`It was much pleasanter at home,' thought poor Alice, `when one
wasn't always growing larger and smaller, and being ordered about
by mice and rabbits.  I almost wish I hadn't gone down that
rabbit-hole--and yet--and yet--it's rather curious, you know,
this sort of life!  I do wonder what CAN have happened to me!
When I used to read fairy-tales, I fancied that kind of thing
never happened, and now here I am in the middle of one!  There

  `It was much pleasanter at home,' thought poor Alice, `when one
wasn't always growing larger and smaller, and being ordered about
by mice and rabbits.  I almost wish I hadn't gone down that
rabbit-hole--and yet--and yet--it's rather curious, you know,
this sort of life!  I do wonder what CAN have happened to me!
When I used to read fairy-tales, I fancied that kind of thing
never happened, and now here I am in the middle of one!  There

     * consist strictly of loading values, though during refresh a value may be both active and
     * loading.
     */
    boolean isActive();
  }

  /** Placeholder. Indicates that the value hasn't been set yet. */
  static final ValueReference<Object, Object> UNSET =
      new ValueReference<Object, Object>() {
        @CheckForNull
        @Override
        public Object get() {
          return null;
        }

    bulkFuture.addListener(
        new Runnable() {
          @Override
          public void run() {
            /*
             * firstFuture just completed, but AggregateFuture hasn't yet had time to record the
             * exception in seenExceptions. When we complete secondFuture with the same exception,
             * we want for AggregateFuture to still detect that it's been previously seen.
             */

    bulkFuture.addListener(
        new Runnable() {
          @Override
          public void run() {
            /*
             * firstFuture just completed, but AggregateFuture hasn't yet had time to record the
             * exception in seenExceptions. When we complete secondFuture with the same exception,
             * we want for AggregateFuture to still detect that it's been previously seen.
             */

     * consist strictly of loading values, though during refresh a value may be both active and
     * loading.
     */
    boolean isActive();
  }

  /** Placeholder. Indicates that the value hasn't been set yet. */
  static final ValueReference<Object, Object> UNSET =
      new ValueReference<Object, Object>() {
        @CheckForNull
        @Override
        public Object get() {
          return null;
        }

     * into any other.
     */
    SUBSUMED,

    /**
     * Some {@link ListenableFuture} has a callback attached that will close the {@link
     * CloseableList}, but it has not yet run. The {@link CloseableList} may not be subsumed.
     */
    WILL_CLOSE,

    /**
     * The callback that closes the {@link CloseableList} is running, but it has not completed. The