/**
  * @static Construct the singleton instance of this class.
  *
  * @param GatewayType $gateway_adapter
  *
  * @return Gateway_Extras_SessionVelocityFilter
  */
 private static function singleton(GatewayType $gateway_adapter)
 {
     if (!self::$instance || $gateway_adapter->isBatchProcessor()) {
         self::$instance = new self($gateway_adapter);
     }
     return self::$instance;
 }
 protected function runSessionVelocityFilter()
 {
     $result = Gateway_Extras_SessionVelocityFilter::onProcessorApiCall($this);
     if ($result == false) {
         $this->logger->info('Processor API call aborted on Session Velocity filter');
         $this->setValidationAction('reject');
     }
     return $result;
 }