}

  public void testAddAllPrimitiveIntStream() {
    StatsAccumulator accumulator = new StatsAccumulator();
    accumulator.addAll(megaPrimitiveDoubleStreamPart1().mapToInt(x -> (int) x));
    accumulator.addAll(megaPrimitiveDoubleStreamPart2().mapToInt(x -> (int) x));
    assertThat(accumulator.count()).isEqualTo(MEGA_STREAM_COUNT);
    assertThat(accumulator.mean()).isWithin(ALLOWED_ERROR * MEGA_STREAM_COUNT).of(MEGA_STREAM_MEAN);

                    }
                } catch (IOException e) {
                    throw new UncheckedIOException(e);
                }
                _defaultParallel = socketToCore.values().stream().mapToInt(i -> i).sum();
            } else if (OS.current() == OS.MAC) {
                // Ask macOS to count physical CPUs for us
                ByteArrayOutputStream stdout = new ByteArrayOutputStream();

  }

  public void testAddAllPrimitiveIntStream() {
    StatsAccumulator accumulator = new StatsAccumulator();
    accumulator.addAll(megaPrimitiveDoubleStreamPart1().mapToInt(x -> (int) x));
    accumulator.addAll(megaPrimitiveDoubleStreamPart2().mapToInt(x -> (int) x));
    assertThat(accumulator.count()).isEqualTo(MEGA_STREAM_COUNT);
    assertThat(accumulator.mean()).isWithin(ALLOWED_ERROR * MEGA_STREAM_COUNT).of(MEGA_STREAM_MEAN);

    assertThat(stats.min()).isEqualTo(MEGA_STREAM_MIN);
    assertThat(stats.max()).isEqualTo(MEGA_STREAM_MAX);
  }

  public void testOfPrimitiveIntStream() {
    Stats stats = Stats.of(megaPrimitiveDoubleStream().mapToInt(x -> (int) x));
    assertThat(stats.count()).isEqualTo(MEGA_STREAM_COUNT);
    assertThat(stats.mean()).isWithin(ALLOWED_ERROR * MEGA_STREAM_COUNT).of(MEGA_STREAM_MEAN);
    assertThat(stats.populationVariance())

     *
     * @return channel statistics
     */
    public ChannelStatistics getStatistics() {
        return new ChannelStatistics(sessionChannels.size(),
                sessionChannels.values().stream().mapToInt(ChannelGroup::getChannelCount).sum(), totalRequests.get(),
                totalChannelsCreated.get());
    }

    /**
     * Channel statistics.
     */
    public static class ChannelStatistics {

            .orElseThrow();
    }
    
    private ChannelInfo selectWeightedRandom(Collection<ChannelInfo> channels) {
        // Calculate total weight
        int totalWeight = channels.stream()
            .mapToInt(ChannelInfo::getScore)
            .sum();
        
        if (totalWeight == 0) {
            // All channels have zero score, pick randomly
            List<ChannelInfo> list = new ArrayList<>(channels);

 *   <li>Can be queried without allocating garbage.
 *   <li>Access to {@code IntStream} features (like {@link IntStream#sum}) using {@code stream()}
 *       instead of the awkward {@code stream().mapToInt(v -> v)}.
 * </ul>
 *
 * <p>Disadvantages compared to {@code ImmutableList<Integer>}:
 *
 * <ul>
 *   <li>Can't be passed directly to methods that expect {@code Iterable}, {@code Collection}, or