Hi,

You can use
 - Source.unfold()  (
http://doc.akka.io/api/akka/2.4.4/index.html#akka.stream.scaladsl.Source$@unfold[S,E](s:S)(f:S=>Option[(S,E)]):akka.stream.scaladsl.Source[E,akka.NotUsed]l)

 - if you have a non-blocking API, or you can use unfoldResourceAsync (
http://doc.akka.io/api/akka/2.4.4/index.html#akka.stream.scaladsl.Source$@unfoldResourceAsync[T,S](create:()=
>scala.concurrent.Future[S],read:S=>scala.concurrent.Future[Option[T]],close:S=>scala.concurrent.Future[akka.Done]):akka.stream.scaladsl.Source[T,akka.NotUsed])

to achieve what you need. If those are not enough, you can build a custom
source:
http://doc.akka.io/docs/akka/2.4.4/scala/stream/stream-customize.html

-Endre

On Sat, Apr 16, 2016 at 6:13 AM, Akka user <thisisneha2...@gmail.com> wrote:

> Any example code that I can refer where stream Source is external service
> which gives bulk records in non reactive stream way, that we have to stream
> and manipulate the records via Flow and Sink it to DB? Which pattern of
> Akka stream we should use to make the Source? We can query External service
> for the records based on Page Size and it would be recursive call to
> external service end point to read all the records based on Page Size.
>
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