Something very simple which come to my mind is  to mapAsync to the ask 
pattern and then do a "schedule of 10 secs" if the element is an empty list.



Am Sonntag, 20. März 2016 14:31:51 UTC+1 schrieb [email protected]:
>
> val input  = Source(List(List(1, 2, 3), List(1, 2, 3), List(), 
> List(),List(),List(),List(1, 2, 3))
>
>
> 1) Process input. for example input.via(throttleFlow).mapConcat(t => t)
>
> where throttleFlow show do the *following:*
>
>
> 2) If element of source has size > 0 pass it immediately  downstream.
>
> 3) Or if element of source has size == 0 wait 10 secs
>
>
> Can this be done with the build in stages?
>
>
>  

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