Awaiting a scala future for completion w/o the Await.result, which may spawn a new thread.

ManualAwait.scala

  private def block[T](f: Future[T]): T = {
    val barrier = new CountDownLatch(1)

    import play.api.libs.concurrent.Execution.Implicits.defaultContext
    f onComplete {_ =>
      barrier.countDown()
    }

    barrier.await(30, TimeUnit.SECONDS)

    f.value.getOrElse{
      throw new RuntimeException("Future was None: " + f.isCompleted)
    }.get
  }