simple callbacks mixin

simple_callbacks.rb

# To use, simply define @__callbacks as a hash where the keys are events
# and the values respond to #call (e.g. lambdas, procs, methods)
#
# This implementation assumes you only have one callback per event, but
# you could use an array instead if you wanted
module SimpleCallbacks
  def run_callback(type, *args)
    @__callbacks[type].call(*args) if @__callbacks.has_key?(type)
  end
end