selectWithin.scala

implicit val timer = new MockTimer
val af = Future.sleep(10.seconds).before { Future.value("A") }
val bf = Future.sleep(10.seconds).before { Future.value("B") }
object DeadlineReached extends Exception

def selectWithin(deadline: Time)(remaining: Seq[Future[String]], valuesSoFar: Seq[String] = Seq()): Future[Seq[String]] =
  if (remaining.isEmpty) {
    Future.value(valuesSoFar)
  } else Future.select(remaining).flatMap { s =>
    val (t, nextRemaining) = s
    val nextValues =
      t match {
        case Throw(x) =>
          println(s"Whelp... should probably do something better for: $x")
          valuesSoFar
        case Return(v) =>
          valuesSoFar :+ v
      }
    selectWithin(deadline)(nextRemaining, nextValues)
      .raiseWithin(Time.now - deadline, DeadlineReached)
      .handle {
        // out of time: return what we have so far
        case DeadlineReached => valuesSoFar
      }
  }

selectWithin(Time.now + 10.seconds)(Seq(af, bf))