'Add a controller class to this application. A controller class has
methods which handle web requests. To connect a URL to a controller\'s
method use `add_route`.'

def add_ui_controller(self, controller_name, controller):

    log.debug("Enabling    '%s'    controller,    class:    %s", controller_name, controller.__class__.__name__)
    self.controllers[controller_name] = controller
