Execute a blocking loop that runs and executes event callbacks
        until the connection is closed (e.g. by hitting Ctrl-C).

        While this method can be used to run Bokeh application code "outside"
        the Bokeh server, this practice is HIGHLY DISCOURAGED for any real
        use case.

def loop_until_closed(self):
        ''' Execute a blocking loop that runs and executes event callbacks
        until the connection is closed (e.g. by hitting Ctrl-C).

        While this method can be used to run Bokeh application code "outside"
        the Bokeh server, this practice is HIGHLY DISCOURAGED for any real
        use case.

        '''
        if isinstance(self._state, NOT_YET_CONNECTED):
            # we don't use self._transition_to_disconnected here
            # because _transition is a coroutine
            self._tell_session_about_disconnect()
            self._state = DISCONNECTED()
        else:
            def closed():
                return isinstance(self._state, DISCONNECTED)
            self._loop_until(closed)