Thanks for the replies, so I suppose this typed actor will work just fine. 
Any execution of the 2 methods will occur at 1 thread at each time and 
state changes within the actor consists of safe publication. I run it and 
it looks good.

trait MapService[K, V]
{
    def update(k: K, v: V): Unit
    def apply(k:K):Future[V]
}

class MapServiceImpl[K, V] extends MapService[K, V]
{
    private val m = collection.mutable.Map.empty[K, V]

    override def apply(k: K) = Future.successful(m(k))

    override def update(k: K, v: V) = m(k) = v
}

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