return urlQueueList.poll();
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * org.codelibs.fess.crawler.service.UrlQueueService#saveSession(java.lang.String)
     */
    @Override
    public void saveSession(final String sessionId) {
        // NOP
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.service.UrlQueueService#visited(UrlQueue)

     * @return The URL queue.
     */
    QUEUE poll(String sessionId);

    /**
     * Saves the session.
     *
     * @param sessionId The session ID.
     */
    void saveSession(String sessionId);

    /**
     * Checks if a URL has been visited.
     *
     * @param urlQueue The URL queue.
     * @return true if the URL has been visited, otherwise false.
     */

            }

            @Override
            public UrlQueue<?> poll(String sessionId) {
                return null;
            }

            @Override
            public void saveSession(String sessionId) {
            }

            @Override
            public boolean visited(UrlQueue<?> urlQueue) {
                return false;
            }

            @Override

        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) {

        boolean result = service.visited(newUrl);

        // Verify
        assertFalse(result);
    }

    public void test_saveSession() {
        // Execute - should be a no-op
        service.saveSession("session123");

        // No verification needed as it's a no-op method
    }

    public void test_generateUrlQueues() {
        // Setup
        String previousSessionId = "prevSession";

    }

    /**
     * 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.
     *