module ActiveJob::QueueAdapter::ClassMethods

def queue_adapter=(name_or_adapter)

information.
is the +:async+ queue. See QueueAdapters for more
Specify the backend queue provider. The default queue adapter
def queue_adapter=(name_or_adapter)
  case name_or_adapter
  when Symbol, String
    queue_adapter = ActiveJob::QueueAdapters.lookup(name_or_adapter).new
    assign_adapter(name_or_adapter.to_s, queue_adapter)
  else
    if queue_adapter?(name_or_adapter)
      adapter_name = "#{name_or_adapter.class.name.demodulize.remove('Adapter').underscore}"
      assign_adapter(adapter_name, name_or_adapter)
    else
      raise ArgumentError
    end
  end
end