77 lines
1.9 KiB
Scala
77 lines
1.9 KiB
Scala
/**
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* Copyright (C) 2016 Lightbend Inc. <http://www.lightbend.com>
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*/
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package docs.stream
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//#imports
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import akka.stream._
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import akka.stream.scaladsl._
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//#imports
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import akka.{ NotUsed, Done }
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import akka.actor.ActorSystem
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import akka.util.ByteString
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import org.scalatest._
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import org.scalatest.concurrent._
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import scala.concurrent._
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import scala.concurrent.duration._
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import java.nio.file.Paths
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class QuickStartDocSpec extends WordSpec with BeforeAndAfterAll with ScalaFutures {
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implicit val patience = PatienceConfig(5.seconds)
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//#create-materializer
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implicit val system = ActorSystem("QuickStart")
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implicit val materializer = ActorMaterializer()
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//#create-materializer
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override def afterAll(): Unit = {
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system.terminate()
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}
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def println(any: Any) = () // silence printing stuff
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"demonstrate Source" in {
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//#create-source
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val source: Source[Int, NotUsed] = Source(1 to 100)
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//#create-source
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//#run-source
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source.runForeach(i => println(i))(materializer)
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//#run-source
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//#transform-source
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val factorials = source.scan(BigInt(1))((acc, next) => acc * next)
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val result: Future[IOResult] =
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factorials
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.map(num => ByteString(s"$num\n"))
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.runWith(FileIO.toPath(Paths.get("factorials.txt")))
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//#transform-source
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//#use-transformed-sink
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factorials.map(_.toString).runWith(lineSink("factorial2.txt"))
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//#use-transformed-sink
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//#add-streams
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val done: Future[Done] =
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factorials
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.zipWith(Source(0 to 100))((num, idx) => s"$idx! = $num")
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.throttle(1, 1.second, 1, ThrottleMode.shaping)
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//#add-streams
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.take(3)
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//#add-streams
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.runForeach(println)
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//#add-streams
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done.futureValue
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}
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//#transform-sink
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def lineSink(filename: String): Sink[String, Future[IOResult]] =
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Flow[String]
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.map(s => ByteString(s + "\n"))
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.toMat(FileIO.toPath(Paths.get(filename)))(Keep.right)
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//#transform-sink
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}
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