Producer/Consumer from section "Futures and Promises" http://docs.scala-lang.org/overviews/core/futures.html

producer_consumer.scala

import scala.concurrent.{ future, promise }
import scala.concurrent.ExecutionContext.Implicits.global

val p = promise[T]
val f = p.future

val producer = future {
  val r = produceSomething()
  p success r
  continueDoingSomethingUnrelated()
}

val consumer = future {
  startDoingSomething()
  f onSuccess {
    case r => doSomethingWithResult()
  }
}