Hi Akka community,
I'm looking to confirm that the below strategy for managing back pressure
in sub-flows is sane.
I have a need to create a sub-flow within a custom stage. In order to
create the sub-flow, I'm using `prefixAndTail` as follows:
val (queue, source) =
Source
.queue[ByteString](100, OverflowStrategy.backpressure)
.prefixAndTail(0)
.map {
case (_, in) => in
}
.toMat(Sink.head)(Keep.both)
.run
This then provides me with a means to feed my custom stage's pushed input
into the sub-flow via a queue and source respectively:
queue.offer(bytes).andThen {
// Note that we're calling pull and cancel from a different thread.
// This is fine though given that the stage's onPush will not be called
// again until we pull or cancel.
case Success(QueueOfferResult.Enqueued) => pull(in)
case _ => cancel(in)
}
Thus I only wish to pull for more elements when backpressure permits.
Thanks for any confirmation or otherwise.
Kind regards,
Christopher
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