Максим Сабарня и Иван Дрижирук “Vert.x – tool-kit for building reactive applications on the JVM”
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This document discusses Vert.x, an open source tool-kit for building reactive applications on the JVM. It addresses common problems with enterprise solutions like multithreading, scalability and performance. Vert.x uses an event-driven architecture with non-blocking code and an event bus for communication. It allows building distributed systems as microservices with modules that can be deployed on servers or clients. While powerful, it also presents challenges around debugging, callbacks and sharing objects between verticles.
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
- 2. +380 (63) 223-17-47 • ardas.ua Problems of enterprise solutions ● Multithreading programming ● Communication client/server ● Large application architecture ● Scalability ● Management ● Performance
- 3. +380 (63) 223-17-47 • ardas.ua Multithreading programming
- 4. +380 (63) 223-17-47 • ardas.ua
- 5. +380 (63) 223-17-47 • ardas.ua Vert.x Event loop
- 6. +380 (63) 223-17-47 • ardas.ua Vert.x Event loop
- 7. +380 (63) 223-17-47 • ardas.ua Vert.x Event Bus
- 8. +380 (63) 223-17-47 • ardas.ua 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);
- 9. +380 (63) 223-17-47 • ardas.ua 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
- 10. +380 (63) 223-17-47 • ardas.ua Communication client/server
- 11. +380 (63) 223-17-47 • ardas.ua Event Bus Bridge
- 12. +380 (63) 223-17-47 • ardas.ua 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);
- 13. +380 (63) 223-17-47 • ardas.ua 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); }
- 14. +380 (63) 223-17-47 • ardas.ua Large application architecture
- 15. +380 (63) 223-17-47 • ardas.ua Large application architecture
- 16. +380 (63) 223-17-47 • ardas.ua Architecture - microservices
- 17. +380 (63) 223-17-47 • ardas.ua 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
- 18. +380 (63) 223-17-47 • ardas.ua Pain ● Content assist in IDE don’t work for busmod APIs
- 19. +380 (63) 223-17-47 • ardas.ua Pain ● You often find yourself tracing errors in the busmods, which can be difficult because the stack trace stops at message passing
- 20. +380 (63) 223-17-47 • ardas.ua 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); } }); } });
- 21. +380 (63) 223-17-47 • ardas.ua Pain ● Hell of anonymous inner class callbacks vertx.eventBus().registerHandler(EVENT_LOG, inMessage -> vertx.eventBus().send(CASSANDRA_CLIENT, inMessage.body(), event -> inMessage.reply(true))); });
- 22. +380 (63) 223-17-47 • ardas.ua Pain ● Custom objects from shared memory can’t be used in different verticles Obj Cucumber ≠ Obj Cucumber
- 23. +380 (63) 223-17-47 • ardas.ua Pain ● Changing standard behaviour
- 24. +380 (63) 223-17-47 • ardas.ua Development process Run Mode ● java ● html ● js { "main":"ua.dp.ardas .EntryPointVerticle", "auto-redeploy": true } src/main/resources/mod.json
- 25. +380 (63) 223-17-47 • ardas.ua Development process You can use Vert.x with multiple languages ● Java ● JavaScript ● Groovy ● Ruby.
- 26. +380 (63) 223-17-47 • ardas.ua 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
- 27. +380 (63) 223-17-47 • ardas.ua Performance
- 28. +380 (63) 223-17-47 • ardas.ua Performance
- 29. +380 (63) 223-17-47 • ardas.ua Example - chat
- 30. +380 (63) 223-17-47 • ardas.ua Who’s using Vert.x ?
- 31. +380 (63) 223-17-47 • ardas.ua 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: [email protected] skype: ivan.drizhiruk email: [email protected] skype: sabarnya.maxim Questions?