Ah, I re-discovered the async callback APIs... I'd forgotten about them.
Thus, my code now becomes:
val (queue, ar) =
Source
.queue[ByteString](100, OverflowStrategy.backpressure)
.prefixAndTail(0)
.map {
case (_, in) => in
}
.toMat(Sink.head)(Keep.both)
.run
val asyncTryPull = getAsyncCallback[Unit]( _ => if (!hasBeenPulled(in))
tryPull(in))
val asyncCancel = getAsyncCallback[Unit]( _ => cancel(in))
and...
queue.offer(newBlockBuffer).andThen {
case Success(QueueOfferResult.Enqueued) => asyncTryPull.invoke(())
case _ => asyncCancel.invoke(())
}
Sanity check still appreciated. Thanks.
Cheers,
-C
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