Simple retries with future-based networking code in Scala (with exponential back-off)

retry-with-exponential-backoff.scala

def networkRequestWithRetries(factor: Float = 1.5f, init: Int = 1, cur: Int = 0)
                             (implicit as: ActorSystem): Future[String] = {
  networkRequest().recoverWith {
    case NetworkException =>
      val next: Int =
          if (cur == 0) init
          else Math.ceil(cur * factor).toInt
      println(s"retrying after ${next} ms")
      after(next.milliseconds, as.scheduler, global, Future.successful(1)).flatMap { _ =>
        networkRequestWithRetries(factor, init, next)
      }
    
    case t: Throwable         => throw t
  }
}