public function actionImport($params = null)
 {
     try {
         $params = Json::decode($params);
     } catch (InvalidParamException $e) {
         echo 'Wrong input parameters.';
         return 1;
     }
     if (empty($params['files'])) {
         return 1;
     }
     $ts = microtime(true);
     $files = [];
     foreach ($params['files'] as $file) {
         $xmlReader = new XmlFileReader($file);
         if (XmlFileReader::FILETYPE_IMPORT === $xmlReader->fileType()) {
             array_unshift($files, $file);
         } else {
             $files[] = $file;
         }
         unset($xmlReader);
     }
     foreach ($files as $file) {
         $xmlReader = new XmlFileReader($file);
         $xmlReader->parse();
         unset($xmlReader);
         unlink($file);
     }
     echo sprintf('Task working time: %s', microtime(true) - $ts);
     return 0;
 }