code: @Override
    public String getCanonicalServiceName() {
      String service = null;
      if (delegationTokens != null) {
        service = delegationTokens.getService().toString();
      }
      logger.atFine().log("GHFS.getCanonicalServiceName:=> %s", service);
      return service;
    }
docs: {@inheritDoc}
  
  <p>Returns the service if delegation tokens are configured, otherwise, null.