Crawler crawler1 = container.getComponent("crawler");
crawler1.setSessionId("session1");
crawler1.addUrl("https://site1.com");

Crawler crawler2 = container.getComponent("crawler");  
crawler2.setSessionId("session2");
crawler2.addUrl("https://site2.com");

// Execute concurrently
crawler1.setBackground(true);
crawler2.setBackground(true);

String sessionId1 = crawler1.execute();
String sessionId2 = crawler2.execute();

        uqList.addAll(urlQueueList);
        urlQueueMap.put(sessionId, uqList);
    }

    /**
     * Removes the URL queue for the specified session ID.
     * @param sessionId the session ID
     */
    public synchronized void removeUrlQueueList(final String sessionId) {
        urlQueueMap.remove(sessionId);
    }

    /**
     * Clears all URL queues for all sessions.
     */

    public void delete(final String sessionId) {
        dataHelper.deleteAccessResultMap(sessionId);
    }

    /**
     * Deletes all access results from all sessions.
     */
    @Override
    public void deleteAll() {
        dataHelper.clearUrlQueueList();
    }

    /**
     * Gets an access result for the specified session and URL.
     *
     * @param sessionId the session ID
     * @param url the URL

    /**
     * Generates URL queues from a previous session's access results.
     * @param previousSessionId The previous session ID.
     * @param sessionId The current session ID.
     */
    @Override
    public void generateUrlQueues(final String previousSessionId, final String sessionId) {
        final Queue<UrlQueueImpl<Long>> urlQueueList = dataHelper.getUrlQueueList(sessionId);

     *
     * @param sessionId The session ID.
     */
    @Override
    public void delete(final String sessionId) {
        deleteBySessionId(sessionId);
    }

    /**
     * Offers multiple URL queue entries for the specified session.
     * Only URLs that don't already exist will be added.
     *
     * @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.
     */
    boolean visited(QUEUE urlQueue);

    /**
     * Generates URL queues.
     *
     * @param previousSessionId The previous session ID.
     * @param sessionId The session ID.

     *
     * @param sessionId the ID of the session for which the URLs should be excluded
     * @param urlList the list of URLs to be excluded
     */
    void addExcludeUrlFilter(String sessionId, List<String> urlList);

    /**
     * Deletes the URL filter associated with the specified session ID.
     *
     * @param sessionId the ID of the session whose URL filter is to be deleted
     */

     */
    @Override
    public void delete(final String sessionId) {
        deleteBySessionId(sessionId);
        includeFilterCache.invalidate(sessionId);
        excludeFilterCache.invalidate(sessionId);
    }

    /**
     * Gets the list of include URL patterns for the specified session.
     *
     * @param sessionId The session ID.
     * @return The list of compiled include patterns.

     *
     * @param sessionId The session ID.
     */
    @Override
    public void delete(final String sessionId) {
        deleteBySessionId(sessionId);
    }

    /**
     * Gets an access result by session ID and URL.
     *
     * @param sessionId The session ID.
     * @param url The URL.
     * @return The access result, or null if not found.
     */
    @Override

    }

    /**
     * Gets the session ID associated with this crawling session.
     *
     * @return the session ID, or null if not specified
     */
    public String getSessionId() {
        return sessionId;
    }

    /**
     * Sets the session ID associated with this crawling session.
     *
     * @param sessionId the session ID to set
     */