def _create_metadata_cache(cache_location):
    """Creates a new metadata cache instance appropriate for this platform.

    """
    cache_url = os.getenv('GUTENBERG_FUSEKI_URL')
    if cache_url:
        return FusekiMetadataCache(cache_location, cache_url)

    try:
        return SleepycatMetadataCache(cache_location)
    except InvalidCacheException:
        logging.warning('Unable to create cache based on BSD-DB. '
                        'Falling back to SQLite backend. '
                        'Performance may be degraded significantly.')

    return SqliteMetadataCache(cache_location)
def _create_metadata_cache ( cache_location ) : cache_url = os . getenv ( 'GUTENBERG_FUSEKI_URL' ) if cache_url : return FusekiMetadataCache ( cache_location , cache_url ) try : return SleepycatMetadataCache ( cache_location ) except InvalidCacheException : logging . warning ( 'Unable to create cache based on BSD-DB. ' 'Falling back to SQLite backend. ' 'Performance may be degraded significantly.' ) return SqliteMetadataCache ( cache_location )
Creates a new metadata cache instance appropriate for this platform.