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Pratical eff

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Eric Torreborre
Eric Torreborre

How we use the Eff monad at Zalando in addition to a components strategy using github.com/zalando/grafter

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Eric Torreborre Practical Eff monad Doing it for real
About Zalando
Brand solutions
Article service
Articleservice Zeos products business-partners stocks 59.95 € 10 items
How to deal?
Components!
DI?
Cake?
Guice?
Spring?
Radical
Constructor injection!
Grafter
HttpServer Routes Services Clients
PriceHttpService PriceHttp4sService
Always one default
In a library?
reader all the way down!
Unit testing?
Integration testing?
HttpServer Routes Services Clients
HttpServer Routes Services Clients
Tree rewriting!
Kiama
Singleton?
HttpServer Routes Services Clients
HttpServer Routes Services Clients
Stay lazy!
Start order?
lazy reader rewrite start
Eff please!
Out of the box
Reader Eval Async State ThrowableEither Writer
Article service
FlowId
HttpServer Routes Services Clients flowId flowId flowId flowId
Logged
Applicative
Concurrent execution
MasterData PriceService Inventory
Async
Eff in Eff!
Future Monix
No applicative for-comprehension
FlowId Logged Async Eval
Mitsaeks we made
Errors
3 possibilities
1 error style per layer Translation between layers
HttpServer Routes Services Clients
Client level
Service level
Service level
Service level
Local Effects!
Everything is a (Free) DSL?
Make price request request [PriceRequest] [PriceRequest] response Interpret request [PriceRequest, Async] [Async]
Get price price [Async] [Async]
Time: effect or component?
Get status status [Eval] now? [Eval] now
Get status status [Eval] now? [Eval] now FreezedTime
Get status status [Eval, Timed] runFreezedTime(status) [Eval]
Recap
More Applicative Goodies!
Batching
Translation client Inventory
Translation client Inventory
Audited
Logs Database Event Bus
Rate limiting
Create Intercept Interpret
Pratical eff

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