ProductSearchRepository.scala

  lazy val dbCache: Option[Cache] = ???
  lazy val realCache: scala.concurrent.Future[Cache] = ???

  def cache: Option[Cache] = {
    realCache.value match {
      case Some(Success(x))     => Some(x)
      case None                 => dbCache
      case Some(Failure(error)) =>
        log.error(error)
        dbCache
    }
  }