Hi. You were quite close. Instead of buffer.drophead use conflate which is
a rate detached operation. That allows upstream before conflate progress
faster than downstream after the conflate.
Source
.unfold(0) { e => Some((e + 1, e)) }
.conflate[Int] { case (_, e) => e }
.throttle(1, 1.second, 1, ThrottleMode.Shaping)
.runForeach(println)
On Fri, Jul 29, 2016 at 4:27 PM, Dominykas Mostauskis <
dominykas.mostaus...@gmail.com> wrote:
> In Akka Stream, I'd like a stream with a timer that emits an element every
> n seconds. The timer should emit from a 1 element buffer that drops head on
> overflow (meaning only keeps the newest element). So essentially emit the
> newest element in intervals of n seconds. How can this be done?
>
> My attempts could not get me further than a stream that emits the newest
> element with a lag of n seconds, meaning the current timer's cycle doesn't
> sample new elements. It looked something like `in ~> buffer.drophead ~>
> throttle(1 element/per second)`.
>
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