The default implementation is a stdlib Queue (http://www.ruby-doc.org/stdlib/libdoc/thread/rdoc/Queue.html http://www.ruby-doc.org/stdlib/libdoc/thread/rdoc/Que

The default implementation is a stdlib Queue (http://www.ruby-doc.org/stdlib/libdoc/thread/rdoc/Queue.html http://www.ruby-doc.org/stdlib/libdoc/thread/rdoc/Queue.html) which will be consumed by a Rails::Queueing::ThreadedConsumer (https://github.com/rails/rails/blob/602000b/railties/lib/rails/queueing.rb#L34-63 https://github.com/rails/rails/blob/602000b/railties/lib/rai...). You just drop job objects into the queue, and the consumer thread will call #run on them.