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Vert.x keynote for EclipseCon 2013
- 1. Vert.x - Polyglot AsynchronousApplications Tim Fox Vert.x Project Lead Red Hat @timfox
- 2. What is Vert.x? ■ General purpose application platform ■ Superficially similar to Node.js – but not a clone! ■ Asynchronous APIs ■ Polyglot – mix and match Java, JavaScript/CoffeeScript, Ruby, Groovy and Python (others to follow). ■ Simple but not Simplistic ■ Part of the new breed of application platforms
- 3. Project Info ■ Independent Community Project ■ Hopefully moving to the Eclipse Foundation soon! ■ 100% open source (ASL 2.0 + Creative Commons) ■ 9th most watched Java project on github https://github.com/languages/Java/most_watched
- 4. Core APIs ■ TCP/SSL clients and servers ■ HTTP/HTTPS clients and servers – including WebSockets ■ File system ■ Event bus ■ 100% asynchronous ■ Don't call us, we'll call you!
- 5. Core APIs ■ TCP/SSL clients and servers ■ HTTP/HTTPS clients and servers – including WebSockets ■ File system ■ Event bus ■ 100% asynchronous ■ Don't call us, we'll call you!
- 6. Basic web-server (JavaScript) load('vertx.js') vertx.createHttpServer().requestHandler(function(req) { var file = req.path === '/' ? 'index.html' : req.path req.response.sendFile(file) }).listen(8080)
- 7. Why Asynchronous? ■Many long lived connections are a feature of modern applications – Websockets, MQTT ■ OS threads are still a precious resource ■ Need to service many connections with small number of threads ■ Blocked OS threads means they can't do other work ■ But async APIs suck, right? ■ Use promises library like to “Flatten the Pyramid of Doom”
- 8. Threading model ■ Vert.x implements the Multi-Reactor Pattern ■ An event loop is an OS thread ■ Handles events for many handlers ■ Vert.x has multiple event loops. Typically one per core. ■ Don't block the event loop!
- 9. Hybrid Threading Model ■ Don't force everything to run on an event loop ■ Worker verticles can block ■ Communicate with other verticles by message passing. ■ Allows us to leverage the huge ecosystem of blocking Java libs
- 10. Concurrency ■ Vert.x components are single-threaded. ■ “Actor-style” concurrency. ■ Move away from 'Java-style' multi-threaded concurrency ■ No more synchronized, volatile or locking ■ Wave goodbye to many race conditions
- 11. Event Bus ■ The nervous system of Vert.x ■ Verticles communicate using the event bus. ■ Super simple API. ■ Point to point. Publish/Subscribe. Request/Response. ■ Pass simple strings, numbers or other primitive types. ■ JSON messages are preferred for structured data.
- 12. Event bus codeexample var handler = function(message) { console.log('Received message ' + message.msg) } vertx.eventBus.registerHandler('example.address', handler) vertx.setPeriodic(1000, function() { vertx.eventBus.send('example.address', {msg:'foo'}) })
- 13. Distributed Event Bus ■ Connects multiple Vert.x JVM instances ■ Forms a large distributed event space ■ Applications are loosely coupled components distributed across your network
- 14. Extend the EventBus to the Browser ■ Event bus extends to client side JavaScript too ■ Uses the same API on the client ■ Powerful distributed event space spanning both client and server nodes ■ Ideal for modern “real-time” web applications
- 15. Module system ■Verticles can be packaged into re-usable packages called modules ■ Modules can contain code in any of the Vert.x languages ■ Modules can live in the “usual” places. (Vert.x 2.0 - Maven Central, Nexus, etc) ■ Encourage an eco-system of Vert.x modules. ■ Empower the community ■ Keep the core project compact.
- 16. Examples of modules ■ JDBC ■ MongoDB ■ Redis ■ AMQP ■ Mailer ■ Work queues ■ Session Manager ■ Web framework ■ Rhino, DynJS, Groovy, JRuby, Jython, Scala, Clojure, etc
- 17. Easy Developer Experience Vert.x 2.0: ■ Gradle template project ■ Maven archetype and plugins ■ Zero setup IDE debugging ■ Zero setup IDE testing
- 18. Introducing DynJS ■New 100% InvokeDynamic JavaScript implementation for the JVM ■ Authors part of same polyglot team at Red Hat ■ DynJS language module for Vert.x
- 19. Node.js Compatibility ■Run Node.js apps on Vert.x ■ Node.js support using DynJS ■ Migration path to Vert.x + V8 Vert.x +
- 20. Summary ■ Write apps as set of loosely coupled components that live anywhere ■ Polyglot – use the language(s) you want ■ Simple concurrency – wave goodbye to most race conditions ■ Leverage existing Java library ecosystem ■ Module system – empower the community ■ Run Node.js apps too We believe Vert.x is the platform for the new generation of polyglot web and enterprise applications
- 21. Summary ■ Write apps as set of loosely coupled components that live anywhere ■ Polyglot – use the language(s) you want ■ Simple concurrency – wave goodbye to most race conditions ■ Leverage existing Java library ecosystem ■ Module system – empower the community ■ Run Node.js apps too We believe Vert.x is the platform for the new generation of polyglot web and enterprise applications
- 22. Get involved! ■ Loads more to do ■ Very small team! ■ Github: https://github.com/vert-x/vert.x ■ Google group: vertx ■ IRC channel: #vertx on freenode.net
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