* @param sessionId The session ID.
     * @return The list of compiled exclude patterns.
     * @throws CrawlerSystemException if the patterns cannot be loaded.
     */
    @Override
    public List<Pattern> getExcludeUrlPatternList(final String sessionId) {
        try {
            return excludeFilterCache.get(sessionId);
        } catch (final ExecutionException e) {
            throw new CrawlerSystemException(e);
        }
    }