Introduction To Delayed Job

"Maybe we should have a talk on delayed_job" @subelsky

An Introduction to delayed_job @bmoreonrails 2009-11-10

I’m @jonathanjulian

Why do we need background processing?

User Experience

Sending an email

Resizing an image

Updating a web service

Geocoding

Batch import

Delayed::Job “Extracted from Shopify” database-persisted queue 0..n runners

tobi/delayed_job

collectiveidea/delayed_job

The Queue

One db migration

Let’s delay something

Notifier.deliver_activation_instructions(self)

Notifier.send_later(:deliver_activation_instructions, self)

class Notifier def deliver_activation_instructions(user) # ... end handle_asynchronously :deliver_activation_instructions end

Custom jobs

class LongRunningJob < Struct.new(:id) def perform # do some crazy long calculations end end Delayed::Job.enqueue LongRunningJob.new(42)

Who runs the jobs?

Workers

rake jobs:work # Start a delayed_job worker.

script/delayed_job start * collectiveidea/delayed_job only

Production Deployment

# play nice with Passenger require 'delayed/recipes' after "deploy:update_code", "delayed_job:stop" after "deploy:restart", "delayed_job:start"

http://railstips.org/ 2008/11/19/delayed- gratiﬁcation-with-rails

"I highly recommend DelayedJob to anyone whose site is not 50% background work." @defunkt

@jonathanjulian http://jonathanjulian.com/

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Introduction To Delayed Job

by Jonathan Julian on Nov 10, 2009

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