}

    /**
     * Saves the session state (currently not implemented).
     *
     * @param sessionId The session ID.
     */
    @Override
    public void saveSession(final String sessionId) {
        // TODO use cache
    }

    /**
     * Checks if a URL has been visited by looking in both the queue and access results.
     *

            // Do nothing in test
        }

        @Override
        public OpenSearchUrlQueue poll(String sessionId) {
            return null;
        }

        @Override
        public void saveSession(String sessionId) {
            // Do nothing in test
        }

        @Override
        public boolean visited(OpenSearchUrlQueue urlQueue) {
            return false;
        }

        if (logger.isInfoEnabled()) {
            logger.info("Crawler execution completed: sessionId={}, status={}", crawlerContext.sessionId, CrawlerStatus.DONE);
        }

        try {
            urlQueueService.saveSession(crawlerContext.sessionId);
            if (logger.isDebugEnabled()) {
                logger.debug("Saved crawler session: sessionId={}", crawlerContext.sessionId);
            }
        } catch (final Exception e) {