Continuing on with refactoring this into a better example, I came up with
the following graph:
val retrieveFromCacheOrUrl: Graph[FlowShape[String, Option[Content]], Unit
] = FlowGraph.partial() { implicit b =>
import FlowGraph.Implicits._
val cacheBroadcast = b.add(Broadcast[String](2))
val zip = b.add(Zip[String, Option[Content]]())
cacheBroadcast ~> zip.in0
cacheBroadcast ~> fetchCache ~> zip.in1
val filterBroadcast = b.add(Broadcast[(String, Option[Content])](2))
val cacheHitFilter = b.add(Flow[(String, Option[Content])].filter(_._2.
isDefined).map(_._2))
val cacheMissFilter = b.add(Flow[(String, Option[Content])].filter(_._2.
isEmpty).map(_._1))
val merge = b.add(Merge[Option[Content]](2))
zip.out ~> filterBroadcast
filterBroadcast ~> cacheHitFilter ~> merge
filterBroadcast ~> cacheMissFilter ~> fetchUrl ~> merge
FlowShape(cacheBroadcast.in, merge.out)
}
--
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>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
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