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janory avatar janory commented on July 1, 2024

@gcanti this the equivalent with Akka Streams which throttles based on the elements:

import akka.stream.scaladsl._
import akka.actor.ActorSystem
import akka.stream.ThrottleMode
import scala.concurrent.ExecutionContextExecutor
import scala.concurrent.duration.DurationInt

  object Main extends App {
    implicit val system: ActorSystem = ActorSystem("Throttling")
    implicit val ec: ExecutionContextExecutor = system.dispatcher

    Source.fromIterator(() => Iterator.from(0))
       .mapConcat(i => List(i, i))
       .throttle(1, 500.millis, 1, ThrottleMode.Shaping)
       .runForeach(i => println(i))
       .onComplete(_ => system.terminate())
}

from effect.

gcanti avatar gcanti commented on July 1, 2024

@janory I'm far from being an expert on the Stream module, I'll let @tim-smart chime in

from effect.

tim-smart avatar tim-smart commented on July 1, 2024

The cost function takes the incoming Chunk, and allows you to specify the cost. In this case you could use the chunk.length as the cost.

from effect.

tim-smart avatar tim-smart commented on July 1, 2024

You could also use Stream.rechunk(1) if you only want to process single item chunks.

from effect.

janory avatar janory commented on July 1, 2024

@gcanti @tim-smart thanks for the quick reply.

The cost function takes the incoming Chunk, and allows you to specify the cost. In this case you could use the chunk.length as the cost.

Setting the cost to the Chunk's length didn't work:

import { Effect, Console, Stream, Sink, Schedule, Duration } from "effect";

const runnableStream = Stream.fromSchedule(Schedule.spaced(Duration.millis(100))).pipe(
    Stream.mapConcat(a => [a, a]),
    Stream.throttle({duration: `500 millis`, cost:  c => c.length, units: 1, burst: 1, strategy: 'shape'}),
    Stream.runForEach(Console.log)
);

Effect.runPromise(runnableStream);

This ☝️ still emits the elements in pairs.

But Stream.rechunk(1) did the trick. 👍

from effect.

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