* @return the URL queue for the session
     */
    public synchronized Queue<UrlQueueImpl<Long>> getUrlQueueList(final String sessionId) {
        Queue<UrlQueueImpl<Long>> urlQueueList = urlQueueMap.get(sessionId);
        if (urlQueueList == null) {
            urlQueueList = new LinkedList<>();
            urlQueueMap.put(sessionId, urlQueueList);
        }
        return urlQueueList;
    }

    /**

        WitnessRegistration registration =
                client.registerForNotifications("\\\\server\\share", serverAddress, listener).get(5, TimeUnit.SECONDS);

        assertEquals(1, client.getActiveRegistrationCount());

        // Unregister
        client.unregister(registration).get(5, TimeUnit.SECONDS);

        assertEquals(0, client.getActiveRegistrationCount());

    assertEqualIgnoringOrder(values, multimap().get(key));

    if (!values.isEmpty()) {
      assertEqualIgnoringOrder(values, multimap().asMap().get(key));
      assertFalse(multimap().isEmpty());
    } else {
      assertNull(multimap().asMap().get(key));
    }

    assertEquals(values.size(), multimap().get(key).size());

    assertEquals(values.size() > 0, multimap().containsKey(key));

    /**
     * Returns the parent CrawlerClientFactory.
     * @return The parent CrawlerClientFactory.
     */
    public CrawlerClientFactory getParent() {
        return factory;
    }

    /**
     * Sets the initialization parameter map for this wrapper.
     * These parameters will be applied to the wrapped factory upon calling initParameterMap().
     * @param params The map of parameters.
     */
    @Override

     *
     * @return An <code>int</code> containing the flags in use for this
     * message.
     */
    public int getFlags() {
        return flags;
    }

    /**
     * Sets the flags for this message.
     *
     * @param flags The flags for this message.
     */
    public void setFlags(final int flags) {
        this.flags = flags;
    }

    /**

            if (settings.getAsList("synonyms", null) != null) {
                logger.warn("synonyms values are empty.");
            } else if (settings.get("synonyms_path") != null) {
                logger.warn("synonyms_path[{}] is empty.", settings.get("synonyms_path"));
            } else {
                logger.debug("No synonym data.");
            }
        }
    }

    @Override

        for (int i = 0; i < createdComponents.size(); i++) {
            for (int j = i + 1; j < createdComponents.size(); j++) {
                assertNotSame(createdComponents.get(i), createdComponents.get(j));
            }
        }
    }

    /**
     * Test concurrent destroy operations
     */
    public void test_concurrentDestroy() throws Exception {

    }

    @Override
    public boolean containsKey(@Nullable Object key) {
      return get(key) != null;
    }

    @Override
    public @Nullable V get(@Nullable Object key) {
      if (key instanceof Range) {
        Range<?> range = (Range<?>) key;
        RangeMapEntry<K, V> rangeMapEntry = entriesByLowerBound.get(range.lowerBound);
        if (rangeMapEntry != null && rangeMapEntry.getKey().equals(range)) {

            }
            return "Success";
        });

        final String result = fesenClient.get(c -> mockFuture);

        assertEquals("Success", result);
        assertEquals(6, attemptCount.get()); // Initial attempt + 5 retries
    }

    /**
     * Test: Retry logic fails after exceeding maxRetryCount

    if (entries.size() >= 1) {
      a = Multisets.immutableEntry(entries.get(0), sortedMultiset.count(entries.get(0)));
      if (entries.size() >= 3) {
        b = Multisets.immutableEntry(entries.get(1), sortedMultiset.count(entries.get(1)));
        c = Multisets.immutableEntry(entries.get(2), sortedMultiset.count(entries.get(2)));
      }
    }
  }