A Message Gateway

To see how we can apply these lofty ideals to real code, let’s imagine that we have been asked to build a message gateway. Our code will have the job of receiving messages and then sending them on to their final destinations. Messages look like this:

require 'uri'

class Message
  attr_accessor :from, :to, :body

  def initialize(from, to, body)
    @from = from
    @to = URI.parse(to)
    @body = body
  end
end