boolean visited(QUEUE urlQueue);

    /**
     * Generates URL queues.
     *
     * @param previousSessionId The previous session ID.
     * @param sessionId The session ID.
     */
    void generateUrlQueues(String previousSessionId, String sessionId);

            }

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

            @Override
            public void generateUrlQueues(String previousSessionId, String sessionId) {
            }
        };

        CrawlingParameterUtil.setUrlQueueService(service);

        // Verify it can be retrieved

     * 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);

        when(dataHelper.getUrlQueueList(sessionId)).thenReturn(newQueue);
        when(dataHelper.getAccessResultMap(previousSessionId)).thenReturn(accessResultMap);

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

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

        // Verify the generated queues have correct properties

     *
     * @param previousSessionId The previous session ID.
     * @param sessionId The new session ID.
     */
    @Override
    public void generateUrlQueues(final String previousSessionId, final String sessionId) {
        dataService.iterate(previousSessionId, accessResult -> {
            final OpenSearchUrlQueue urlQueue = new OpenSearchUrlQueue();