Let say that this is a scenario

##

@@algorithm_path = "myRoutingAlgorithm.rb"

Class Node
   attr_reader :message
   @message
   def add(msg)
     @message=msg
   end
end

Class Router
   def self.route_to(from, destination)
      #find the next node at the path in the way to node 'destination'
      #if i'm alredy at node 'from'
      # ...
      return #something
   end
end

start = Node.new
a = Node.new
b = Node.new
c = Node.new
end = Node.new

#forward the message from start to the first
#hop in the way to the end
Router.route_to(start, end).add(start.message)

##

Here is the question.
The user must give the path to a file where is the
routing algorithm.  How do I include that file and
use the Router class as an interface?

This is becouse i'm coding a network routing simulator