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
...
...
a lot of other branches
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?
As you suggested, maybe I should model them as a single flow:
Flow1~> flow2 ~> ... ~> flow9
And in each flow, I do property check to see whether it's acceptable
according to A.property1. (if yes, do biz, if no, do nothing and pass on to
next flow)
I looks OK, but it introduce some "low level" logical dependencies, for
example maybe I want to reuse a complex composite flow created by others
and I can't add checking logic for A.property1.
What I want is actually a "high level" branching "Fan-out" ( like a
conditional Balance) + ordered "Fan-in"
Leon
在 2015年11月25日星期三 UTC-8上午2:50:02，Akka Team写道：
>
> Hi Leon,
>
> No, once you broadcast to two streams, they are concurrent and therefore
> have no ordering between them. Concurrent processing is the reason to use
> streams. If you have ordering requirements, then maybe you don't want
> concurrent processing for that step at all?
>
> I.e. why not just do
>
> src.mapConcat {
> if (..) do someStuff
> else do otherStuff
> }
>
> The question that you need to ask yourself is exactly the same as with
> actors: "do I need a separate actor for this (to exploit parallelism, or
> for isolation) or I can execute this as part of this actor?"
>
> -Endre
>
> On Wed, Nov 25, 2015 at 10:24 AM, Leon Ma <[email protected] <javascript:>
> > wrote:
>
>> Hi,
>>
>> I have below stream:
>>
>>
>> broadcast ~> filter1 ~> flowA ~> flowB ~> merge
>> broadcast ~> filter2 ~> flowC ~> merge
>>
>> Assuming filter1 and filter2 are exclusive, which means my input element
>> will either go upper flow or go down flow.
>>
>> How can I guarantee the order?
>>
>> Say I have a source of X, Y, Z,
>>
>> X goes upper flow, Y and Z goes down flow, if flowC runs much faster than
>> flowA + flowB, am I expect to see orders like Y', Z', X' ?
>>
>>
>> Thanks
>> Leon
>>
>>
>>
>>
>>
>> --
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>
>
> --
> Akka Team
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>
--
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