Delayed_job (or DJ) encapsulates the common pattern of asynchronously executing longer tasks in the background. It is a direct extraction from Shopify where the job table is responsible for a multitude of core tasks. This gem is backported from v3.0.0pre4 of collectiveidea's fork, to add named queues to v2.0.7 (http://github.com/ezpub/delayed_job).