/** How long after the last write an entry becomes a candidate for refresh. */
  final long refreshNanos;

  /** Entries waiting to be consumed by the removal listener. */
  // TODO(fry): define a new type which creates event objects and automates the clear logic
  final Queue<RemovalNotification<K, V>> removalNotificationQueue;

  /**

     * ClosingFuture)}.
     *
     * @param <V1> the type returned by the first future
     * @param <V2> the type returned by the second future
     * @param <V3> the type returned by the third future
     * @param <V4> the type returned by the fourth future
     * @param <V5> the type returned by the fifth future
     * @param <U> the type returned by the function
     */
    public interface ClosingFunction5<

  }

  /**
   * Creates an {@code EnumMap} instance.
   *
   * @param type the key type for this map
   * @return a new, empty {@code EnumMap}
   */
  public static <K extends Enum<K>, V extends @Nullable Object> EnumMap<K, V> newEnumMap(
      Class<K> type) {
    return new EnumMap<>(checkNotNull(type));
  }

  /**
   * Creates an {@code EnumMap} with the same mappings as the specified map.

  /** How long after the last write an entry becomes a candidate for refresh. */
  final long refreshNanos;

  /** Entries waiting to be consumed by the removal listener. */
  // TODO(fry): define a new type which creates event objects and automates the clear logic
  final Queue<RemovalNotification<K, V>> removalNotificationQueue;

  /**