worker.rb

module Worker
  ROLES = %w[admin manager].freeze

  def perform
    @role = ROLES.sample
    select_based_on_role
  end

  def select_based_on_role
    puts case @role
    when "admin"
      "i'm an admin"
    when "manager"
      "i'm a manager"
    end
  end
end

class BreadWorker
  include Worker
end
​
class CakeWorker
  include Worker
end

BreadWorker.new.perform