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Pratical eff-scalaitaly-2017

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Eric Torreborre
Eric Torreborre

How do we use DI and the eff monad at zalando to structure a microservice.

Technology
1 of 117
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!
What the Eff?
Out of the box
Article service
FlowId
HttpServer Routes Services Clients flowId flowId flowId flowId
Logged
Applicative
Concurrent execution
MasterData PriceService Inventory
Async
TimedFutureEffect TaskEffect TaskEffect TaskEffect TwitterFutureEffect
FlowId Logged Task Eval
No Reader[Config, ?]
Mitsaeks we made
Stack definition
At the latest moment!
Errors
3 possibilities
1 error style per layer Translation between layers
Use one error type
Use 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
Pratical eff-scalaitaly-2017
Pratical eff-scalaitaly-2017
Pratical eff-scalaitaly-2017
Pratical eff-scalaitaly-2017

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Pratical eff-scalaitaly-2017

Editor's Notes

  1. You learn new concepts....
  2. Now where to start?
  3. How do we use Eff at Zalando?
  4. Brand solutions - shop in shop (with CMS / analytics) - onboarding new merchants - small store - big brand
  5. Article service - onboarding new merchants - find an article id from the EAN - set stock, set price -> ready to sell!
  6. - evolving front-end APIs - evolving back-end services - evolving libraries
  7. What’s the proven technique for dealing with these constraints?
  8. Interface + implementation
  9. Encapsulate technical alternatives, not processes
  10. Cake Pattern? Guice? Spring?
  11. Cake Pattern? Guice? Spring?
  12. Cake Pattern? Guice? Spring?
  13. Cake Pattern? Guice? Spring?
  14. Radical idea: constructor injection
  15. Radical idea: constructor injection
  16. Radical idea: constructor injection
  17. Radical idea: constructor injection
  18. Radical idea: constructor injection
  19. Radical idea: constructor injection
  20. Radical idea: constructor injection
  21. Interfaces
  22. Radical idea: constructor injection
  23. Radical idea: constructor injection
  24. Radical idea: constructor injection
  25. Radical idea: constructor injection
  26. Radical idea: constructor injection
  27. Laziness is essential, nothing should start!
  28. Laziness is essential, nothing should start!
  29. Lazyness is essential, nothing should start!
  30. Start services from the bottom-up and collect results
  31. What has Eff to do with all of this?
  32. Which effects we want to use? Future, Reader, Writer?
  33. What has Eff to do with all of this?
  34. Either as request
  35. Either as request, interpreted with runEither
  36. Article service - onboarding new merchants - find an article id from the EAN - set stock, set price -> ready to sell!
  37. Radical idea: constructor injection
  38. Concurrent execution Batching
  39. Concurrent execution Batching
  40. Concurrent execution Batching
  41. Concurrent execution Batching
  42. What’s the problem with Future again?
  43. What’s the problem with Future again?
  44. This means that we don’t have to expose all effects at the component level!
  45. How do we deal with errors?
  46. How do we deal with errors?
  47. How do we deal with errors? - low level - domain level
  48. How do we deal with errors?
  49. How do we deal with errors?
  50. This means that we don’t have to expose all effects at the component level!
  51. This means that we don’t have to expose all effects at the component level!
  52. In general components are not interpreters except to
  53. Make price request gives you back a *program*
  54. Make price request gives you back a *program*
  55. Make price request gives you back a *computation*
  56. Recap on a service signature
  57. Recap on a service signature
  58. That's all folks!
  59. How do we deal with errors? - low level - domain level
  60. Concurrent execution Batching
  61. Concurrent execution Batching
  62. Batching
  63. Concurrent execution Batching
  64. Concurrent execution Batching
  65. Concurrent execution Batching
  66. Concurrent execution Batching