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Code example for collect and collectType (#27744)

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Co-Authored-By: Helena Edelson <helena@users.noreply.github.com>
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Patrik Nordwall 2019-09-19 11:22:37 +02:00 • committed by GitHub
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akka-docs/src/test/scala/docs/stream/operators/sourceorflow/Collect.scala Normal file
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/*
* Copyright (C) 2019 Lightbend Inc. <https://www.lightbend.com>
*/
package docs.stream.operators.sourceorflow
import akka.NotUsed
import akka.stream.scaladsl.Flow
object Collect {
//#collect-elements
trait Message
final case class Ping(id: Int) extends Message
final case class Pong(id: Int)
//#collect-elements
def collectExample(): Unit = {
//#collect
val flow: Flow[Message, Pong, NotUsed] =
Flow[Message].collect {
case Ping(id) if id != 0 => Pong(id)
}
//#collect
}
def collectType(): Unit = {
//#collectType
val flow: Flow[Message, Pong, NotUsed] =
Flow[Message].collectType[Ping].filter(_.id != 0).map(p => Pong(p.id))
//#collectType
}
}