Re: [akka-user] [akka-streams] FlexiMerge/FlexiRoute parameters
I've been writing some simple code using FlexiMerge/FlexiRoute, and I'm
wondering why both have a single required OperationAttributes parameter?
Maybe there should be a * at the end to allow 0-* such parameters?
You can combine attributes with the and combinator if you want to attach
more than one.
Can I attach 0? :)
A side-question, I'm not really sure why this is so, but when I have a
Merge, I can just do:
in ~ merge ~ out
But when I have a FlexiMerge, I need to do:
in ~ flexiMerge.in0
flexiMerge.out ~ out
it seems Merge's shape is also an Inlet, but I can't find that in the
code :)
No, Merge has a shape of UniformFanIn. The sugared version of connecting
merge/broadcast only works because the DSL understands UniformFanin/Fanout
shapes, but it does not know about other shapes, since they can have
different types for each port (inlet/outlet).
Ah! Now I have:
class SplitRoute[T](splitFn: T = Either[T, T]) extends FlexiRoute[T,
UniformFanOutShape[T, T]](
new UniformFanOutShape(2), OperationAttributes.name(SplitRoute)) { ... }
and I can use the nicer DSL.
Thanks,
Adam
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Re: [akka-user] [akka-streams] FlexiMerge/FlexiRoute parameters
On Sat, May 23, 2015 at 1:37 PM, Adam Warski a...@warski.org wrote:
Hello,
I've been writing some simple code using FlexiMerge/FlexiRoute, and I'm
wondering why both have a single required OperationAttributes parameter?
Maybe there should be a * at the end to allow 0-* such parameters?
You can combine attributes with the and combinator if you want to attach
more than one.
For lack of a better value, I'm currently using OperationAttributes.name,
but that makes the code a bit noisy, as I already have to name the shape,
e.g.:
class SplitRoute[T](splitFn: T = Either[T, T]) extends FlexiRoute[T,
FanOutShape2[T, T, T]](
new FanOutShape2(SplitRoute), OperationAttributes.name(SplitRoute))
{ ... }
AFAIK there is a .named() convenience method that you can use on these
things (not in the class but when using the DSL). Also, you can import
OperationAttributes._, and then you can just call named(x) and ...
A side-question, I'm not really sure why this is so, but when I have a
Merge, I can just do:
in ~ merge ~ out
But when I have a FlexiMerge, I need to do:
in ~ flexiMerge.in0
flexiMerge.out ~ out
it seems Merge's shape is also an Inlet, but I can't find that in the code
:)
No, Merge has a shape of UniformFanIn. The sugared version of connecting
merge/broadcast only works because the DSL understands UniformFanin/Fanout
shapes, but it does not know about other shapes, since they can have
different types for each port (inlet/outlet).
-Endre
--
Thanks,
Adam
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[akka-user] [akka-streams] FlexiMerge/FlexiRoute parameters
Hello,
I've been writing some simple code using FlexiMerge/FlexiRoute, and I'm
wondering why both have a single required OperationAttributes parameter?
Maybe there should be a * at the end to allow 0-* such parameters?
For lack of a better value, I'm currently using OperationAttributes.name,
but that makes the code a bit noisy, as I already have to name the shape,
e.g.:
class SplitRoute[T](splitFn: T = Either[T, T]) extends FlexiRoute[T,
FanOutShape2[T, T, T]](
new FanOutShape2(SplitRoute), OperationAttributes.name(SplitRoute)) {
... }
A side-question, I'm not really sure why this is so, but when I have a
Merge, I can just do:
in ~ merge ~ out
But when I have a FlexiMerge, I need to do:
in ~ flexiMerge.in0
flexiMerge.out ~ out
it seems Merge's shape is also an Inlet, but I can't find that in the code
:)
--
Thanks,
Adam
--
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Check the FAQ:
http://doc.akka.io/docs/akka/current/additional/faq.html
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