Reactive Programming for Real Use Cases
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The document outlines a presentation by Alex Soto on reactive programming and its applications, emphasizing the shift from event-driven to responsive systems using tools like Quarkus and reactive frameworks. It discusses the benefits of asynchronous and non-blocking execution models, showcasing examples like beer service pagination and message processing. Additionally, it touches on concepts such as resilience, elasticity, and data flow management in a reactive programming context.
![@alexsotob38
Put on your Sunday clothes
there's lots of world
out there.
— Wall-E
“
[https://github.com/lordofthejars/rp4rp]](https://image.slidesharecdn.com/rp4rp-200210063017/85/Reactive-Programming-for-Real-Use-Cases-38-320.jpg)
Reactive Programming for Real Use Cases
- 1. @alexsotob Reactive Programming for Real Use Cases Alex Soto Director of Developer Experience Red Hat (@alexsotob)
- 2. @alexsotob 2 Buenas tardes, buenas noches, señoritas y señores To be here with you tonight. Brings me joy, que alegria — Miguel “
- 3. @alexsotob 3 Who Am I? Alex Soto
- 4. @alexsotob System extensions Programming Manifesto Streams Asynchrony Resilience Elasticity Back-Pressure Spreadsheets Actor Events Messages Data Flows RX Java Responsiveness Fibers Non- Blocking Reactor Spring MicroProfile REACTIVE ALL THE THING R-Socket
- 5. @alexsotob5 What's this? The streets are lined with Little creatures laughing. — Jack Skellington “
- 6. @alexsotob Click events on steroids
- 7. @alexsotob C CC C C C click stream C CC C CC double click stream buffer(100ms) C C CC double clicks stream filter >=2 subscribe executes everything
- 8. @alexsotob Event-Driven => Concurrent Applications Build concurrent applications Reactive programming Reactive streams Non-Blocking Asynchronous Non-Blocking IO (Netty) Reactive Framework Application Code Callbacks, RX Java, Reactor, Co-routines... } 1 Thread -> n concurrent tasks
- 10. @alexsotob From Event-Driven to Systems
- 11. @alexsotob Reactive => Responsive RESPONSIVE ASYNC MESSAGE PASSING ELASTICITY RESILIENCE
- 12. @alexsotob Async != multi-thread Async == never-block
- 13. @alexsotob Asynchronous & Non-Blocking execution model Ideal world Task A Task B Task C Real world Blocking I/O Asynchronous execution
- 14. @alexsotob Containers are about sharing and deployment density Container Host Threads costs memory cost lots of memory cost CPU cycles + quotas = BOOM The hidden truth of containers
- 15. @alexsotob 2020
- 16. @alexsotob16 On an island that I own Tan and rested and alone Surrounded by enormous piles of money — Eugene “
- 17. @alexsotob17 I just don’t see how a world that makes such a wonderful things could be bad? — Ariel “
- 19. @alexsotob Quarkus = (Imperative + Reactive)/Reactive Eclipse Vert.x / Netty Undertow (Servlet) RESTEasy (JAX-RS) Reactive Routes Reactive Messaging Reactive Data Access EventsMessages HTTP
- 21. @alexsotob Pagination Flowable<List<Beer>> beerStream = Flowable.generate(() -> 1, (page, emitter) -> { final List<Beer> beers = beerGateway.getBeers(page); if (beers.isEmpty()) { emitter.onComplete(); } else { emitter.onNext(beers); } return page + 1; }); return beerStream .flatMap(Flowable::fromIterable); Initial Page Get Beers Emit Beers of Finish Iterate to the next page Individual Beer Is Emitted
- 22. @alexsotob Pagination @GET @Path("/all") @Produces(MediaType.APPLICATION_JSON) public Publisher<Beer> getBeers() { return beerservice.beers() .filter(b -> b.getAbv() > 10.0); } ~Thread Get Beers Streams Stream Operation
- 24. @alexsotob Parallel Requests public Flowable<JsonValue> compareBeers(String beerA, String beerB) { final Flowable<JsonObject> beerAInfo = beerGateway.getBeer(beerA) .map(array -> array.get(0)) .map(this::filterContent); final Flowable<JsonObject> beerBInfo = beerGateway.getBeer(beerB) .map(array -> array.get(0)) .map(this::filterContent); return beerAInfo.zipWith(beerBInfo, this::compare); } Get Beer Async Get Important Fields When Both Operations Finishes Execute Comparison
- 25. @alexsotob25 A hundred thousand things to see (Hold your breath, it gets better) — Jasmine & Aladdin “
- 26. @alexsotob26 Don’t you know there’s part of me that longs to go… Into the Unknown — Elsa “
- 27. @alexsotob HTTP => Strong Coupling
- 28. @alexsotob HTTP => Uptime Coupling
- 29. @alexsotob HTTP => Strong Coupling C B C B C B C B C B C B
- 31. @alexsotob Data at Rest => Data At Motion Message Stream Publish/ Subscribe Request-Reply
- 32. @alexsotob Quarkus = {HTTP, Messaging, Streaming} Messaging / Streaming Quarkus Application Code Container Host / Operating System NIO HTTP Messaging Quarkus Application Code Container Host / Operating System Messaging Middleware
- 33. @alexsotob Quarkus = {HTTP, Messaging, Streaming} MicroProfile Reactive Messaging Quarkus Application Code Container Host / Operating System NIO HTTP Messaging Quarkus Application Code Container Host / Operating System Messaging Middleware * * Kafka or any other messaging system.
- 34. @alexsotob Music Charts Player Top Music Chart Player Top Music Chart HTTP Dashboard Song Played * play music musicplay
- 35. @alexsotob REST to Messaging @Inject @Channel("orders") Emitter<String> orders; public Order enqueue(Order order) { orders.send(jsonb.toJson(order)); return order; } Send “data” to the channel “orders”
- 36. @alexsotob Processing Messages @Incoming("orders") @Outgoing("queue") public CompletionStage<String> prepare(String message) { Order order = fromJson(message, Order.class); return makeIt(order) .thenApply(beverage -> PreparationState.ready(order, beverage) ); } Read from “orders” Write to “queue” Process data async*
- 37. @alexsotob37 A hundred thousand things to see (Hold your breath, it gets better) — Jasmine & Aladdin “
- 38. @alexsotob38 Put on your Sunday clothes there's lots of world out there. — Wall-E “ [https://github.com/lordofthejars/rp4rp]
- 39. @alexsotob39 What's the lesson? What is the take-away? — Maui “
- 40. @alexsotob40 Quarkus = {HTTP, Messaging, Streaming} HTTP, Messaging, Streaming Quarkus Non-Blocking IO
- 41. @alexsotob41 WHAT ABOUT REACTIVE STREAMS? @Channel(“foo”) Emitter @Incoming(“foo”) @Outgoing(“bar”) @Channel(“bar”) Publisher @Outoing(“foo”) @Incoming(“bar”) Publisher Processor Subscriber Connector Connector
- 42. @alexsotob Hay un amigo en mí, cuando salgan a volar, hay un amigo en mí — Toy Story “ @alexsotob [email protected] http://www.lordofthejars.com/ lordofthejars