Brief introduction into EventMachine by Jonathan Weiss presented at RailsCamp 4 in Cologne (03.07.2010)

1. EventMachine
Yes, that’s NodeJS in Ruby
Jonathan Weiss
02.07.2010

2. EventMachine
„Event-driven I/O using the reactor pattern“
http://rubyeventmachine.com/
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3. Goals
Scalable and performant but low-level I/O library
API that removes threaded complexety
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4. Install
$ sudo gem install eventmachine
Works with Ruby, Rubinius, and JRuby
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5. Use EventMachine
$ sudo gem install eventmachine
Works with Ruby, Rubinius, and JRuby
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6. Echo Server
$ sudo gem install eventmachine
Works with Ruby, Rubinius, and JRuby
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7. Low Level HTTP Client
$ sudo gem install eventmachine
Works with Ruby, Rubinius, and JRuby
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8. EM::HttpRequest
$ sudo gem install eventmachine
Works with Ruby, Rubinius, and JRuby
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9. Simple Timer
$ sudo gem install eventmachine
Works with Ruby, Rubinius, and JRuby
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10. Simple Timer
$ sudo gem install eventmachine
Works with Ruby, Rubinius, and JRuby
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11. Protocol Support
TCP (+ SSL) FileWatcher
HTTP(s) / WebSocket Timer
Memcached PeriodicTimer
SASLauth ProcessWatch
Postgres3 SpawnedProcess
SMTP Queue
Sock4
Stomp
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12. Higher Level APIs on top
AMQP
Nanite
MySQL
DNS
Redis
MongoDB
HTTPRequest
WebSocket
Amazon S3 12

13. Happening: S3 + EventMachine
$ sudo gem install eventmachine
Works with Ruby, Rubinius, and JRuby
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14. Why you want async:
Uploading 100 x 2 MB files:
RightAWS vs. Happening
10min vs. 5:40min
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15. EventMachine vs. NodeJS
EventMachine NodeJS
Engine Ruby V8
Available Libraries All Ruby libs, gems, … Only NodeJS libs
Possibility to block YES NO
Coding Style Callbacks, Callbacks
Procedural with fibers
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16. EM::Synchrony – 1.9 Fibers
$ sudo gem install eventmachine
Works with Ruby, Rubinius, and JRuby
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17. Q&A
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