Максим Сабарня и Иван Дрижирук “Vert.x – tool-kit for building reactive applications on the JVM”

1. tool-kit for building reactive
applications on the JVM
Ivan Drizhiruk
Maxim Sabarnya

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Problems of enterprise solutions
● Multithreading programming
● Communication client/server
● Large application architecture
● Scalability
● Management
● Performance

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Multithreading programming

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Vert.x Event loop

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Vert.x Event loop

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Vert.x Event Bus

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Vert.x Event Bus
eventBus.
publish("news.ua.sport", "Yay! Someone kicked a ball");
eventBus.
send("news.ua.sport", "Yay! Someone kicked a ball",
Handler<? extends Message> handler);
eventBus
.registerHandler(
"news.ua.sport",
Handler<? extends Message> handler);

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Verticles / Workers / Event bus
● A verticle never gets executed by more than one thread concurrently
● No race conditions, no deadlocks. You write your code as single threaded
● Never block event loop
● Use workers
● Asynchronous model
● Verticles are isolated by separate class loaders
● Send - for one listener, publish - for all listeners

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Communication client/server

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Event Bus Bridge

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Event Bus Bridge
<script src="vertxbus-2.1.js"></script>
var eventBus = new vertx.EventBus('//domainexample/testapp/eventbus');
eventBus.send(address, message, replyHandler);
eventBus.publish(address, message)
eventBus.registerHandler(address, handler);

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ServerHook
public interface EventBusBridgeHook {
boolean handleSocketCreated(SockJSSocket sock);
void handleSocketClosed(SockJSSocket sock);
boolean handlePreRegister(SockJSSocket sock, String address);
void handlePostRegister(SockJSSocket sock, String address);
boolean handleUnregister(SockJSSocket sock, String address);
boolean handleSendOrPub(SockJSSocket sock, boolean send, JsonObject msg, String address);
boolean handleAuthorise(JsonObject message, String sessionID,
Handler<AsyncResult<Boolean>> handler);
}

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Large application architecture

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Large application architecture

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Architecture - microservices

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Vert.x Modules
● Package verticles into re-usable modules
● Simply a zip containing module definition, code and
resources
● Modules can be “zip” artifacts released in Maven
Central
● Vert.x web site maintains a listing of Vert.x modules

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Pain
● Content assist in IDE don’t work for busmod APIs

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Pain
● You often find yourself tracing errors in the busmods,
which can be difficult because the stack trace stops at
message passing

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Pain
● Hell of anonymous inner class callbacks
vertx.eventBus().registerHandler(EVENT_LOG, new Handler<Message>() {
@Override
public void handle(Message message) {
vertx.eventBus().send(CASSANDRA_CLIENT, message.body(), new Handler<Message>() {
@Override
public void handle(Message event) {
message.reply(true);
}
});
}
});

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Pain
● Hell of anonymous inner class callbacks
vertx.eventBus().registerHandler(EVENT_LOG,
inMessage -> vertx.eventBus().send(CASSANDRA_CLIENT, inMessage.body(),
event -> inMessage.reply(true)));
});

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Pain
● Custom objects from shared memory can’t be used in
different verticles
Obj Cucumber ≠ Obj Cucumber

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Pain
● Changing standard behaviour

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Development process
Run Mode
● java
● html
● js
{
"main":"ua.dp.ardas
.EntryPointVerticle",
"auto-redeploy": true
}
src/main/resources/mod.json

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Development process
You can use Vert.x with multiple languages
● Java
● JavaScript
● Groovy
● Ruby.

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History
● 17/06/11 - First commit in project "Node.x"
● 09/05/12 - Vert.x 1.0 final released
● 17/07/13 - Vert.x 2.0 final released
● 08/13 - Vert.x joins Eclipse Foundation
● 05/14 - Vert.x won the award for "Most Innovative Java
Technology" at the JAX Innovation awards
● 13/11/14 - Vert.x 2.1.5 released
● 24/06/15 - Vert.x 3.0.0 released

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Performance

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Performance

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Example - chat

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Who’s using Vert.x ?

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Summary
The platform for modern web and enterprise application
development.
● The best choice for new generation of rich client apps
● Polyglot: Use the language you want
● Seamless scalability
● Simplicity and Power
● Top end performance

32. email: ivan.drizhiruk@ardas.ua
skype: ivan.drizhiruk
email: maxim.sabarnya@ardas.ua
skype: sabarnya.maxim
Questions?