protected function processNotifierMapper(NotifierMapper $mapper)
 {
     $notifier = $mapper->getNotifier();
     try {
         $mapper->delete();
         $notifier->execute();
     } catch (Exception $ex) {
         Yii::getLogger()->log('An error ocurred while processing notifier [' . get_class($notifier) . '].' . PHP_EOL . 'Exception: [' . $ex->getTraceAsString() . ']', Logger::LEVEL_ERROR, 'notification');
     }
 }