/**
  * @param LoggerInterface $logger
  * @param OutputInterface $output
  */
 protected function attachConsoleHandler(LoggerInterface $logger, OutputInterface $output)
 {
     if (!class_exists('Monolog\\Logger') || !$logger instanceof \Monolog\Logger) {
         return;
     }
     foreach ($logger->getHandlers() as $handler) {
         if ($handler instanceof ConsoleHandler) {
             return;
         }
     }
     $logger->pushHandler(new ConsoleHandler($output));
 }