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UW Advanced Rails Week 5
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Ben Woodall
April 30, 2015
Programming
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UW Advanced Rails Week 5
Ben Woodall
April 30, 2015
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Transcript
Questions from Week 4? 1
Week 5: Background Jobs Spring 2015 2
What are Background Jobs? 3
What are Background Jobs? Process that are run in the
background Independent from our Rails app 4
When should you use Background Jobs? 5
When should you use Background Jobs? 6
Long Running Requests/ Processes 7
Long Running Requests/ Processes HTTP requests outside of your app
Image/Video Processing 8
Tasks to be Run at a Later Date 9
Tasks to be Run at a Later Date Mailers Billing
Analytics Building Cleanup 10
How do Background Jobs Work? Queueing systems First In, First
Out (FIFO) 11
Active Job Introduced in Rails 4 Provides an interface for
queueing backends 12
Common Queueing Adapters Delayed Job github.com/collectiveidea/delayed_job Resque github.com/resque/resque Sidekiq http://sidekiq.org/
13
Delayed Job Pros Created by Shopify Very mature product. Well
maintained. Very simple to add, no external services Uses ActiveRecord for queueing 14
Delayed Job Cons Uses ActiveRecord for queueing Requires a separate
worker to check queues No Web-ui 15
Resque Pros Created by Github Well maintained. Asynchronous Doesn’t use
ActiveRecord Built in Web-ui Uses Redis 16
Resque Cons Harder to setup* Redis dependency 17
Sidekiq Pros Built in Web-ui Multi-threaded Uses Redis for queueing
18
Sidekiq Cons Harder to setup Redis dependency Thread Safety Not
Guaranteed! 19
Using Background Jobs in Shortener 20
Background Jobs Welcome Email Tweeting when creating links Weekly User
Stats 21
Adding sidekiq 22 Gemfile config/application.rb
Procfile with Foreman 23 Gemfile .foreman
Sidekiq Web View 24 Gemfile config/routes.rb
Sending Mail Later 25 app/controllers/users_controller.rb
Generate a Job 26
Twitter Job 27 app/controllers/links_controller.rb app/jobs/twitter_job.rb
Running Twitter Jobs 28 app/controllers/links_controller.rb
Failing Specs :( 29
30 specs/controllers/users_controller_spec.rb
31 app/controllers/links_controller_spec.rb
Cron Based Jobs 32 app/controllers/links_controller.rb config/schedule.rb
Cron Based Jobs 33 lib/tasks/email/weekly_tasks.rake