Démystifier le réactif et l'orchestration de services avec Vert.x, Kubernetes et Kotlin

Transcript

1. Démystifier le réactif et l'orchestration de services avec Vert.x, Kubernetes

   et Kotlin

2. Julien Ponge Maitre de Conférences “Delegated consultant to Red Hat”

   on Vert.x Eclipse Golo + extensive F/OSS background ! https://julien.ponge.org/ " @jponge # @jponge  https://www.mixcloud.com/hclcast/

3. “No to average expertise on any of these technologies” !

   " (or async)

4. Kotlin? (1 slide to be an expert)

5. data class Person(val name: String, val age: Int) fun String.yo()

   { println("$this -> Yo!") } fun wrap(block: () -> Unit) { println("{{{") block() println("}}}") } fun main(args: Array<String>) { wrap { val phil = Person(name="Philippe", age=45) println(phil) phil.name.yo() } }

6. data class Person(val name: String, val age: Int) fun String.yo()

   { println("$this -> Yo!") } fun wrap(block: () -> Unit) { println("{{{") block() println("}}}") } fun main(args: Array<String>) { wrap { val phil = Person(name="Philippe", age=45) println(phil) phil.name.yo() } }

7. data class Person(val name: String, val age: Int) fun String.yo()

   { println("$this -> Yo!") } fun wrap(block: () -> Unit) { println("{{{") block() println("}}}") } fun main(args: Array<String>) { wrap { val phil = Person(name="Philippe", age=45) println(phil) phil.name.yo() } }

8. data class Person(val name: String, val age: Int) fun String.yo()

   { println("$this -> Yo!") } fun wrap(block: () -> Unit) { println("{{{") block() println("}}}") } fun main(args: Array<String>) { wrap { val phil = Person(name="Philippe", age=45) println(phil) phil.name.yo() } } {{{ Person(name=Philippe, age=45) Philippe -> Yo! }}}

9. Reactive? (because resources are scarce)

10. None

11. Application

12. Reactive systems Reactive streams Reactive programming Reactive “Responding to stimuli”

    Manifesto, Actor, Messages Resilience, Elasticity, Scalability, Asynchronous, non-blocking Data flow Back-pressure Non-blocking Data flow Events, Observable Spreadsheets Akka, Vert.x Akka Streams, RxJava, Reactor, Vert.x Reactor, Reactive Spring, RxJava, Vert.x

13. while (isRunning) { String line = bufferedReader.readLine(); switch (line.substring(0, 4))

    { case "ECHO": bufferedWriter.write(line); break // ... // other cases ( ...) // ... default: bufferedWriter.write("UNKW Unknown command"); } }

14. x 1000 = %

15. Virtual machines, Containers, etc

16. None

17. Vert.x? (async all the things!)

18. Eclipse Vert.x Open source project started in 2012 Eclipse /

    Apache licensing A toolkit for building reactive applications for the JVM 7K ⋆ on ' Built on top of ! https://vertx.io " @vertx_project

19. ( ) ( Http server verticle Database client verticle 

    Event Bus + ) “Details for user 1234?” “{data}” 4 instances 1 instance

20. Events Thread Event Loop

21.  Verticles ( ( ( public class SomeVerticle extends AbstractVerticle

    { @Override public void start() throws Exception { } @Override public void stop() throws Exception { } } class SomeVerticle : AbstractVerticle() { override fun start() { } override fun stop() { } } exports.vertxStart = function() { } exports.vertxStop = function() { }

22. (demo) Hello Kotlin + Vert.x

23. None

24. Async is hard (callback hell is just one facet)

25. Kotlin coroutines Looks “like” sequential operations async/await, Go-style channels

26. None

27. RxJava2 + Kotlin extensions Declarative data flows over event sources

    Operators transforming data + event streams

28. fun main(args: Array<String>) { val rand = Random() val o1

    = Observable .fromCallable(rand ::nextInt) .repeat() .take(500, TimeUnit.MILLISECONDS) .filter { it > 0 } .filter { it % 2 == 0 } .map { "[${it}]" } val o2 = Observable.fromIterable(1 ..Long.MAX_VALUE) Observables .zip(o1, o2) { n, id -> "${id} -> ${n}" } .subscribeBy( onNext = logger ::info, onError = { logger.error("Oh?") }, onComplete = { logger.info("Done!") } ) } “id -> [n]” zip()

29. Kubernetes? (orchestrating containers for you)

30. https://cloud.google.com/kubernetes-engine/kubernetes-comic

31. None

32. https://cloud.google.com/kubernetes-engine/kubernetes-comic

33. https://cloud.google.com/kubernetes-engine/kubernetes-comic

34. Pod Pod Pod Pod Pod Pod Pod Pod Node Node

    Master(s)

35. Same host Same network Same namespace Same volumes Same secrets

    Pod Container Container Container

36. Container Container Container Pod replicas & scaling Readiness probes Liveness

    probes Restart policy Rolling upgrades (…)

37. Using Kubernetes (minikube is your friend)

38. ⚙ Temperatures services Aggregate Alarm

39. Vert.x callbacks Coroutines, liveness RxKotlin Discovery RxKotlin, SockJS event bus

    bridge, VueJS, MongoDB

40. (demo) Kubernetes (minikube) https://github.com/jponge/demo-vertx-kotlin-rxjava2-kubernetes

41. Outro (how was the nap?)

42. Unified end-to-end reactive model + ecosystem (not just APIs…) For

    all kinds of distributed applications (even the small-scale ones) Flexible toolkit, not a framework (your needs, your call)

43. https: //youtu.be/ZkWsilpiSqw - Applications réactives avec Eclipse Vert.x . Building

    Reactive Microservices in Java https: //goo.gl/ep6yB9 . Guide to async programming with Vert.x for Java developers https: //goo.gl/AcWW3A

44. Q&A ! https://julien.ponge.org/ " @jponge # @jponge  https://www.mixcloud.com/hclcast/