Netty - a pragmatic introduction

presentation for the 53rd JSUG Vienna meeting

1. Netty.io
a pragmatic introduction
(live coding https://github.com/raphaelstary/jsug-netty-example)

2. Raphael Stary
- software dev
(w/ focus on html5, js, java, (java ee), ux, agile,
software craftsmanship)

- founder of letsplay.io - open web game
studio

twitter: @RaphaelStary
facebook.com/RaphaelStary
github.com/RaphaelStary
xing.com/profile/Raphael_Stary

3. what's netty?
Netty is a NIO client server
framework which enables
quick and easy development
of network applications such
as protocol servers and
clients.

4. live coding :)
https://github.com/raphaelstary/jsug-netty-example

5. companies
- Red Hat
- Twitter
- Facebook
- Boundary
- Typesafe
...

6. open source projects
- HornetQ
- Infinispan
- Vert.x
- Play Framework
- Finangle
- Cassandra
...

7. it's asynchronous ...
- no blocking IO
- share Threads across many
connections

8. OIO
socket
read/write
Thread
socket
read/write
Thread
socket
read/write
Thread
socket
read/write
Thread

9. NIO
socket
read/write
socket
read/write
socket
read/write
Thread
socket
read/write
selector

10. blocking IO scales not that good ...
- a Thread takes memory from 256kb to 1mb
for the stack space

- it's good with <1000 connections (even better
latency than NIO)

- but >1000 concurrent connections use AIO or
NIO

11. netty transports
- NIO
- OIO
- AIO
- Local
- Embedded

12. supported protocols
- TCP
- UDP
- SCTP (linux only)
- UDT
- Serial

13. provided codecs
- HTTP
- Websocket
- SPDY
- Serialization
- JBoss Marshalling
- Protobufs
- SSL
- Zlib

14. how to get started
- MEAP preview




- http://netty.io/wiki/user-guide-for-4.x.html
- https://github.com/netty/netty/tree/master/example
- stackoverflow examples
- source code java docs

15. Netty
- http://netty.io
- https://github.com/netty/netty
- twitter: @netty_project