// the behaviour of the non-GWT implementation of newConcurrentHashSet().
    // On the other hand HashSet might be better for code size if apps aren't
    // already using Collections.newSetFromMap and ConcurrentHashMap.
    return Collections.newSetFromMap(new ConcurrentHashMap<E, Boolean>());
  }

  static <E extends @Nullable Object> Set<E> newLinkedHashSetWithExpectedSize(int expectedSize) {

        return handle("", exception);
    }

    private ExceptionSummary handle(String message, Throwable exception) {
        String reference = getReference(Collections.newSetFromMap(new IdentityHashMap<>()), exception);

        List<ExceptionSummary> children = null;

        if (exception instanceof ProjectBuildingException projectBuildingException) {

  @Deprecated
  public static <E extends @Nullable Object> Set<E> newSetFromMap(
      Map<E, Boolean> map) {
    return Collections.newSetFromMap(map);
  }

  /**
   * An unmodifiable view of a set which may be backed by other sets; this view will change as the
   * backing sets do. Contains methods to copy the data into a new set which will then remain

    /**
     * Get active resource information
     *
     * @return set of active resource descriptions
     */
    public Set<String> getActiveResources() {
        Set<String> result = Collections.newSetFromMap(new ConcurrentHashMap<>());

        for (ResourceHolder holder : activeResources.values()) {
            if (!holder.closed && holder.isAlive()) {

       * UnsignedBytesBenchmark. TODO(cpovirk): benchmark this
       */
      /*
       * A CopyOnWriteArraySet<WeakReference> is faster than a newSetFromMap of a MapMaker map with
       * weakKeys() and concurrencyLevel(1), even up to at least 12 cached exception types.
       */
      private static final Set<WeakReference<Class<? extends Exception>>> validClasses =

       * UnsignedBytesBenchmark. TODO(cpovirk): benchmark this
       */
      /*
       * A CopyOnWriteArraySet<WeakReference> is faster than a newSetFromMap of a MapMaker map with
       * weakKeys() and concurrencyLevel(1), even up to at least 12 cached exception types.
       */
      private static final Set<WeakReference<Class<? extends Exception>>> validClasses =

  private val requestQueue = LinkedBlockingQueue<RecordedRequest>()
  private val openClientSockets =
    Collections.newSetFromMap(ConcurrentHashMap<Socket, Boolean>())
  private val openConnections =
    Collections.newSetFromMap(ConcurrentHashMap<Http2Connection, Boolean>())

  private val atomicRequestCount = AtomicInteger()

  private var serverSocketFactory_: ServerSocketFactory? = null