# File lib/faye-rails/controller/channel.rb, line 20
      def monitor(event, &block)
        raise ArgumentError, "Unknown event #{event.inspect}" unless [:subscribe,:unsubscribe,:publish].member? event

        FayeRails.server(endpoint).bind(event) do |*args|
          Monitor.new.tap do |m|
            m.client_id = args.shift
            m.channel = args.shift
            m.data = args.shift
            m.instance_eval(&block) if FayeRails::Matcher.match? channel, m.channel
          end
        end
      end