Presentation based on moving real world Rails application to JRuby.

1. JRuby Everything in a single process Presentation based on moving real world Rails application to JRuby [email_address] ocher

3. Reasons to move to JRuby

4. Short JRuby servers description

5. Quartz Scheduler Integration

7. It's just Ruby on JVM

13. New feature in the App – long time, I/O bound task

14. Tens of concurrent requests

17. Very easy configuration

18. Run almost out of box

22. Server is down during that time

23. Use cluster if zero downtime deploys needed

31. Thread pool

32. quartz-jruby gem by Vagmi Mudumbai rewritten to support Quartz 2 and run out of box

33. Runs frequent jobs at almost no extra cost

34. jruby-quartz gem example require 'quartz' class TestScheduler include Quartz ::Scheduler schedule(:say_hello_5, :every => 5) { puts "every 5 seconds" } schedule(:say_hello_5_dc, :cron => "0/5 * * * * ? " , :disallow_concurrent => true ) do puts "no overlapping" sleep(8) # !!! end end TestScheduler .instance.run

35. Quartz – Rails integration # config.ru file # Stop current Quartz Scheduler instance during redeployment # QuartzTasksScheduler is a class which includes Quartz::Scheduler module # and defines jobs at_exit do if QuartzTasksScheduler .instance.scheduler.started? QuartzTasksScheduler .instance.scheduler.shutdown( true ) end end # Run quartz scheduler instance QuartzTasksScheduler .instance.run

40. Many more concurrent requests possible

41. Huge memory saving

42. No precise benchmark, but definitely not slower

44. http://torquebox.org/

45. https://github.com/trinidad/trinidad

46. https://github.com/strobecorp/kirk

47. https://github.com/ocher/quartz-jruby