return channels.get(index);

            case LEAST_CONNECTIONS:
                return channels.stream()
                        .min((c1, c2) -> Integer.compare(c1.getActiveConnections(), c2.getActiveConnections()))
                        .orElse(channels.get(0));

            case RANDOM:
                return channels.get((int) (Math.random() * channels.size()));

                        }
                    }
                } else {
                    log(logHelper, LogType.NO_URL_IN_QUEUE, crawlerContext, urlQueue, Integer.valueOf(threadCheckCount));

                    if (crawlerContext.intervalController != null) {
                        crawlerContext.intervalController.delay(IntervalController.NO_URL_IN_QUEUE);
                    }

    void testConcurrentNonceGeneration() throws InterruptedException {
        // Given
        int threadCount = 10;
        int noncesPerThread = 1000;
        ConcurrentHashMap<String, Integer> nonceMap = new ConcurrentHashMap<>();
        AtomicInteger collisions = new AtomicInteger(0);
        CountDownLatch latch = new CountDownLatch(threadCount);

     * @param form the search form
     * @return HTML response for the list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            labelTypePager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            labelTypePager.setCurrentPageNumber(0);

//	sparse files      |     no |       yes |       yes
//
// The table's upper portion shows the [Header] fields, where each format reports
// the maximum number of bytes allowed for each string field and
// the integer type used to store each numeric field
// (where timestamps are stored as the number of seconds since the Unix epoch).
//
// The table's lower portion shows specialized features of each format,

            }

            @Override
            public String getMailReturnPath() {
                return "******@****.***";
            }

            @Override
            public Integer getCrawlerSystemMonitorIntervalAsInteger() {
                return 60000;
            }
        };
        ComponentUtil.register(fessConfig, "fessConfig");

      } finally {
        monitor.leave();
      }
    } else {
      return null;
    }
  }

  // this doc comment is overridden to remove the reference to collections
  // greater in size than Integer.MAX_VALUE
  /**
   * Returns the number of elements in this queue.
   *
   * @return the number of elements in this queue
   */
  @CanIgnoreReturnValue
  @Override
  public int size() {

// https://github.com/klauspost/compress/tree/master/s2#s2-compression
// This ensures integrity and reduces the size typically by at least 50%.
//
// All stream elements are msgpack encoded.
//
// 1 Integer, metacacheStreamVersion of the writer.
// This can be used for managing breaking changes.
//
// For each element:
// 1. Bool. If false at end of stream.
// 2. String. Name of object. Directories contains a trailing slash.

        for (final String line : values) {
            final Matcher matcher = pattern.matcher(line);
            if (matcher.matches()) {
                if (lineNum == 0) {
                    lineNum = Integer.parseInt(matcher.group(1));
                    list.clear();
                }
                list.add(matcher.group(2));
            } else {
                list.add(line);
            }
        }

     * @param form the search form containing filter criteria
     * @return HTML response with the user list
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            userPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            userPager.setCurrentPageNumber(0);