dispatcher: Dispatcher,
  ) {
  }

  /**
   * Invoked when [call] will be executed immediately.
   *
   * This method is invoked after [dispatcherQueueStart].
   */
  open fun dispatcherQueueEnd(
    call: Call,
    dispatcher: Dispatcher,
  ) {
  }

  /**
   * Invoked prior to a proxy selection.
   *
   * This will be invoked for route selection regardless of whether the client

        Thread.sleep(100); // Wait a bit to ensure error callback isn't called
        assertEquals("Then callback should be invoked", 1, thenCount.get());
        assertEquals("Error callback should not be invoked", 0, errorCount.get());
    }

    @Test
    public void test_mixedCallbacks_onlyErrorInvokedOnReject() throws Exception {

   *
   * <p>Cancellation does not propagate from the output future to a callable that has begun to
   * execute, but if the output future is cancelled before {@link Callable#call()} is invoked,
   * {@link Callable#call()} will not be invoked.
   */
  public <T extends @Nullable Object> ListenableFuture<T> submit(
      Callable<T> callable, Executor executor) {
    checkNotNull(callable);
    checkNotNull(executor);

  /**
   * The maximum number of requests to execute concurrently. Above this requests queue in memory,
   * waiting for the running calls to complete.
   *
   * If more than [maxRequests] requests are in flight when this is invoked, those requests will
   * remain in flight.
   */
  @get:Synchronized
  var maxRequests = 64
    set(maxRequests) {
      require(maxRequests >= 1) { "max < 1: $maxRequests" }
      synchronized(this) {

   * Future} fails with the given {@code exceptionType}, from the result provided by the {@code
   * fallback}. {@link Function#apply} is not invoked until the primary input has failed, so if the
   * primary input succeeds, it is never invoked. If, during the invocation of {@code fallback}, an
   * exception is thrown, this exception is used as the result of the output {@code Future}.
   *
   * <p>Usage example:

   * <p>This method should return promptly; prefer to do work on a different thread where it is
   * convenient. It is invoked exactly once on service shutdown, even when {@link #stopAsync} is
   * called multiple times.
   *
   * <p>If {@link #stopAsync} is called on a {@link State#STARTING} service, this method is not
   * invoked immediately. Instead, it will be deferred until after the service is {@link

    service.startAsync().awaitRunning();
    assertTrue(service.startUpCalled);
    assertEquals(Service.State.RUNNING, service.state());

    enterRun.await(); // to avoid stopping the service until run() is invoked

    service.stopAsync().awaitTerminated();
    assertTrue(service.shutDownCalled);
    assertEquals(Service.State.TERMINATED, service.state());
    executionThread.join();
  }

   * connected - this does nothing and returns false. Otherwise, this returns true and the caller
   * should immediately invoke this method again until it returns false.
   *
   * This method may only be invoked by the writer thread. There may be only thread invoking this
   * method at a time.
   */
  @Throws(IOException::class)
  internal fun writeOneFrame(): Boolean {

        public String toString() {
          throw new AssertionFailedError();
        }
      };

  private static class Message {
    boolean invoked;

    @Override
    public String toString() {
      assertFalse(invoked);
      invoked = true;
      return "A message";
    }
  }

  private static final String FORMAT = "I ate %s pies.";

        public String toString() {
          throw new AssertionFailedError();
        }
      };

  private static class Message {
    boolean invoked;

    @Override
    public String toString() {
      assertFalse(invoked);
      invoked = true;
      return "A message";
    }
  }

  private static final String FORMAT = "I ate %s pies.";