Stack too deep

all classes

module Filter
  def before_filter name
    @@filter = name
  end

  def method_added name
    return if @filtering # Don't add filters to original_ methods
    return if @@filter == name # Don't filter filters

    @filtering = true

    alias_method :"original_#{name}", name
    define_method name do |*args|
      self.send @@filter, name
      self.send :"original_#{name}", *args
    end
    @filtering = false
  end
end

# base class for all GW's events
class GwEvent
  extend Filter
  before_filter :prefix_msgs

  def prefix_msgs name
    @msg_prefix = "#{self.class}::#{name}"
  end
end

class SkrillEvent < GwEvent
  include Participant

  def initialize(event, ctx=nil)
    @event = event
    @step = event[:start_from_step].present? ? event[:start_from_step] : 0
    @ctx = ctx
  end

end


class SkrillProcessedEvent < SkrillEvent
  include Participant

  def baz
    puts "#{@msg_prefix} message goes here"
  end

  def initialize(event)
    super(event)

  end
end



sk = SkrillProcessedEvent.new({})
sk.baz

I get 
Uncaught exception: stack level too deep
  /Users/ohad/.rvm/gems/ruby-1.9.3-p327@financial-service/gems/rack-1.4.1/lib/rack/builder.rb:40

Process finished with exit code 0