Akka streams example 2

AkkaStreamsExample2.scala

import akka.actor._
import akka.stream._
import akka.stream.scaladsl.Source

import scala.concurrent.duration._
import scala.concurrent.{ExecutionContext, Future}
import scala.util.{Failure, Success}

/*
 * Run using foldAsync to accumulate results
 */
object TestStreamApp extends App {
  private implicit val executionContext = ExecutionContext.Implicits.global
  implicit val system = ActorSystem("TestSystem")
  implicit val materializer = ActorMaterializer()

  def process(page: Int): Future[Int] =
    Future.successful(page)

  val l: Stream[Int] = 1 #:: l.map(_ + 1)

  val streamedTasks =
    Source(l)
      .takeWhile(_ <= 5)
      .throttle(1, 3 seconds)
      .runFoldAsync(0) { (acc, v) =>
        process(v).map(v => acc + 1)
      }


  streamedTasks.onComplete {
    case Success(amount) => println(s"Processed $amount values")
    case Failure(ex) => println("Failed to completed tasks", ex)
  }

}