50 lines
1 KiB
Scala
50 lines
1 KiB
Scala
package docs.stream.cookbook
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import akka.stream.scaladsl._
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import akka.stream.testkit._
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import scala.concurrent.duration._
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class RecipeMissedTicks extends RecipeSpec {
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"Recipe for collecting missed ticks" must {
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"work" in {
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type Tick = Unit
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val pub = TestPublisher.probe[Tick]()
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val sub = TestSubscriber.manualProbe[Int]()
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val tickStream = Source(pub)
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val sink = Sink(sub)
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//#missed-ticks
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val missedTicks: Flow[Tick, Int, Unit] =
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Flow[Tick].conflate(seed = (_) => 0)(
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(missedTicks, tick) => missedTicks + 1)
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//#missed-ticks
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tickStream.via(missedTicks).to(sink).run()
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pub.sendNext(())
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pub.sendNext(())
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pub.sendNext(())
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pub.sendNext(())
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val subscription = sub.expectSubscription()
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subscription.request(1)
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sub.expectNext(3)
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subscription.request(1)
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sub.expectNoMsg(100.millis)
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pub.sendNext(())
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sub.expectNext(0)
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pub.sendComplete()
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subscription.request(1)
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sub.expectComplete()
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}
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}
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}
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