Procrastinate your code: Do it later.

You can't do it all. Sometimes breaking the request/response cycle is just too constraining and you need to bust out of it. Enter asynchronous processing.

Delayed Job and Resque, two takes at solving this problem, are popular tools. We'll explore their differences, demonstrate how to get up and running in minutes, and show you how to find the best fit for your project.

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
6. What’s the problem we’re solving?
7. Request Response
8. Serve a “Heavy” Response
9. “Punt” the work to someone else
13. DelayedJob
14. Re-uses your existing database
15. “Is it ready to run? DO IT!” - DJ
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
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
27. “Anyone run this yet? DO IT!” - Resque
29. class MyJob @queue = :background def self.perform(...) ... end end > Resque.enqueue(MyJob, ...) > QUEUE=* rake resque:work
30. Things I like about Resque
32. class MyJob @queue = :background ... end class ImportantJob @queue = :important ... end > QUEUE=important,background rake resque:work
36. Deploying Code
42. Delayed Job: https://github.com/blog/ 229-dj-god Resque: https://gist.github.com/472092
44. module MyApp class Application < Rails::Application config.autoload_paths << "#{Rails.root.to_s}/app/jobs" ... end end
45. http://airbrakeapp.com/
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/