CachingRepo.scala

class CachingRepo(repo: Repo) extends Repo {

  def plotd: Future[String] = Cache.getAs[Future[String]](CacheKey.plotd) match {
    case Some(value) => value
    case None => repo.plotd map { valueFromRepo =>
      Cache.set(CacheKey.plotd, Future(valueFromRepo))
      valueFromRepo
    }
  }

}