* eagerly fetches data for each source when iterated (rather than producing sources that only
   * load data through their streams). Prefer using the {@link #concat(Iterable)} overload if
   * possible.
   *
   * @param sources the sources to concatenate
   * @return a {@code CharSource} containing the concatenated data
   * @throws NullPointerException if any of {@code sources} is {@code null}

   * eagerly fetches data for each source when iterated (rather than producing sources that only
   * load data through their streams). Prefer using the {@link #concat(Iterable)} overload if
   * possible.
   *
   * @param sources the sources to concatenate
   * @return a {@code CharSource} containing the concatenated data
   * @throws NullPointerException if any of {@code sources} is {@code null}

    // TODO: b/381289911 - Evaluate the performance impact of doing so.
    return join(parts.iterator());
  }

  /*
   * TODO: b/381289911 - Make the Iterator overload use StringJoiner (including Android or not)—or
   * some other optimization, given that StringJoiner can over-allocate:
   * https://bugs.openjdk.org/browse/JDK-8305774
   */

   *
   * <p><b>{@code Stream} equivalent:</b> {@link java.util.stream.Stream#of(Object[])
   * Stream.of(T...)}.
   *
   * @since 20.0 (since 18.0 as an overload of {@code of})
   */
  public static <E extends @Nullable Object> FluentIterable<E> from(E[] elements) {
    return from(Arrays.asList(elements));
  }

  /**

   *
   * <p><b>{@code Stream} equivalent:</b> {@link java.util.stream.Stream#of(Object[])
   * Stream.of(T...)}.
   *
   * @since 20.0 (since 18.0 as an overload of {@code of})
   */
  public static <E extends @Nullable Object> FluentIterable<E> from(E[] elements) {
    return from(Arrays.asList(elements));
  }

  /**

   * eagerly fetches data for each source when iterated (rather than producing sources that only
   * load data through their streams). Prefer using the {@link #concat(Iterable)} overload if
   * possible.
   *
   * @param sources the sources to concatenate
   * @return a {@code ByteSource} containing the concatenated data
   * @throws NullPointerException if any of {@code sources} is {@code null}

     *     `sslSocketFactory(SSLSocketFactory, X509TrustManager)`, which avoids such reflection.
     */
    @Deprecated(
      message = "Use the sslSocketFactory overload that accepts a X509TrustManager.",
      level = DeprecationLevel.ERROR,
    )
    fun sslSocketFactory(sslSocketFactory: SSLSocketFactory) =
      apply {
        if (sslSocketFactory != this.sslSocketFactoryOrNull) {

   * usually be handled more naturally using {@code tryFind(iterator, predicate).or(defaultValue)}.
   *
   * @since 7.0
   */
  // For discussion of this signature, see the corresponding overload of *Iterables*.find.
  public static <T extends @Nullable Object> @Nullable T find(
      Iterator<? extends T> iterator, Predicate<? super T> predicate, @Nullable T defaultValue) {
    checkNotNull(iterator);

        byte[] viaHash = NtlmUtil.nTOWFv2(domain, user, NtlmUtil.getNTHash(password));
        byte[] viaPassword = NtlmUtil.nTOWFv2(domain, user, password);

        // Assert: overloads consistent
        assertArrayEquals(viaHash, viaPassword, "Both overloads must compute same NTLMv2 key");

        // Changing domain should change the key (domain is part of MAC input)
        byte[] differentDomain = NtlmUtil.nTOWFv2("DOMAIN", user, password);

Blocking APIs may be inefficient because you hold a thread idle while waiting on the network. Threads are expensive because they have both a memory overhead and a context-switching overhead.

#### Framed protocols