https://github.com/rails/activejob/blob/master/lib/active_job/queue_adapters/queue_classic_adapter.rb#L9

https://github.com/rails/activejob/blob/master/lib/active_job/queue_adapters/sneakers_adapter.rb#L8

https://github.com/rails/activejob/blob/master/lib/active_job/queue_adapters/sucker_punch_adapter.rb#L8