private static final long serialVersionUID = 1L;
        private int maxEmptyListCount = 10;

        @Override
        public Integer getIndexerWebfsUpdateIntervalAsInteger() {
            return 100;
        }

        @Override
        public Integer getIndexerWebfsMaxEmptyListCountAsInteger() {
            return maxEmptyListCount;
        }

        }

        executeTime = 0;
        documentSize = 0;

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

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getIndexerWebfsUpdateIntervalAsInteger();

    /**
     * Get the value for the key 'indexer.webfs.max.document.cache.size'. <br>
     * The value is, e.g. 10 <br>
     * comment: Maximum document cache size for webfs in the indexer.