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=str #16787 java cookbook

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Konrad Malawski 2015-07-08 10:23:10 +03:00 • committed by Martynas Mickevičius
parent 708d7017f2
commit c0e52338df
7 changed files with 413 additions and 66 deletions
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22
akka-docs-dev/rst/scala/code/docs/stream/cookbook/RecipeMultiGroupBy.scala
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@ -15,19 +15,14 @@ class RecipeMultiGroupBy extends RecipeSpec {
case class Topic(name: String)
val elems = Source(List("1: a", "1: b", "all: c", "all: d", "1: e"))
val topicMapper = { msg: Message =>
val extractTopics = { msg: Message =>
if (msg.startsWith("1")) List(Topic("1"))
else List(Topic("1"), Topic("2"))
}
class X {
//#multi-groupby
val topicMapper: (Message) => immutable.Seq[Topic] = ???
//#multi-groupby
}
//#multi-groupby
val topicMapper: (Message) => immutable.Seq[Topic] = extractTopics
val messageAndTopic: Source[(Message, Topic), Unit] = elems.mapConcat { msg: Message =>
val topicsForMessage = topicMapper(msg)
// Create a (Msg, Topic) pair for each of the topics
@ -35,11 +30,12 @@ class RecipeMultiGroupBy extends RecipeSpec {
topicsForMessage.map(msg -> _)
}
val multiGroups: Source[(Topic, Source[String, Unit]), Unit] = messageAndTopic.groupBy(_._2).map {
case (topic, topicStream) =>
// chopping of the topic from the (Message, Topic) pairs
(topic, topicStream.map(_._1))
}
val multiGroups: Source[(Topic, Source[String, Unit]), Unit] = messageAndTopic
.groupBy(_._2).map {
case (topic, topicStream) =>
// chopping of the topic from the (Message, Topic) pairs
(topic, topicStream.map(_._1))
}
//#multi-groupby
val result = multiGroups.map {