/**
  * given an exported file that has no imported acknowledgment file
  * check if the time the file was exported exceed the configured waiting time
  * then return true to indicate the file need to be resend otherwise return false to keep waiting
  * @param string $exportedFile the exported file that don't currently have an imported acknowledgment file
  * @return bool true exported file exceed the configured waiting time otherwise false
  */
 protected function _isTimedOut($exportedFile)
 {
     return $this->_coreHelper->getFileTimeElapse($exportedFile) > (int) $this->_getConfigMapValue(self::CFG_WAIT_TIME_LIMIT);
 }