I've used loops before in Akka Streams. They are tricky, and debugging is
hard, but sometimes is the right fit. I think there is an analog to
recursion, though. Many things that can be expressed as a recursive loop
can also be expressed as an unfold, and that might be a better way of doing
it.
Brian Maso
On Sat, Sep 29, 2018 at 8:14 PM Beno <andy.zelin...@gmail.com> wrote:
> Hello,
>
> I have seen threads on this forum where Akka team recommends trying to
> avoid stream loops ("they are tricky"). I have a use case where steams with
> loops could be a solution to otherwise difficult problem.
>
> the payload of the stream is a list of automatically formed case classes
> from an input file, plus a wrapper case class with . at a given stage:
>
> 1. pop the next case class in the list and match {
> case A --> do some stuff, pull some info out of A, set a field (i.e.
> create new case object to preserve immutabilty) of the wrapper case class =
> to a field of the A class, loop back to this stage with the list of case
> classes not including A
> case B --> do other stuff, add info from B to wrapper case class,
> loop back to this stage with list of case classes not including B
> .
> .
> .
> } . // and the point here is there could be 0 to many As, Bs, Cs, etc
> case F --> send to AthroughEExhaustedState
>
> 2. AthroughEExhaustedState might have its own similar rules
>
> is this insanity? or am I missing a much better solution?
>
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