* that could call it, nor exposed this Future for users to call cancel() on).
     */
    requireNonNull(futures);

    // Corner case: List is empty.
    if (futures.isEmpty()) {
      handleAllCompleted();
      return;
    }

    // NOTE: If we ever want to use a custom executor here, have a look at CombinedFuture as we'll
    // need to handle RejectedExecutionException

   *     all other requests.
   */
  @Throws(IOException::class)
  fun takeHeaders(callerIsIdle: Boolean = false): Headers {
    withLock {
      while (headersQueue.isEmpty() && errorCode == null) {
        val doReadTimeout = callerIsIdle || doReadTimeout()
        if (doReadTimeout) {
          readTimeout.enter()
        }
        try {
          waitForIo()
        } finally {

    ImmutableList<String> result = builder.build();

    /*
     * Maybe it rejects all elements, or maybe it adds "a" before failing.
     * Either way is fine with us.
     */
    if (result.isEmpty()) {
      return;
    }
    assertTrue(ImmutableList.of("a").equals(result));
    assertEquals(1, result.size());
  }

  public void testBuilderAddCollectionHandlesNulls() {

  final Monitor monitor = new Monitor(true);
  private final Monitor.Guard notEmpty =
      new Monitor.Guard(monitor) {
        @Override
        public boolean isSatisfied() {
          return !q.isEmpty();
        }
      };

  /**
   * Creates a {@code MonitorBasedPriorityBlockingQueue} with the default initial capacity (11) that
   * orders its elements according to their {@linkplain Comparable natural ordering}.

        flushAttributes();
        return doAppendEscapeSequence(command, options);
    }

    private void flushAttributes() {
        if (attributeOptions.isEmpty()) {
            return;
        }
        if (attributeOptions.size() == 1 && attributeOptions.get(0) == 0) {
            builder.append(FIRST_ESC_CHAR);
            builder.append(SECOND_ESC_CHAR);

      }
    } else {
      keys[dstIndex] = null;
      values[dstIndex] = null;
      entries[dstIndex] = 0;
    }
  }

  int firstEntryIndex() {
    return isEmpty() ? -1 : 0;
  }

  int getSuccessor(int entryIndex) {
    return (entryIndex + 1 < size) ? entryIndex + 1 : -1;
  }

  /**

						}
						hostIPCache[host] = hostIPSet
					}
				}
				if IPSet, ok := pathIPMap[endpoint.Path]; ok {
					if !IPSet.Intersection(hostIPSet).IsEmpty() {
						return nil, setupType,
							config.ErrInvalidErasureEndpoints(nil).Msg(fmt.Sprintf("same path '%s' can not be served by different port on same address", endpoint.Path))
					}

      synchronized (this) {
        return ImmutableList.copyOf(stateHistory);
      }
    }

    @Override
    public synchronized void starting() {
      assertTrue(stateHistory.isEmpty());
      assertThat(service.state()).isNotEqualTo(State.NEW);
      stateHistory.add(State.STARTING);
    }

    @Override
    public synchronized void running() {

    ImmutableSet<Entry<E>> es = entrySet;
    return (es == null) ? (entrySet = createEntrySet()) : es;
  }

  private ImmutableSet<Entry<E>> createEntrySet() {
    return isEmpty() ? ImmutableSet.of() : new EntrySet();
  }

  abstract Entry<E> getEntry(int index);

  @WeakOuter
  private final class EntrySet extends IndexedImmutableSet<Entry<E>> {
    @Override

      synchronized (this) {
        return ImmutableList.copyOf(stateHistory);
      }
    }

    @Override
    public synchronized void starting() {
      assertTrue(stateHistory.isEmpty());
      assertThat(service.state()).isNotEqualTo(State.NEW);
      stateHistory.add(State.STARTING);
    }

    @Override
    public synchronized void running() {