Ruby Events? Maybe?

gistfile1.rb

class EventBus

  def self.publish event args
    @subscribers[event].each do |sub|
      # whatever meta stuff sends event to method on object (handler) :p
    end
  end

  def self.subscribe event, handler, method
    @subscribers[event] = { :handler => handler, :method => method }
  end

module EventHandler
  def subscribe event, method=:handle
    EventBus.subscribe event, self, method # self might be in the wrong context here, I'm ruby meta dumb
  end
end

class CustomerPreferredHandler
  include EventHandler

  subscribe :customer_preferred_event

  def handle customer_preferred_event_args
    # wutevs
  end
end

EventBus.send :customer_preferred_event, { :some => args }