On Wed, Oct 19, 2016 at 2:43 PM, Alexey Shuksto <seig...@gmail.com> wrote:
> 1. Flow itself is a bidi-codec from ByteString to our own Request/Response
> entities. Each Request has Promise[Response] attribute. Shared state is
> more like Map[Request.Id, Promise[Response]] -- because order of Responses
> are not guarantied.
>
Ok, so a sort of "correlator"-stage?
>
> 2. It should have state shared only "inside" this one materialized flow.
>
Yes, so the BidiFlow you create has shared state tied to the intance, not
the mateiralization.
I think you'll need to create a custom GraphStage with a BidiShape.
>
> среда, 19 октября 2016 г., 15:23:04 UTC+3 пользователь √ написал:
>
>>
>>
>> On Wed, Oct 19, 2016 at 2:18 PM, Alexey Shuksto <sei...@gmail.com> wrote:
>>
>>> 2 Konrad: Yep, in original question I meant not 'DSL construction time'
>>> but 'execution time' thread-safety. Thanks for clarification.
>>>
>>> 2 Victor: Use case is simple: outgoing flow need to store `Promise` of
>>> future remote response in some shared state which then would be completed
>>> by incoming flow.
>>>
>>
>> So it's a bidirectional buffer of Promises and Futures?
>>
>>
>>
>>
>>> There could be as many promises as there were outgoing messages, but the
>>> order of responses are not guaranteed and there could be additional
>>> messages in incoming flow.
>>>
>>> What do you meant by 'actively prevents multiple materializations'?
>>>
>>
>> What happens when you materialize that bidiflow N times?
>>
>>
>>>
>>> среда, 19 октября 2016 г., 14:29:14 UTC+3 пользователь √ написал:
>>>>
>>>> Hi Alexey,
>>>>
>>>> Not only is it not thread-safe, but it also actively prevents multiple
>>>> materializations.
>>>>
>>>> Perhaps if you state your use-case we can suggest an alternative?
>>>>
>>>> On Wed, Oct 19, 2016 at 1:24 PM, Alexey Shuksto <sei...@gmail.com>
>>>> wrote:
>>>>
>>>>> Hello hAkkers,
>>>>>
>>>>> Simple example:
>>>>> val zipper = BidiFlow.fromGraph(GraphDSL.create() { b =>
>>>>> var counter = 0
>>>>>
>>>>> val outbound = b.add(Flow[String].map { str =>
>>>>> counter += 1
>>>>> str -> counter
>>>>> })
>>>>> val inbound = b.add(Flow[(String, Int)].map { pair =>
>>>>> counter -= 1
>>>>> pair._1
>>>>> })
>>>>>
>>>>> BidiShape.fromFlows(outbound, inbound)
>>>>> })
>>>>>
>>>>> Can I presume that contents of 'build block' is thread-safe or I need
>>>>> to guard `counter` somehow (use `AtomicInt` and such)?
>>>>>
>>>>> Also, do BidiFlow support 'duplex' mode or they process
>>>>> incoming/outgoing messages one at time?
>>>>>
>>>>> --
>>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/c
>>>>> urrent/additional/faq.html
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>>>>
>>>>
>>>>
>>>> --
>>>> Cheers,
>>>> √
>>>>
>>> --
>>> >>>>>>>>>> Read the docs: http://akka.io/docs/
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>>
>>
>>
>> --
>> Cheers,
>> √
>>
> --
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> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/
> current/additional/faq.html
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--
Cheers,
√
--
>>>>>>>>>> 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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