60497f6561
Also-by: Johan Andrén <johan@markatta.com> Also-by: Roland Kuhn <rk@rkuhn.info> Also-by: Martynas Mickevičius <mmartynas@gmail.com>
29 lines
737 B
Scala
29 lines
737 B
Scala
package docs.stream.cookbook
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import akka.NotUsed
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import akka.stream.scaladsl.{ Sink, Source }
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import scala.collection.immutable
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import scala.concurrent.Await
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import scala.concurrent.duration._
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class RecipeFlattenSeq extends RecipeSpec {
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"Recipe for flatteing a stream of seqs" must {
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"work" in {
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val someDataSource = Source(List(List("1"), List("2"), List("3", "4", "5"), List("6", "7")))
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//#flattening-seqs
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val myData: Source[List[Message], NotUsed] = someDataSource
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val flattened: Source[Message, NotUsed] = myData.mapConcat(identity)
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//#flattening-seqs
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Await.result(flattened.grouped(8).runWith(Sink.head), 3.seconds) should be(List("1", "2", "3", "4", "5", "6", "7"))
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}
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}
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}
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