Sample.scala

  def parseDelegationValues(delegationValues: Seq[String]): Seq[HttpDelegationHeaderBean] = {
    // TODO: Performance concerns
    delegationValues.map(parseDelegationHeader).filter {
      case Success(_) =>
        true
      case Failure(e) =>
        LOG.warn("Failed to parse a delegation header: " + e.getMessage)
        false
    }.map(_.get)

    //Using flatmap to auto-extract
    delegationValues.map(parseDelegationHeader).flatMap {
      case Success(bean) => Some(bean)
      case Failure(e) =>
        LOG.warn("Failed to parse a delegation header: " + e.getMessage)
        None
    }

    //Least amount of looping
    delegationValues.flatMap { value =>
      parseDelegationHeader(value) match {
        case Success(bean) => Some(bean)
        case Failure(e) =>
          LOG.warn("Failed to parse a delegation header: " + e.getMessage)
          None
      }
    }
  }