Thanks for response, it looks good to me!
четверг, 13 ноября 2014 г., 18:36:05 UTC+4 пользователь √ написал:
>
> Hi Boris,
>
> What about something like:
>
> implicit class ListSourceMerge[T](val sources: List[Source[T]]) extends
> AnyVal {
> def merge(): Source[T] =
> sources match {
> case Nil => Source.empty[T]
> case List(source) => source
> case sources =>
> Source[T]() { implicit b =>
> val out = UndefinedSink[T]
> val merge = Merge[T]
> sources.foreach { _ ~> merge }
> merge ~> out
> out
> }
> }
> }
>
> And then you can import that one and write:
>
> val mergedSource = sources.merge()
>
> On Thu, Nov 13, 2014 at 3:30 PM, Boris Lopukhov <[email protected]
> <javascript:>> wrote:
>
>> Then, I want to create the mergedSource:
>>
>> val mergedSource = sources match {
>> case List(source) => source
>> case manySources =>
>> val merge = Merge[Message]
>> sources.map(_ ~> merge)
>> merge
>> }
>>
>>
>>
>> But the general type of a Source and a Merge is an Object.
>> Thereby I can not create the mergedSource separately from other code. I
>> need to do like:
>>
>> def createMergedSource(sources: List[Source[Message]])(implicit
>> builder : FlowGraphBuilder) = {
>> val merge = Merge[Message]
>> sources.map(_ ~> merge)
>> merge
>> }
>>
>> sources match {
>> case List(source) =>
>> source ~> doSomethink1 ~> doSomethink2 ~> .. ~> doSomethinkN ~> out
>> case manySources =>
>> createMergedSource(manySources) ~> doSomethink1 ~> doSomethink2 ~>
>> .. ~> doSomethinkN ~> out
>>
>>
>>
>> code becomes more difficult and contains the copy-paste
>>
>> четверг, 13 ноября 2014 г., 14:16:12 UTC+4 пользователь √ написал:
>>>
>>> Skip the merge if you only have 1 source?
>>>
>>> On Thu, Nov 13, 2014 at 10:34 AM, Boris Lopukhov <[email protected]>
>>> wrote:
>>>
>>>> Hi everyone!
>>>>
>>>> I have one or a few databases from which I want to download and process
>>>> data.
>>>> I would like to merge all sources and work with result flow:
>>>>
>>>> val sources = config.getConfigList("database.nodes").map(createSource
>>>> )
>>>> val merge = Merge[Message]
>>>> val mergedFlow = Flow[Message]
>>>> sources.map(_ ~> merge)
>>>> merge ~> mergedFlow
>>>>
>>>>
>>>>
>>>> but it does not work because Merge must have at least two incoming edge.
>>>> What is the cause of this constraint and how i can work around it?
>>>>
>>>> --
>>>> >>>>>>>>>> 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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>>>>
>>>
>>>
>>>
>>> --
>>> 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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>
>
>
> --
> 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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