GraphStageLogic has getAsyncCallback. You define its handler method which 
returns an AsyncCallback. Then call AsyncCallback.invoke This is needed to 
re-enter the GraphStage whenever you return a Future in a custom stage.

        scalaRSF.onComplete {

          case Success(rs) => {

            val successCallback = getAsyncCallback{

              (_: Unit) => {

                if(mustFinish) completeStage() else pull(in)

                waitForHandler = false





Gary Struthers

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