static final Object NULL = new Object();

  static final LazyLogger log = new LazyLogger(AbstractFuture.class);

  static final boolean GENERATE_CANCELLATION_CAUSES = false;

  private volatile @Nullable Object value;

  private volatile @Nullable Listener listeners;

        }

        private static class WindowBucket {
            private volatile long requestCount = 0;
            private volatile long failureCount = 0;
            private volatile long totalResponseTime = 0;
            private volatile long minResponseTime = Long.MAX_VALUE;
            private volatile long maxResponseTime = 0;
            private volatile long lastUpdateTime = System.currentTimeMillis();

      implements Supplier<T>, Serializable {
    private transient Object lock = new Object();

    final Supplier<T> delegate;
    transient volatile boolean initialized;
    // "value" does not need to be volatile; visibility piggy-backs
    // on volatile read of "initialized".
    transient @Nullable T value;

    MemoizingSupplier(Supplier<T> delegate) {
      this.delegate = checkNotNull(delegate);
    }

      implements Supplier<T>, Serializable {
    private transient Object lock = new Object();

    final Supplier<T> delegate;
    transient volatile boolean initialized;
    // "value" does not need to be volatile; visibility piggy-backs
    // on volatile read of "initialized".
    transient @Nullable T value;

    MemoizingSupplier(Supplier<T> delegate) {
      this.delegate = checkNotNull(delegate);
    }

    private volatile boolean includeStackTrace = false;
    private volatile Severity minLogLevel = Severity.INFO;

    // Performance optimization for sensitive data masking
    private volatile boolean enableHighPerformanceMode = false;
    private volatile boolean skipMaskingForDebugLevel = false;

    // Rate limiting
    private final Map<String, AtomicLong> rateLimitCounters = new ConcurrentHashMap<>();

   *
   * Note about volatile: volatile doesn't make it safe to read from a mutable graph in one thread
   * while writing to it in another. All it does is help with _reading_ from multiple threads
   * concurrently. For more information, see AbstractNetworkTest.concurrentIteration.
   */
  private transient volatile @Nullable Entry<K, V> cacheEntry;

  MapIteratorCache(Map<K, V> backingMap) {

    /** Register for IP address change notifications */
    public static final int WITNESS_REGISTER_IP_NOTIFICATION = 0x00000001;

    // Registration state
    private volatile WitnessRegistrationState state;
    private volatile long lastHeartbeat;
    private volatile int heartbeatFailures;
    private int flags;

    /**
     * Enumeration of possible witness registration states.
     */
    public enum WitnessRegistrationState {

    private final Smb2LeaseKey leaseKey;
    private final long createTime;
    private volatile long lastUpdateTime;
    private volatile long lastAccessTime;

    private final ConcurrentHashMap<String, FileInfo> children;
    private final ReadWriteLock lock;

    private volatile boolean isComplete;
    private volatile boolean hasChanges;
    private DirectoryCacheScope scope;
    private long maxAge;

        /** RDMA write operation */
        WRITE
    }

    private final long requestId;
    private final RequestType type;
    private final RdmaMemoryRegion memoryRegion;
    private volatile boolean completed;
    private volatile Exception error;

    /**
     * Create new RDMA work request
     *
     * @param requestId unique request identifier
     * @param type type of request

   *       argument.
   * </ul>
   */
  volatile @Nullable Object valueField;

  /** All listeners. */
  volatile @Nullable Listener listenersField;

  /** All waiting threads. */
  volatile @Nullable Waiter waitersField;

  /** Non-volatile write of the thread to the {@link Waiter#thread} field. */