module ActiveJob::QueueAdapter::ClassMethods

def interpret_adapter(name_or_adapter_or_class)
  case name_or_adapter_or_class
  when Symbol, String
    ActiveJob::QueueAdapters.lookup(name_or_adapter_or_class).new
  else
    if queue_adapter?(name_or_adapter_or_class)
      name_or_adapter_or_class
    elsif queue_adapter_class?(name_or_adapter_or_class)
      ActiveSupport::Deprecation.warn "Passing an adapter class is deprecated " \
        "and will be removed in Rails 5.1. Please pass an adapter name " \
        "(.queue_adapter = :#{name_or_adapter_or_class.name.demodulize.remove('Adapter').underscore}) " \
        "or an instance (.queue_adapter = #{name_or_adapter_or_class.name}.new) instead."
        name_or_adapter_or_class.new
    else
      raise ArgumentError
    end
  end
end

def queue_adapter
  _queue_adapter
end

def queue_adapter=(name_or_adapter_or_class)
  self._queue_adapter = interpret_adapter(name_or_adapter_or_class)
end

def queue_adapter?(object)
  QUEUE_ADAPTER_METHODS.all? { |meth| object.respond_to?(meth) }
end

def queue_adapter_class?(object)
  object.is_a?(Class) && QUEUE_ADAPTER_METHODS.all? { |meth| object.public_method_defined?(meth) }
end