[akka-user] akka-streams 1.0-m4 load balancer creation stuck

[Luis Ángel Vicente Sánchez]

I'm trying to create a generic load balancer and the code looks like this:

import akka.stream.scaladsl.{ Merge, Broadcast, FlowGraph }
import akka.stream.{ FlowShape, Graph }

object Balancer {
  def apply[A, B, C](nrOfWorkers: Int, workerGraph: Graph[FlowShape[A, B],
Unit]): Graph[FlowShape[A, B], Unit] =
    FlowGraph.partial(workerGraph) { implicit builder =>
      worker =>
        import FlowGraph.Implicits._

        val broadcast = builder.add(Broadcast[A](nrOfWorkers))
        val merge = builder.add(Merge[B](nrOfWorkers))

        for (i <- 0 until nrOfWorkers) {
          broadcast.out(i) ~> worker ~> merge.in(i)
        }

        FlowShape(broadcast.in, merge.out)
    }
}

With nrOfWorkers > 1, the creation of this partial graph get stuck after
the first iteration. Am I missing something? I was expecting this to create
as many workers as desired.

Regards,

Luis

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