DJ Remixes

A boat load of incredibly useful ‘plugins’ for Delayed::Job! DJ is a wonderful project and is incredibly useful, however it can be even more useful with just a few extras added in.

The Extras

• A proper ‘Worker’ class: DJ::Worker that accepts attributes.

• Callbacks

• Hoptoad support, if using Hoptoad.

• Priority settings

• Automatic re-enqueueing

• Better scheduling

• Unique jobs.

• more …

These are a few of the extras for DJ that are included here.

Installation

In your Gemfile add the following:

gem 'delayed_job', :git => 'git://github.com/collectiveidea/delayed_job.git'
gem 'dj_remixes', '>= 0.2.0'

Then install the gems:

$ bundle install

NOTE: At this time DJ Remixes requires the latest and greatest in the delayed_job master branch. When DJ 2.1.0 is officially released this requirement should go away.

Using

Basic Worker

class FooWorker < DJ::Worker

  def perform
    # do work
  end

end

FooWorker.enqueue

Unique Worker

Tell DJ to only allow one of this worker at a given time.

# We only want to charge the card once!
class PurchaseWorker < DJ::Worker
  is_unique

  def perform
    # charge the credit card...
  end
end

If the worker has an id attribute that then will be used in conjunction with the class name of the worker to form the unique key.

Priority

Tell DJ to run this worker with a higher priority than others.

class FooWorker < DJ::Worker
  priority :high

  def perform
    # do work
  end

end

FooWorker.enqueue

Re-Enqueueing

Tell DJ to re-enqueue this worker after it has successfully completely. NOTE: This will actually create a new DJ object in the database, not reuse the same one.

# Run every 30 days and charge a credit card.
class SubscriptionWorker < DJ::Worker
  re_enqueue

  def run_at
    30.days.from_now
  end

  def perform
    # charge the credit card...
  end
end

Attributes

The DJ::Worker class can accept attributes, similar to the way an ActiveRecord model can.

class FooWorker < DJ::Worker
  priority :high

  def perform
    # do work
    puts self.id # => 1
    puts self.person # => 'Mark Bates'
  end

end

worker = FooWorker.new(:id => 1, :person => 'Mark Bates')
worker.enqueue!

Contributors

• Mark Bates

• Stuart Garner

• Lars Pind