1. Asynchronous IO with Vert.x
Peter Ledbrook - SpringSource

2. New kid on the block
Javascript Non-blocking Single-threaded
Reactor pattern
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3. What’s it about?
• C10K Problem
– How do you handle 10,000+ concurrent connections?
– Without grinding to a halt?
• Why?
– All those mobile devices!
– Rise of long-lived connections
Real-time chat
Instant messaging
Twitter
Voice and video
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4. Transloadit
• “Flexible, fast and scalable file uploading and encoding”
• Video/audio encoding on the fly
– 500mb/s
Transloadit
Video
Client S3/Cloudfiles/...
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5. Voxer
• Walkie-talkie for iOS and Android
• Live audio
• Large number of connections
• Push notifications
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6. Javascript and nothing but Javascript
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7. What if?
• Language neutral framework
• On the JVM
• Polyglot APIs
• Easy horizontal scalability
• Do non-eventy stuff in a non-eventy way
Vert.x!
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8. Vert.x
• Written in Java
• Built on Netty and NIO 2
– Java 7 only!
• Multiple language bindings
– JRuby
– Groovy
– Javascript
– Python/Clojure/Scala planned
• Based on the Reactor pattern
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9. How it works
Event loop
App registers Events trigger
handlers handlers
• Handlers executed synchronously
– on a single thread
• Use handlers to pass messages
• Inter/intra application comms
– EventBus with messages
– Safe shared data structures
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10. Features
• Non-blocking stdio
• TCP/IP and HTTP servers and clients
• Web Socket support
• (Non-blocking) Redis & Mongo modules (busmods)
• Asynchronous file system access and stream handling
Pump
ReadStream WriteStream
e.g.
HTTP Request AsyncFile
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11. Example - Echo socket
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12. Example - Echo client
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13. Scaling
App
instance
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14. Scaling
Vertx node
Event bus
App App App
instance instance instance
vertx run -instances 3
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15. Scaling
Hazelcast
Event bus
Vertx Vertx Vertx
node node node
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16. Extensibility via (Bus) Mods
Work Web ...
Mailer MongoDB
queue server
Event bus
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17. Mod structure
• Core mods in $VERTX_HOME/mods
• User mods in $VERTX_MODS
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18. A more complex example

19. Realtime logging app
Log messages
App
SockJS
Browser
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20. Realtime logging app
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21. Realtime logging app
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22. Realtime logging app
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23. Demo

24. Summary
• Event-driven framework for the JVM
– Low overhead
– Handle large number of connections
– Great for working with streams
• Pick your own language!
– Which will of course be Groovy ;)
• Published release: 1.0.1
– Still early days
– Get involved now!
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25. More info
• w: https://github.com/purplefox/vert.x
http://purplefox.github.com/vert.x/
• f: http://groups.google.com/group/vertx
• t: pledbrook
• b: http://blog.springsource.com/author/peter-ledbrook/
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26. Thank you!
Questions?
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