}
  }

  /**
   * Verify thread safety by using a collection whose size() may be inconsistent with the actual
   * number of elements and whose elements may change over time.
   *
   * <p>This test might fail in GWT because the GWT emulations might count on the input collection
   * not to change during the copy. It is safe to do so in GWT because javascript is
   * single-threaded.
   */

    private final AtomicInteger registrationCounter = new AtomicInteger(0);
    private final ConcurrentHashMap<String, MockRegistration> registrations = new ConcurrentHashMap<>();
    private Thread serverThread;

    /**
     * Mock registration data
     */
    private static class MockRegistration {
        final String registrationId;
        final String shareName;
        final String serverAddress;

    // (Still done).
    assertThat(secondResponseCode.get()).isEqualTo(200)
  }

  private fun buildRequestThread(
    path: String,
    responseCode: AtomicInteger,
  ): Thread =
    Thread {
      val url = mockWebServer.url(path).toUrl()
      val conn: HttpURLConnection
      try {
        conn = url.openConnection() as HttpURLConnection

    } catch (ExecutionException e) {
      throw new AssertionError(e);
    }
  }

  static void verifyThreadWasNotInterrupted() {
    assertFalse(Thread.currentThread().isInterrupted());
  }

  static void clearInterrupt() {
    Thread.interrupted();
  }

  /**
   * Retrieves the result of a {@code Future} known to be done but uses the {@code get(long,
   * TimeUnit)} overload in order to test that method.

                            // Transform operation
                            ResponseData responseData = new ResponseData();
                            responseData.setUrl("http://thread" + threadId + ".com/page" + j);
                            ResultData resultData = transformer.transform(responseData);

    // Enqueueing the red task starts a thread because the head of the queue changed.
    redQueue.execute("red task") {
      log += "red:starting@${taskFaker.nanoTime}"
      taskFaker.sleep(100.µs)
      log += "red:finishing@${taskFaker.nanoTime}"
    }
    assertThat(taskFaker.executeCallCount).isEqualTo(1)

    // Enqueueing the blue task doesn't start a thread because the red one is still starting.

 * <pre>
 * {@code
 * String escapedXml = XmlUtil.escapeXml("<tag>value</tag>");
 * Map<String, Object> dataMap = XmlUtil.getDataMap(accessResultData);
 * }
 * </pre>
 *
 * <h2>Thread Safety:</h2>
 * <p>
 * This class is thread-safe as it does not maintain any state.
 * </p>
 *
 * <h2>Dependencies:</h2>
 * <ul>
 *   <li>org.apache.logging.log4j.Logger</li>
 *   <li>org.apache.logging.log4j.LogManager</li>

        HcHttpClient client = new HcHttpClient() {
            @Override
            protected ResponseData processHttpMethod(final String url, final HttpUriRequest httpRequest) {
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    throw new CrawlingAccessException(e);
                }
                return null;
            }
        };

            while (crawler.crawlerContext.getStatus() != CrawlerStatus.RUNNING && System.currentTimeMillis() - startTime < 5000) {
                try {
                    Thread.sleep(50);
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                    break;
                }
            }
            assertEquals(CrawlerStatus.RUNNING, crawler.crawlerContext.getStatus());

    CRAWLING_EXCEPTION,
    /** Indicates no URL is available in the queue. */
    NO_URL_IN_QUEUE,
    /** Indicates the start of a crawler thread. */
    START_THREAD,
    /** Indicates the finish of a crawler thread. */
    FINISHED_THREAD,
    /** Indicates no response processor is available. */
    NO_RESPONSE_PROCESSOR,
    /** Indicates no rule is available for processing. */
    NO_RULE,