Vert.x Montreal JUG 2018

Transcript

1. Julien Ponge Thomas Segismont @jponge @tsegismont
2. Shameless plug
3. Reactive? (because resources are scarce)
5. Application
6. 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
7. 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"); } }
8. x 1000 = !
9. Virtual machines, Containers, etc
11. Vert.x? (async all the things!)
12. 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
13. & ' & Http server verticle Database client verticle  Event Bus ) ' “Details for user 1234?” “{data}” 4 instances 1 instance
14. Events Thread Event Loop & & & & &
15. (demo) Hello Vert.x
17. foo.a(1, res1 -> { if (res1.succeeded()) { bar.b("abc", 1, res2 -> { if (res.succeeded()) { baz.c(res3 -> { dosomething(res1, res2, res3, res4 -> { // (...) }); }); } }); } }); “Callback hell”
18. Callbacks RxJava 1 + 2 Quasar (vertx-sync) Kotlin coroutines (core) (codegen)
19. Boiler Vroom (in the mix)
20. (demo)
21. * ) WebMidi JSON / Event Bus
22. const eventBus = new EventBus("/eventbus") traktorIn.addListener("controlchange", 5, (event) => { eventBus.publish("boilervroom.vu-meter", { type: "volume-level", value: event.value }) }) eventBus.publish("boilervroom.fromtraktor", { type: "filter", number: 1, value: (event.value !== 0) }) Event Bus
23. + , - . IceCast VLC * Chrome / DJ Booth app Clients / NuProcess MIDI Event Bus Event Bus
24. SockJSHandler sockJSHandler = SockJSHandler.create(vertx); PermittedOptions permittedOptions = new PermittedOptions() .setAddressRegex(“boilervroom\\ ..+”); BridgeOptions bridgeOptions = new BridgeOptions() .addInboundPermitted(permittedOptions) .addOutboundPermitted(permittedOptions); sockJSHandler.bridge(bridgeOptions); router.route("/eventbus /*").handler(sockJSHandler);
25. + , - . IceCast VLC Clients / OGG/Vorbis OGG/Vorbis MP3 MP3 HTTP 1.0 HTTP 1.1 HTTP Client Event bus → Chunked HTTP
26. router.get("/audiostream").handler(context -> { HttpServerResponse response = context.response(); response.setStatusCode(200); response.setChunked(true); response.putHeader("Content-Type", "audio/mpeg"); MessageConsumer<Buffer> consumer = eventBus.consumer("boilervroom.audiostream"); consumer.bodyStream().handler(buffer -> { if (!response.writeQueueFull()) { response.write(buffer); } }); response.endHandler(v -> { consumer.unregister(); }); response.exceptionHandler(t -> { consumer.unregister(); }); });
27. Outro
28. 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)
29. https: //youtu.be/ZkWsilpiSqw 0 Applications réactives avec Eclipse Vert.x 1 Building Reactive Microservices in Java https: //goo.gl/ep6yB9 1 Guide to async programming with Vert.x for Java developers https: //goo.gl/AcWW3A
30. Q&A Use mlponge to get 50% off