/**
     * Data service for checking access results.
     */
    @Resource
    protected OpenSearchDataService dataService;

    /**
     * Cache for session queues.
     */
    protected Map<String, QueueHolder> sessionCache = new ConcurrentHashMap<>();

    /**
     * The number of URLs to fetch when polling.
     */
    protected int pollingFetchSize = 1000;

    /**

 *   crawler.close();
 * </pre>
 */
public class Crawler implements Runnable, AutoCloseable {

    private static final Logger logger = LogManager.getLogger(Crawler.class);

    /**
     * Service for managing URL queues during crawling.
     */
    @Resource
    protected UrlQueueService<UrlQueue<?>> urlQueueService;

    /**
     * Service for managing access result data.
     */
    @Resource

            finishedSessionIdList.add(sessionId);
        }
    }

    /**
     * Deletes all data associated with a specific crawler session.
     * Removes URL filters, URL queues, and access result data for the session.
     *
     * @param sessionId the session ID whose data should be deleted
     */
    private void deleteBySessionId(final String sessionId) {
        try {

        // Execute
        service.generateUrlQueues(previousSessionId, sessionId);

        // Verify
        assertEquals(2, newQueue.size());

        // Verify the generated queues have correct properties
        List<UrlQueueImpl<Long>> queueList = new ArrayList<>(newQueue);
        boolean foundPage1 = false;
        boolean foundPage2 = false;