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akka.stream.contrib

TimeWindow

object TimeWindow

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  4. def apply[A, S](of: FiniteDuration, eager: Boolean = true)(seed: (A) ⇒ S)(aggregate: (S, A) ⇒ S): Flow[A, S, NotUsed]

    Aggregates data for predefined amount of time.

    Aggregates data for predefined amount of time. The computed aggregate is emitted after window expires, thereafter a new window starts.

    For example:

    Source.tick(0.seconds, 100.milliseconds, 1)
       .via(TimeWindow(500.milliseconds, eager = false)(identity[Int])(_ + _))

    will emit sum of 1s after each 500ms - so you could expect a stream of 5s if timers were ideal If eager had been true in the following example, you would have observed initial 1 with no delay, followed by stream of sums

    A

    type of incoming element

    S

    type of outgoing (aggregated) element

    of

    window duration

    eager

    if true emits the very first seed with no delay, otherwise the first element emitted is the result of the first time-window aggregation

    seed

    provides the initial state when a new window starts

    aggregate

    produces updated aggregate

    returns

    flow implementing time-window aggregation

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