* changing any bin. The operations must not take any action that could even momentarily
     * cause a concurrent read operation to see inconsistent data. This is made easier by the
     * nature of the read operations in Map. For example, no operation can reveal that the table
     * has grown but the threshold has not yet been updated, so there are no atomicity requirements
     * for this with respect to reads.

  private final FluentFuture<V> future;

  private ClosingFuture(ListenableFuture<V> future) {
    this(future, new CloseableList());
  }

  private ClosingFuture(ListenableFuture<V> future, CloseableList closeables) {
    this.future = FluentFuture.from(future);
    this.closeables = closeables;
  }

  /**

   */
  private static final Comparator<?> NATURAL_ORDER = Ordering.natural();

  private static final ImmutableSortedMap<Comparable<?>, Object> NATURAL_EMPTY_MAP =
      new ImmutableSortedMap<>(ImmutableSortedSet.emptySet(Ordering.natural()), ImmutableList.of());

  static <K, V> ImmutableSortedMap<K, V> emptyMap(Comparator<? super K> comparator) {
    if (Ordering.natural().equals(comparator)) {
      return of();
    } else {

   * description of the returned view's behavior.
   *
   * <p><b>Warning:</b> {@code Range}s always represent a range of values using the values' natural
   * ordering. {@code NavigableSet} on the other hand can specify a custom ordering via a {@link
   * Comparator}, which can violate the natural ordering. Using this method (or in general using
   * {@code Range}) with unnaturally-ordered sets can lead to unexpected and undefined behavior.
   *

 * AsyncCacheLoader.asyncLoad}</a> must return a {@code CompletableFuture}. Users of Guava's {@link
 * com.google.common.util.concurrent.ListenableFuture} can adapt between the two {@code Future}
 * types by using <a href="https://github.com/lukas-krecan/future-converter#java8-guava">{@code
 * net.javacrumbs.futureconverter.java8guava.FutureConverter}</a>.
 *
 * <h2>More on {@code CacheBuilder}</h2>
 *

   * completes. Cancelling the supplied future will also cancel the returned future, but cancelling
   * the returned future will have no effect on the supplied future.
   *
   * @since 15.0
   */
  public static <V extends @Nullable Object> ListenableFuture<V> nonCancellationPropagating(
      ListenableFuture<V> future) {
    if (future.isDone()) {
      return future;
    }

    assertAssignable(
        TypeToken.of(new TypeCapture<L>() {}.capture()),
        TypeToken.of(new TypeCapture<L>() {}.capture()));
    assertNotAssignable(
        TypeToken.of(new TypeCapture<R>() {}.capture()),
        TypeToken.of(new TypeCapture<L>() {}.capture()));
    assertAssignable(TypeToken.of(new TypeCapture<L>() {}.capture()), new TypeToken<List<R>>() {});
  }

  public void testisSupertypeOf_resolved() {

 * AsyncCacheLoader.asyncLoad}</a> must return a {@code CompletableFuture}. Users of Guava's {@link
 * com.google.common.util.concurrent.ListenableFuture} can adapt between the two {@code Future}
 * types by using <a href="https://github.com/lukas-krecan/future-converter#java8-guava">{@code
 * net.javacrumbs.futureconverter.java8guava.FutureConverter}</a>.
 *
 * <h2>More on {@code CacheBuilder}</h2>
 *

    to do domain fronting.
 *  New: charset support for `Credentials.basic()`.


## Version 3.5.0

_2016-11-30_

 *  **Web Sockets are now a stable feature of OkHttp.** Since being introduced as a beta feature in
    OkHttp 2.3 our web socket client has matured. Connect to a server's web socket with
    `OkHttpClient.newWebSocket()`, send messages with `send()`, and receive messages with the
    `WebSocketListener`.

    // Legacy configuration keys for backward compatibility (Azure AD)
    /** Legacy configuration key for Azure AD state time-to-live. */
    protected static final String AAD_STATE_TTL = "aad.state.ttl";

    /** Legacy configuration key for Azure AD authority URL. */
    protected static final String AAD_AUTHORITY = "aad.authority";

    /** Legacy configuration key for Azure AD tenant ID. */