akka-stream

Assume I have set up an arbitrarily complex Flow[HttpRequest, HttpResponse, Unit] . I can already use said flow to handle incoming requests with Http().bindAndHandle(flow, "0.0.0.0", 8080) Now I would like to add logging, leveraging some existing directive, like logRequestResult("my-service"){...} Is there a way to combine this directive with my flow? I guess I am looking for another directive, something along the lines of def completeWithFlow(flow: Flow): Route Is this possible at all? N.B.: logRequestResult is an example, my question applies to any Directive one might find useful. Turns out

I would like to use a SourceQueue to push elements dynamically into an Akka Stream source. Play controller needs a Source to be able to stream a result using the chuncked method. As Play uses its own Akka Stream Sink under the hood, I can't materialize the source queue myself using a Sink because the source would be consumed before it's used by the chunked method (except if I use the following hack). I'm able to make it work if I pre-materialize the source queue using a reactive-streams publisher, but it's a kind of 'dirty hack' : def sourceQueueAction = Action{ val (queue, pub) = Source.queue

I have an Akka Stream and I want the stream to send messages down stream approximately every second. I tried two ways to solve this problem, the first way was to make the producer at the start of the stream only send messages once every second when a Continue messages comes into this actor. // When receive a Continue message in a ActorPublisher // do work then... if (totalDemand > 0) { import scala.concurrent.duration._ context.system.scheduler.scheduleOnce(1 second, self, Continue) } This works for a short while then a flood of Continue messages appear in the ActorPublisher actor, I assume

In Slick's documentation examples for using Reactive Streams are presented just for reading data as a means of a DatabasePublisher. But what happens when you want to use your database as a Sink and backpreasure based on your insertion rate? I've looked for equivalent DatabaseSubscriber but it doesn't exist. So the question is, if I have a Source, say: val source = Source(0 to 100) how can I crete a Sink with Slick that writes those values into a table with schema: create table NumberTable (value INT) Serial Inserts The easiest way would be to do inserts within a Sink.foreach . Assuming you've