def _load_cache(self):
        """Load existing cache and merge for updating if required."""
        if not self._disable_cache and os.path.exists(self._cache_path):
            _LOGGER.debug("Cache found at: %s", self._cache_path)
            loaded_cache = UTILS.load_cache(self._cache_path)

            UTILS.update(self._cache, loaded_cache)

        self._save_cache()
Load existing cache and merge for updating if required.