On Thu, Nov 26, 2015 at 8:30 AM, Leon Ma <[email protected]> wrote: > I don't quite catch the word "inline" >
I answered to your original question, why "add" is needed. I wanted to hint you to try not adding a Broadcast and try it out that way :) (to help figure out yourself) Anyway, the simple answer is that every component used in the graph needs to be added. The only difference is with flows, sinks and sources is that the library can do it automatically for you, since you don't need to refer to that flow in a second expression. To fully wire a broadcast you need two expressions at least, because you cannot wire both input ports in one expression. Therefore you need a stable name (a val) to be able to refer to it in those two expressions. This is not necessary for a flow, which can be wired in one expression: out ~> flow ~> in. It is actually equivalent to out ~> b.add(flow) ~> in. We considered removing the auto-import feature and requiring explicit addition for everything. -Endre > > Let me make it a little complex: > > Assuming I have a source, for each element A of the source: > > if(A.property1 == 1) goes to flow1 + flow2 + flow3 > if(A.property1 ==2) goes to flow4 + flow5 > if(A.property1 == 3) goes to flow6 + flow7 + flow8 + flow9 > ... > ... > > > > > It seems what I want is a black box composite flow that encapsulate all > above sub flows and output them in orders. > > How should I do branching for above cases? > > > > Leon > > > 在 2015年11月25日星期三 UTC-8上午2:46:25，Akka Team写道： >> >> Hi Leon, >> >> Have you tried not adding a broadcast and try to use it inline? >> >> -Endre >> >> On Wed, Nov 25, 2015 at 10:09 AM, Leon Ma <[email protected]> wrote: >> >>> Hi, >>> >>> I have some questions regarding below code: >>> >>> val myFlow: Flow[A, B, Any] = >>> Flow.fromGraph(FlowGraph.create() { implicit b => >>> import akka.stream.scaladsl.FlowGraph.Implicits._ >>> >>> val broadcast = b.add(Broadcast[A](2)) >>> val merge = b.add(Merge[B](2)) >>> >>> val flow1 = Flow[A].map(...) >>> val flow2 = b.add(Flow[A].map(...)) >>> >>> broadcast ~> flow1 ~> merge >>> broadcast ~> flow2 ~> merge >>> >>> // expose ports >>> FlowShape(broadcast.in , merge.out) >>> }) >>> >>> >>> Question: >>> >>> What's the purpose of b.add(...)? What's the difference if I don't use >>> it, just like flow1? >>> >>> Thanks >>> Leon >>> >>> >>> -- >>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>> >>>>>>>>>> Check the FAQ: >>> http://doc.akka.io/docs/akka/current/additional/faq.html >>> >>>>>>>>>> Search the archives: >>> https://groups.google.com/group/akka-user >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "Akka User List" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at http://groups.google.com/group/akka-user. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> Akka Team >> Typesafe - Reactive apps on the JVM >> Blog: letitcrash.com >> Twitter: @akkateam >> > -- > >>>>>>>>>> Read the docs: http://akka.io/docs/ > >>>>>>>>>> Check the FAQ: > http://doc.akka.io/docs/akka/current/additional/faq.html > >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user > --- > You received this message because you are subscribed to the Google Groups > "Akka User List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > -- Akka Team Typesafe - Reactive apps on the JVM Blog: letitcrash.com Twitter: @akkateam -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.
