state = State.CANCELLED;
    notifyAndClearListeners();

    if (delegate != null) {
      // TODO(lukes): consider adding the StackOverflowError protection from the server version
      delegate.cancel(mayInterruptIfRunning);
    }

    return true;
  }

  protected void interruptTask() {}

  @Override
  public boolean isCancelled() {

   * 4380</a>.
   *
   * @since 5.0
   */
  public static final class TeredoInfo {
    private final Inet4Address server;
    private final Inet4Address client;
    private final int port;
    private final int flags;

    /**
     * Constructs a TeredoInfo instance.
     *
     * <p>Both server and client can be {@code null}, in which case the value {@code "0.0.0.0"} will
     * be assumed.
     *

   * acquire(3) arrives. We serve this request out of storedPermits, and reduce that to 7.0 (how
   * this is translated to throttling time is discussed later). Immediately after, assume that an
   * acquire(10) request arriving. We serve the request partly from storedPermits, using all the
   * remaining 7.0 permits, and the remaining 3.0, we serve them by fresh permits produced by the
   * rate limiter.
   *

   * as when it was first created.
   *
   * <p>The returned {@code RateLimiter} is intended for cases where the resource that actually
   * fulfills the requests (e.g., a remote server) needs "warmup" time, rather than being
   * immediately accessed at the stable (maximum) rate.
   *
   * <p>The returned {@code RateLimiter} starts in a "cold" state (i.e. the warmup period will

    assertTrue(InetAddresses.isTeredoAddress((Inet6Address) ip));
    InetAddresses.TeredoInfo teredo = InetAddresses.getTeredoInfo((Inet6Address) ip);

    InetAddress server = InetAddresses.forString(serverStr);
    assertEquals(server, teredo.getServer());

    InetAddress client = InetAddresses.forString(clientStr);
    assertEquals(client, teredo.getClient());

    assertEquals(port, teredo.getPort());

    assertTrue(InetAddresses.isTeredoAddress((Inet6Address) ip));
    InetAddresses.TeredoInfo teredo = InetAddresses.getTeredoInfo((Inet6Address) ip);

    InetAddress server = InetAddresses.forString(serverStr);
    assertEquals(server, teredo.getServer());

    InetAddress client = InetAddresses.forString(clientStr);
    assertEquals(client, teredo.getClient());

    assertEquals(port, teredo.getPort());

       * fastest (more than twice as fast as the Java implementation, vs ~1.5x with non-final static
       * fields, on x86_32) under the Hotspot server compiler. The reason is obviously that the
       * non-final fields need to be reloaded inside the loop.
       *
       * And, no, defining (final or not) local variables out of the loop still isn't as good

 * when appropriate and {@link #awaitHealthy} will still work as expected.
 *
 * <p>Here is a simple example of how to use a {@code ServiceManager} to start a server.
 *
 * <pre>{@code
 * class Server {
 *   public static void main(String[] args) {
 *     Set<Service> services = ...;
 *     ServiceManager manager = new ServiceManager(services);
 *     manager.addListener(new Listener() {

   *       {@code consistentHash} will handle it. If, however, you are dividing traffic among
   *       servers {@code alpha}, {@code bravo}, and {@code charlie} and you occasionally need to
   *       take each of the servers offline, {@code consistentHash} will be a poor fit: It provides
   *       no way for you to specify which of the three buckets is disappearing. Thus, if your

          "www",
          "abc.a23",
          "biz.com.ua",
          "x",
          "fOo",
          "f--o",
          "f_a",
          "foo.net.us\uFF61ocm",
          "woo.com.",
          "8server.shop",
          "123.cn",
          "a" + DELTA + "b.com",
          ALMOST_TOO_MANY_LEVELS,
          ALMOST_TOO_LONG);

  private static final ImmutableSet<String> INVALID_NAME =
      ImmutableSet.of(