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]
> <javascript:>> 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
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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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