public boolean isUpdateRequired(RepositoryMetadata metadata, ArtifactRepository repository, File file) {
        // Here, we need to determine which policy to use. Release updateInterval will be used when
        // the metadata refers to a release artifact or meta-version, and snapshot updateInterval will be used when
        // it refers to a snapshot artifact or meta-version.

            logger.debug("Starting indexUpdater.");
        }

        executeTime = 0;
        documentSize = 0;

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final long updateInterval = fessConfig.getIndexerWebfsUpdateIntervalAsInteger().longValue();
        final int maxEmptyListCount = fessConfig.getIndexerWebfsMaxEmptyListCountAsInteger();