def Stop(self):
    """Stops the emulator instance."""
    if not self.__running:
      return
    logging.info('shutting down the emulator running at %s', self._host)
    headers = {'Content-length': '0'}
    response, _ = self._http.request('%s/shutdown' % self._host,
                                     method='POST', headers=headers)
    if response.status != 200:
      logging.warning('failed to shut down emulator; response: %s', response)

    self.__running = False
    # Delete temp files.
    shutil.rmtree(self._tmp_dir)
Stops the emulator instance.