Method _clear_callbacks

python/python3/tornado/http1connection.py:305–315

Clears the callback attributes. This allows the request handler to be garbage collected more quickly in CPython by breaking up reference cycles.

(self)

        return True

    def _clear_callbacks(self) -> None:
        """Clears the callback attributes.

        This allows the request handler to be garbage collected more
        quickly in CPython by breaking up reference cycles.
        """
        self._write_callback = None
        self._write_future = None  # type: Optional[Future[None]]
        self._close_callback = None  # type: Optional[Callable[[], None]]
        if self.stream is not None:
            self.stream.set_close_callback(None)

    def set_close_callback(self, callback: Optional[Callable[[], None]]) -> None:
        """Sets a callback that will be run when the connection is closed.