gistfile1.scala

  case class GetOrElseCachedValue[K, V](key: K, orElse: () => V)
  case class GetCachedValue[K, V](key: K)
  case class PutCachedValue[K, V](key: K, value: V)
  case class ReturnCachedValue[V](value: Option[V])
  case class RemoveCachedValue[K](key: K)
  case object PurgeCachedValues
  
  class CacheActor[K, V] private[cache](cache: Cache) extends Actor with ActorLogging with StatsD {

    type FV = (() => V)

    def receive = {
      case GetOrElseCachedValue(key: K, orElse: FV) =>
        sender ! ReturnCachedValue(get(key, orElse))
      case GetCachedValue(key: K) =>
        sender ! ReturnCachedValue(get(key))
      case PutCachedValue(key: K, value: FV) =>
        put(key, value)
      case RemoveCachedValue(key: K) =>
        remove(key)
      case PurgeCachedValues =>
        purge()
    }
      
    ...  
    
    def get(key: K, orElse: FV): Option[V] = {
      get(key).orElse {
        Option(orElse()).map { value =>
          val element = new Element(key, value)
          cache.put(element)
          value
        }
      }
    }
  }