Break down Callback which has two ore more functions into the same number of PartialFunction

callback2func.scala

trait Callback{
	 def onSet(s:Set[String]):Unit
   def onList(l:List[String]):Unit
}
def funcWithCallback(s:String,callback:Callback):Unit = ???

def funcAsFuture(s:String):Future[Traversable[String]] = {
    val p = Promise[Traversable[String]]() 
    val f = p.future
	funcWithCallback(s,new Callback{
			 def onSet(s:Set[String]):Unit = p.success(s)
		   def onList(l:List[String]):Unit = p.success(l)
	})
}

val pf1:PartialFunction[Set[String],Result] = ...
val pf2:PartialFunction[List[String],Result] = ...

//If PartialFucntion is Monoid, might it be appendable as follows?
val pf:PartialFunction[Traversable[String],Result] = pf1 append pf2

//Break down Callback into two ore more PartialFunction implementations
val f:Future[Result] = for{
  trav <- funcAsFuture.map(s) 
} pf(trav)