* </p>
 *
 * <p>
 * It also provides thread-local storage for sitemaps, allowing each thread to have its own set of sitemaps.
 * </p>
 */
public class CrawlerContext {
    /**
     * Constructs a new CrawlerContext.
     */
    public CrawlerContext() {
        // Default constructor
    }

    /**
     * Session identifier for the crawling session.
     */
    protected String sessionId;

    /**

    @Override
    protected void processCrawlingException(final Object... objs) {
        try {
            final CrawlerContext crawlerContext = (CrawlerContext) objs[0];
            final UrlQueue<?> urlQueue = (UrlQueue<?>) objs[1];
            final Throwable e = (Throwable) objs[2];

            storeFailureUrl(crawlerContext, urlQueue, e.getClass().getCanonicalName(), e);
        } catch (final ContainerNotAvailableException e) {

     * Otherwise, the provided {@code crawlerContext} is set in the thread-local storage.
     *
     * @param crawlerContext the {@link CrawlerContext} to be set for the current thread, or {@code null} to remove the context.
     */
    public static void setCrawlerContext(final CrawlerContext crawlerContext) {
        if (crawlerContext == null) {
            ROBOT_CONTEXT_THREAD_LOCAL.remove();

            assertNotSame(crawler1.crawlerContext, crawler2.crawlerContext);

            for (int i = 0; i < 100; i++) {
                if (crawler1.crawlerContext.getStatus() == CrawlerStatus.RUNNING) {
                    break;
                }
                Thread.sleep(50);
            }
            assertEquals(CrawlerStatus.RUNNING, crawler1.crawlerContext.getStatus());