<https://kotlinlang.slack.com/archives/C0B8RC352/p...

# ktor

[Tim Büthe]

https://kotlinlang.slack.com/archives/C0B8RC352/p1542703370141300

[e5l]

You could run multiple async requests with ktor:

val results = listOf(
   async { client.get<String>(...) },
   async { client.get<String>(...) }
).awaitAll()

[Tim Büthe]

Yeah, this is what I mean by “using the ktor client”. But it would be nice if I could still use Hystrix for circuit breaking and metrics and stuff like this

[rifatdover]

There is a small dsl called kystrix for that maybe it will be useful that you can combine your requests with that http://code.haleby.se/2018/09/16/kystrix-a-kotlin-dsl-for-hystrix/

[rifatdover]

By the way @e5l think Ktor needs some support for microservices. Which I belive change the game 🙂

[rifatdover]

I could not see any. Is there any?

[fitzoh]

@Tim Büthe you might want to check out https://github.com/resilience4j/resilience4j

no kotlin wrapper, but it's built around FP and should be pretty easy to integrate

[Tim Büthe]

I would guess resilience4j is also starting threads, right?

[Tim Büthe]

My question is this: Wouldn’t all the great performance gains we get from coroutines not being destroyed if every request is done in a thread anyways?

[e5l]

It depends on how you run the task

[fitzoh]

I think there's a non-thread option from looking at the resilience4j circuitbreaker docs: http://resilience4j.github.io/resilience4j/#_circuitbreaker

[fitzoh]

You can decorate any Supplier / Runnable / Function or CheckedRunnable / CheckedFunction function with CircuitBreaker.decorateCheckedSupplier(), CircuitBreaker.decorateCheckedRunnable() or CircuitBreaker.decorateCheckedFunction().

[fitzoh]

probably want to confirm, but the supplier variant probably/might run in the same thread

[fitzoh]

https://github.com/resilience4j/resilience4j/blob/master/resilience4j-circuitbreaker/src/main/java/io/github/resilience4j/circuitbreaker/CircuitBreaker.java#L520-L535

[fitzoh]

yep, looks like the supplier variant does what you want

[rifatdover]

@fitzoh I did not know resilience4j thanks