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

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

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“No to average expertise on any of these technologies” ! " (or async)

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Kotlin? (1 slide to be an expert)

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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) { wrap { val phil = Person(name=“Philippe C”, age=49) println(phil) phil.name.yo() } }

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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) { wrap { val phil = Person(name=“Philippe C”, age=49) println(phil) phil.name.yo() } }

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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) { wrap { val phil = Person(name=“Philippe C”, age=49) println(phil) phil.name.yo() } }

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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) { wrap { val phil = Person(name=“Philippe C”, age=49) println(phil) phil.name.yo() } } {{{ Person(name=Philippe C, age=49) Philippe -> Yo! }}}

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Reactive? (because resources are scarce)

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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

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Application

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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"); } }

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x 1000 = %

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Virtual machines, Containers, etc

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Vert.x? (async all the things!)

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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

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( ) ( Http server verticle Database client verticle  Event Bus + ) “Details for user 1234?” “{data}” 4 instances 1 instance

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Events Thread Event Loop ( ( ( ( (

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(demo) Hello Kotlin + Vert.x

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Async is hard (callback hell is just one facet)

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Kotlin coroutines Looks “like” sequential operations async/await + Go-style channels 1/2

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RxJava2 + Kotlin extensions Declarative data flows over event sources Operators transforming data + event streams 2/2

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fun main(args: Array) { 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!") } ) }

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fun main(args: Array) { 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!") } ) }

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fun main(args: Array) { 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()

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Kubernetes? (orchestrating containers for you)

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

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

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Pod Pod Pod Pod Pod Pod Pod Pod Node Node Master(s)

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Same host Same network Same namespace Same volumes Same secrets Pod Container Container Container

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Container Container Container Pod replicas & scaling Readiness probes Liveness probes Restart policy Rolling upgrades (…)

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Using Kubernetes (minikube is your friend)

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⚙ Temperatures services Aggregate Alarm

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

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Outro (how was the nap?)

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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)

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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

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Lunch at your company?

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