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在akka-stream cookbook documentation該代碼段示出了如何觸發元件的編程的流量:觸發信號流
val graph = RunnableGraph.fromGraph(GraphDSL.create() { implicit builder =>
import GraphDSL.Implicits._
val zip = builder.add(Zip[Message, Trigger]())
elements ~> zip.in0
triggerSource ~> zip.in1
zip.out ~> Flow[(Message, Trigger)].map { case (msg, trigger) => msg } ~> sink
ClosedShape
})
在這個例子中,如何Trigger
triggerSource
和會是什麼樣?