}

  /** Identifies all waitForXxx methods, which must be called while occupying the monitor. */
  private static boolean isWaitFor(Method method) {
    return method.getName().startsWith("waitFor");
  }

  /** Determines whether the given method takes a Guard as its first parameter. */
  private static boolean isGuarded(Method method) {
    Class<?>[] parameterTypes = method.getParameterTypes();

        private final int exitValue;

        public TestProcess(int exitValue) {
            this.exitValue = exitValue;
        }

        @Override
        public int waitFor() throws InterruptedException {
            return exitValue;
        }

        @Override
        public int exitValue() {
            return exitValue;
        }

        @Override

        private final int exitValue;

        public TestProcess(int exitValue) {
            this.exitValue = exitValue;
        }

        @Override
        public int waitFor() throws InterruptedException {
            return exitValue;
        }

        @Override
        public int exitValue() {
            return exitValue;
        }

        @Override

        private final int exitValue;

        public MockProcess(int exitValue) {
            this.exitValue = exitValue;
        }

        @Override
        public int waitFor() {
            return exitValue;
        }

        @Override
        public int exitValue() {
            return exitValue;
        }

        @Override
        public void destroy() {

            ProcessBuilder pb = new ProcessBuilder("docker", "--version");
            pb.redirectErrorStream(true);
            Process process = pb.start();
            int exitCode = process.waitFor();

            if (exitCode != 0) {
                return false;
            }

            // For CI environments, also check if Docker daemon is actually running
            if (isCI) {

  volatile @Nullable Waiter waitersField;

  /** Non-volatile write of the thread to the {@link Waiter#thread} field. */
  private static void putThread(Waiter waiter, Thread newValue) {
    ATOMIC_HELPER.putThread(waiter, newValue);
  }

  /** Non-volatile write of the waiter to the {@link Waiter#next} field. */
  private static void putNext(Waiter waiter, @Nullable Waiter newValue) {

  volatile @Nullable Waiter waitersField;

  /** Non-volatile write of the thread to the {@link Waiter#thread} field. */
  private static void putThread(Waiter waiter, Thread newValue) {
    ATOMIC_HELPER.putThread(waiter, newValue);
  }

  /** Non-volatile write of the waiter to the {@link Waiter#next} field. */
  private static void putNext(Waiter waiter, @Nullable Waiter newValue) {

                    } catch (InterruptedException e) {
                        // Ignore
                    }
                }
            });

            waiter.start();
            Thread.sleep(50); // Give waiter time to start

            response.received();

            assertTrue(latch.await(500, TimeUnit.MILLISECONDS));
            assertTrue(response.isReceived());
        }

    // Check that we wait long enough anyway (presumably as long as MAX_VALUE nanos):
    TimedWaiterThread waiter = new TimedWaiterThread(future, Long.MAX_VALUE, SECONDS);
    waiter.start();
    waiter.awaitWaiting();

    future.set(1);
    waiter.join();
  }

  @J2ktIncompatible // TODO(b/324550390): Enable
  public void testSetNull() throws Exception {
    future.set(null);

                return;
            }
            ThreadUtil.sleep(1000L);
        }
        fail("could not start job.");
    }

    protected static void waitJob(final String namePrefix) {
        Boolean isRunning = false;
        int count = 0;

        while (count < 300 && !isRunning) { // Wait until the crawler starts
            ThreadUtil.sleep(500);
            count++;