Created
March 20, 2019 10:38
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fs2 with Alpakka Kafka
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import akka.actor.ActorSystem | |
import akka.kafka.scaladsl.Consumer | |
import akka.kafka.{ConsumerSettings, Subscriptions} | |
import akka.stream.ActorMaterializer | |
import akka.stream.scaladsl.{Keep, Sink => AkkaSink} | |
import cats.effect.{ConcurrentEffect, ExitCode, IO, Resource} | |
import cats.implicits._ | |
import fs2.interop.reactivestreams._ | |
import org.apache.kafka.common.serialization.StringDeserializer | |
object AkkaTest { | |
def run[F[_]](implicit F: ConcurrentEffect[F]): F[ExitCode] = { | |
val app = for { | |
system <- Resource.make(F.delay(ActorSystem()))( | |
system => F.liftIO(IO.fromFuture(IO(system.terminate())).void) | |
) | |
mat <- Resource.liftF(F.delay(ActorMaterializer()(system))) | |
consumerSettings <- Resource.liftF( | |
F.delay( | |
ConsumerSettings( | |
system, | |
new StringDeserializer, | |
new StringDeserializer | |
).withBootstrapServers("localhost:9092") | |
.withGroupId("test") | |
) | |
) | |
publisher <- Resource | |
.make(F.delay { | |
Consumer | |
.committableSource(consumerSettings, Subscriptions.topics("test-topic")) | |
.toMat(AkkaSink.asPublisher(false))(Keep.both) | |
.run()(mat) | |
}) { | |
case (control, _) => F.liftIO(IO.fromFuture(IO(control.shutdown))).void | |
} | |
.map(_._2) | |
fs2Stream = publisher.toStream[F] | |
messages <- Resource.liftF(fs2Stream.take(50).compile.toVector) | |
_ <- Resource.liftF(F.delay(println(messages.mkString("\n")))) | |
} yield 0 | |
app.use(_ => ExitCode.Success.pure[F]) | |
} | |
} |
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