/**
 * Service interface for managing URL queues.
 * Provides methods for adding, retrieving, and managing URLs within a crawling session.
 *
 * @param <QUEUE> the type of URL queue
 */
public interface UrlQueueService<QUEUE extends UrlQueue<?>> {

    /**
     * Updates the session ID.
     *
     * @param oldSessionId The old session ID.
     * @param newSessionId The new session ID.
     */

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE components PUBLIC "-//DBFLUTE//DTD LastaDi 1.0//EN" 
	"http://dbflute.org/meta/lastadi10.dtd">
<components namespace="fessCrawler">
	<component name="urlQueueService"
		class="org.codelibs.fess.crawler.service.FessUrlQueueService">
		<arg>crawlerConfig</arg>
	</component>

import org.dbflute.utflute.core.PlainTestCase;

public class CrawlerTest extends PlainTestCase {

    public Crawler crawler;

    public DataService dataService;

    public UrlQueueService urlQueueService;

    public FileTransformer fileTransformer;

    private StandardCrawlerContainer container;

    @Override
    protected void setUp() throws Exception {
        super.setUp();

 * It uses various services and components, such as {@link UrlQueueService}, {@link DataService},
 * {@link CrawlerContainer}, {@link LogHelper}, {@link CrawlerClientFactory}, and {@link CrawlerContext},
 * to perform its tasks.
 * </p>
 *
 * <p>
 * The crawling process involves the following steps:
 * </p>
 * <ol>
 *   <li>Fetching a URL from the queue using {@link UrlQueueService#poll(String)}.</li>

        }

        urlQueueService.offerAll(sessionId, urlQueueList);

        // Poll - items should be ordered by weight (descending)
        final OpenSearchUrlQueue first = urlQueueService.poll(sessionId);
        assertNotNull(first);
        // Weight should be highest
        assertTrue(first.getWeight() >= 1);

        urlQueueService.delete(sessionId);
    }

public class CrawlerTest extends LastaDiTestCase {

    @Resource
    private Crawler crawler;

    @Resource
    private DataService dataService;

    @Resource
    private UrlQueueService urlQueueService;

    @Resource
    private FileTransformer fileTransformer;

    @Resource
    private CrawlerContainer crawlerContainer;

    @Override
    protected String prepareConfigFile() {
        return "crawler.xml";

     *
     * @param urlQueueService the UrlQueueService instance to be set, or null to remove the current instance
     */
    public static void setUrlQueueService(final UrlQueueService<UrlQueue<?>> urlQueueService) {
        if (urlQueueService == null) {
            URL_QUEUE_SERVICE_THREAD_LOCAL.remove();
        } else {
            URL_QUEUE_SERVICE_THREAD_LOCAL.set(urlQueueService);
        }
    }

    /**

import org.codelibs.fess.crawler.entity.UrlQueueImpl;
import org.codelibs.fess.crawler.helper.MemoryDataHelper;
import org.codelibs.fess.crawler.service.UrlQueueService;

import jakarta.annotation.Resource;

/**
 * Implementation of the {@link UrlQueueService} interface.
 * This class provides methods for managing a queue of URLs to be crawled,
 * including adding, deleting, and retrieving URLs from the queue.

import org.codelibs.fess.crawler.service.UrlQueueService;
import org.dbflute.utflute.core.PlainTestCase;

/**
 * Test case for CrawlerThread class.
 */
public class CrawlerThreadTest extends PlainTestCase {

    private CrawlerThread crawlerThread;
    private CrawlerContext crawlerContext;
    private UrlQueueService<UrlQueue<?>> urlQueueService;
    private DataService dataService;

    public void test_urlQueueService_setAndGet() {
        // Initially should be null
        assertNull(CrawlingParameterUtil.getUrlQueueService());

        // Create a mock UrlQueueService
        UrlQueueService<UrlQueue<?>> service = new UrlQueueService<UrlQueue<?>>() {
            @Override
            public void updateSessionId(String oldSessionId, String newSessionId) {
            }

            @Override