long nanos = expirationNanos;
      long now = System.nanoTime();
      if (nanos == 0 || now - nanos >= 0) {
        synchronized (this) {
          if (nanos == expirationNanos) { // recheck for lost race
            T t = delegate.get();
            value = t;
            nanos = now + durationNanos;
            // In the very unlikely event that nanos is 0, set it to 1;

      long nanos = expirationNanos;
      long now = System.nanoTime();
      if (nanos == 0 || now - nanos >= 0) {
        synchronized (this) {
          if (nanos == expirationNanos) { // recheck for lost race
            T t = delegate.get();
            value = t;
            nanos = now + durationNanos;
            // In the very unlikely event that nanos is 0, set it to 1;

    ExecutorService service = mock(ExecutorService.class);
    when(service.awaitTermination(HALF_SECOND_NANOS, NANOSECONDS)).thenReturn(true);
    when(service.isTerminated()).thenReturn(true);
    assertTrue(shutdownAndAwaitTermination(service, 1L, SECONDS));
    verify(service).shutdown();
    verify(service).awaitTermination(HALF_SECOND_NANOS, NANOSECONDS);
  }

    private static final int TIME_1970_SEC_32LE = 2;
    private static final int TIME_1904_SEC_32BE = 3;
    private static final int TIME_1904_SEC_32LE = 4;
    private static final int TIME_1601_NANOS_64LE = 5;
    private static final int TIME_1601_NANOS_64BE = 6;
    private static final int TIME_1970_MILLIS_64BE = 7;
    private static final int TIME_1970_MILLIS_64LE = 8;


    /**
     * 
     */
    private Encdec () {}

    ExecutorService service = mock(ExecutorService.class);
    when(service.awaitTermination(HALF_SECOND_NANOS, NANOSECONDS)).thenReturn(true);
    when(service.isTerminated()).thenReturn(true);
    assertTrue(shutdownAndAwaitTermination(service, 1L, SECONDS));
    verify(service).shutdown();
    verify(service).awaitTermination(HALF_SECOND_NANOS, NANOSECONDS);
  }

    public static final int TIME_1970_SEC_32LE = 2;
    public static final int TIME_1904_SEC_32BE = 3;
    public static final int TIME_1904_SEC_32LE = 4;
    public static final int TIME_1601_NANOS_64LE = 5;
    public static final int TIME_1601_NANOS_64BE = 6;
    public static final int TIME_1970_MILLIS_64BE = 7;
    public static final int TIME_1970_MILLIS_64LE = 8;

    /* Encode integers
     */

      long nanos = unit.toNanos(timeout);
      synchronized (lock) {
        while (true) {
          if (shutdown && runningTasks == 0) {
            return true;
          } else if (nanos <= 0) {
            return false;
          } else {
            long now = System.nanoTime();
            TimeUnit.NANOSECONDS.timedWait(lock, nanos);

  @SuppressWarnings("GoodTime") // should be a java.time.Duration
  private static final int DEFAULT_EXPIRATION_NANOS = 0;

  @SuppressWarnings("GoodTime") // should be a java.time.Duration
  private static final int DEFAULT_REFRESH_NANOS = 0;

  static final Supplier<? extends StatsCounter> NULL_STATS_COUNTER =
      Suppliers.ofInstance(
          new StatsCounter() {

  /** Caller should check before calling that guard is not satisfied. */
  @GuardedBy("lock")
  private boolean awaitNanos(Guard guard, long nanos, boolean signalBeforeWaiting)
      throws InterruptedException {
    boolean firstTime = true;
    try {
      do {
        if (nanos <= 0L) {
          return false;
        }
        if (firstTime) {
          if (signalBeforeWaiting) {

       * if the timer expires, otherwise behaves like {@link #get()}.
       */
      V get(long nanos)
          throws TimeoutException, CancellationException, ExecutionException, InterruptedException {

        // Attempt to acquire the shared lock with a timeout.
        if (!tryAcquireSharedNanos(-1, nanos)) {
          throw new TimeoutException("Timeout waiting for task.");
        }

        return getValue();