Procrastinate your code: Do it later.

Transcript

1. Procrastinate Your Code! Do it later Zach Moazeni Collective Idea

   Lonestar Ruby August 12, 2011 with Delayed Job and Resque

2. Background Processing

3. Request Response

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6. What’s the problem we’re solving?

7. Request Response

8. Serve a “Heavy” Response

9. “Punt” the work to someone else

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13. DelayedJob

14. Re-uses your existing database

15. “Is it ready to run? DO IT!” - DJ

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17. class Dog < ActiveRecord::Base def bark(when) ... end end Dog.find(1).delay().bark(2.hours.from_now)

18. Dog.find(1).delay().bark(2.hours.from_now) Works off an instance

19. class Dog < ActiveRecord::Base def bark(when) ... end handle_asynchronously :bark

    end Dog.find(1).bark(2.hours.from_now) calls .delay() for you
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21. Things I like about DelayedJob

22. 1) gem install delayed_job 2) rails generate delayed_job 3) rake

    db:migrate 4) rake jobs:work 5) Party!

23. Dog.find(1).delay( :run_at => 2.hours.from_now ).bark()

24. Automatically retries errors API is simple Heroku support!!

25. Resque

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27. “Anyone run this yet? DO IT!” - Resque

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29. class MyJob @queue = :background def self.perform(...) ... end end

    > Resque.enqueue(MyJob, ...) > QUEUE=* rake resque:work

30. Things I like about Resque

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32. class MyJob @queue = :background ... end class ImportantJob @queue

    = :important ... end > QUEUE=important,background rake resque:work
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36. Deploying Code

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42. Delayed Job: https://github.com/blog/ 229-dj-god Resque: https://gist.github.com/472092

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44. module MyApp class Application < Rails::Application config.autoload_paths << "#{Rails.root.to_s}/app/jobs" ...

    end end

45. http://airbrakeapp.com/

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53. People to Thank DelayedJob Tobias Lütke Collective Idea Brandon Keepers

    Matt Griffin Resque Chris Wanstrath Github Tons of Plugin Devs

54. Thank You! Questions? Zach Moazeni Collective Idea SpeakerRate http://speakerrate.com/talks/7825

55. Image Credits Kid Hiding: http://www.flickr.com/photos/bart_/1477582337/ Pizza in oven: http://failblog.org/2011/07/27/epic-fail-photos- classic-pizza-baking-fail/

    Phusion Passenger: http://www.modrails.com/ Bacon and Cheese Stuffed Pizza Burger: http:// www.epicmealtime.com/ Email: http://www.flickr.com/photos/m-c/2250563337/ spreadsheet: http://www.flickr.com/photos/jacobchristensen/ 162595896/ Image Grid: http://www.flickr.com/photos/leoboiko/ 3472849221/ Construction Worker: http://www.flickr.com/photos/jprod/ 5212302797/ Do it live: http://www.flickr.com/photos/torley/2578472833/ Queue: http://www.flickr.com/photos/richardsummers/ 269503769/ Heroku: http://www.heroku.com/ Redis: http://redis.io/ Traffic: http://www.flickr.com/photos/epsos/5591761716/ Lego Deployment: http://www.flickr.com/photos/elsie/4354094625/ Buddy Christ: http://www.flickr.com/photos/wishmerhill/389515893/ Monit Logo: http://mmonit.com/monit/ Wall Plug: http://www.flickr.com/photos/tolomea/4222795245/ Lego at Computer: http://www.flickr.com/photos/leftclicker/5874546452/ Live Roleplay: http://www.flickr.com/photos/nothakus/5526792671/ Blue Screen: http://www.flickr.com/photos/albertoalerigi/5711263109/ Fake Mobius Strip: http://www.flickr.com/photos/jgoforth/96136090/ Bunnies: http://www.flickr.com/photos/29278394@N00/696701369/ Pencil: http://www.flickr.com/photos/25073464@N05/2776574771/ Delorian: http://www.flickr.com/photos/codepo8/5114310672/ Square Peg: http://www.flickr.com/photos/epublicist/3546059144/