gistfile1.rb

class SomeFastJob
  @queue = :high

  def self.perform
    fast_stuff
  end
end

class SomeSlowJob
  @queue = :low

  def self.perform
    slow_stuff
  end
end

module Job
  extend self

  def enqueue(klass, *args)
    if live_queue?
      Resque.enqueue(klass, *args)
    else
      klass.perform(*args)
    end
  end

  def live_queue?
    Merb.env =~ /production/
  end
end

gistfile2.rb

gistfile3.rb