Vert.x Montreal JUG 2018

Transcript

1. Julien Ponge Thomas Segismont
   @jponge @tsegismont
   

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2. Shameless plug
   

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3. Reactive?
   (because resources are scarce)
   

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5. Application
   

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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
   

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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");
   }
   }
   

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8. x 1000 =
   !
   

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9. Virtual machines,
   Containers, etc
   

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

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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
    

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13. &
    '
    &
    Http server verticle Database client verticle
    
    Event Bus
    )
    '
    “Details for user 1234?”
    “{data}”
    4 instances
    1 instance
    

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14. Events
    Thread
    Event Loop
    &
    &
    &
    &
    &
    

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15. (demo)
    Hello Vert.x
    

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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”
    

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18. Callbacks RxJava 1 + 2
    Quasar (vertx-sync)
    Kotlin coroutines
    (core)
    (codegen)
    

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19. Boiler Vroom
    (in the mix)
    

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20. (demo)
    

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21. *
    )
    WebMidi
    JSON / Event Bus
    

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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
    

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23. +
    ,
    -
    .
    IceCast
    VLC
    * Chrome / DJ Booth app Clients
    /
    NuProcess
    MIDI
    Event Bus
    Event Bus
    

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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);
    

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25. +
    ,
    -
    .
    IceCast
    VLC
    Clients
    /
    OGG/Vorbis
    OGG/Vorbis
    MP3
    MP3
    HTTP 1.0
    HTTP 1.1
    HTTP Client Event bus → Chunked HTTP
    

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26. router.get("/audiostream").handler(context -> {
    HttpServerResponse response = context.response();
    response.setStatusCode(200);
    response.setChunked(true);
    response.putHeader("Content-Type", "audio/mpeg");
    MessageConsumer 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();
    });
    });
    

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27. Outro
    

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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)
    

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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
    

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30. Q&A
    Use mlponge to get 50% off
    

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