
$timer->stop();
$this->duration = $timer->getDuration();
self::$totalQueryTime += $this->duration;
if (round($timer->getDuration()) >= self::SLOW_QUERY_TIME) {
$event = new \System\Event\Event\OnSlowMySQLQueryEvent();
$event->setQuery($query);
$event->setDuration($this->duration);
$event->raise($this);
}
$this->rewind();
}
