gistfile1.scala

  def toScalaFuture[A](twitterFuture: Future[A]): ScalaFuture[A] = {
    val promise = ScalaPromise[A]()
    twitterFuture.respond {
      case Return(a) => promise.success(a)
      case Throw(e) => promise.failure(e)
    }

    promise.future
  }

  def fromScalaFuture[A](scalaFuture: ScalaFuture[A])(implicit executor: ExecutionContext): Future[A] = {
    val promise = Promise[A]()
    scalaFuture.onComplete {
      case ScalaSuccess(a) => promise.setValue(a)
      case ScalaFailure(e) => promise.setException(e)
    }

    promise
  }
}