def METHOD_NAME(self):
    """
    Returns true if data is buffered and ready to be read from this
    feeder.  A ``False`` result does not mean that the feeder has closed;
    it means you may need to wait before more data arrives.
    :return:
        ``True`` if a `read` call would immediately return at least one
        byte; ``False`` otherwise.
    """
    self._lock.acquire()
    try:
        if len(self._buffer) == 0:
            return False
        return True
    finally:
        self._lock.release()