Using transform instead of the mapConcat worked well for me:
val list = List.range(1, 21).grouped(5).toList
Source(list).transform("myMapConcat", () => new Transformer[List[Int], Int]
{
override def onNext(list: List[Int]) = list
}).runWith(ForeachSink(println))
result: 1..20
May this be a bug in mapConcat? I am using version 0.11
вторник, 18 ноября 2014 г., 17:29:54 UTC+4 пользователь Boris Lopukhov
написал:
>
> No, the actor system is alive. Additionally, i have repeated that code
> many times with the same result:
>
> for (i <- 1 to 10) {
> Source(list).mapConcat(x => x).runWith(ForeachSink(println))
> }
>
>
>
> вторник, 18 ноября 2014 г., 16:29:08 UTC+4 пользователь Patrik Nordwall
> написал:
>>
>> Do you shutdown the actor system prematurely?
>> /Patrik
>>
>> On Tue, Nov 18, 2014 at 1:24 PM, Boris Lopukhov <[email protected]> wrote:
>>
>>> I have isolated the problem, it seems that ActorPublisher is not the
>>> cause:
>>>
>>> val list = List.range(1, 21).grouped(5).toList
>>> Source(list).mapConcat(x => x).runWith(ForeachSink(println))
>>>
>>> expectation: 1..20
>>> reality: 1..16
>>>
>>>
>>> понедельник, 17 ноября 2014 г., 19:46:58 UTC+4 пользователь Boris
>>> Lopukhov написал:
>>>
>>>> Hi everyone!
>>>>
>>>> I am trying to create a stream with an ActorPublisher:
>>>>
>>>> class SourceActor extends ActorPublisher[List[Int]] {
>>>> import akka.stream.actor.ActorPublisherMessage.Request
>>>>
>>>> var list = List.range(1, 21).grouped(5).toList // for example
>>>>
>>>> def receive = {
>>>> case Request(elems) => while (totalDemand > 0 && isActive) {
>>>> list match {
>>>> case Nil =>
>>>> onComplete()
>>>> self ! PoisonPill
>>>> case head :: tail =>
>>>> list = tail
>>>> onNext(head)
>>>> }
>>>> }
>>>> }
>>>> }
>>>>
>>>> val sourceActor = system.actorOf(Props[SourceActor])
>>>> val source = Source(ActorPublisher[List[Int]](sourceActor))
>>>> val out = ForeachSink(println)
>>>> source.mapConcat{x => x}.runWith(out)
>>>>
>>>> I expect to see numbers from 1 to 20, but random printed from 1 to 17~19
>>>> As I understand, it occur due to the stream complete before all
>>>> elements are processed. How can I implement an ActorPublisher properly and
>>>> escape this problem?
>>>>
>>>> --
>>> >>>>>>>>>> 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
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>>
>>
>>
>> --
>>
>> Patrik Nordwall
>> Typesafe <http://typesafe.com/> - Reactive apps on the JVM
>> Twitter: @patriknw
>>
>>
--
>>>>>>>>>> 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
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