gistfile1.rb

class Poller < Rails::Metal  
  def process(env)
    if env["PATH_INFO"] =~ /^\/poller_rack/                    
      return [200, {"Content-Type" => "text/html"}, ["Hello, World!"]]
    end
  end  
end


# Implementation:

module Rails
  class Metal
    def initialize(app, *args)  
      @app = app; @args = args
    end
        
    def call(env)
      if result = process(env)
        result
      else
        @app.call(env)
      end
    end             
    
    def process(env)
      false
    end
  end
end