return 6;
          }
        };
    Future<Integer> future =
        TestingExecutors.sameThreadScheduledExecutor().schedule(task, 10000, MILLISECONDS);
    assertTrue("Should run callable immediately", taskDone);
    assertEquals(6, (int) future.get());
  }

  public void testSameThreadScheduledExecutorWithException() throws InterruptedException {
    Runnable runnable =
        new Runnable() {

        assertFalse(auth.isExpired());

        // Set short TTL
        auth.setAuthenticationTTL(100); // 100 milliseconds
        assertEquals(100, auth.getAuthenticationTTL());

        // Still not expired immediately
        assertFalse(auth.isExpired());

        // Wait for expiration
        Thread.sleep(150);

        // Should be expired now
        assertTrue(auth.isExpired());

        // Reset timestamp

   * specified array and the size of the specified collection.
   *
   * <p>If the collection fits in the specified array with room to spare (i.e., the array has more
   * elements than the collection), the element in the array immediately following the end of the
   * collection is set to {@code null}. This is useful in determining the length of the collection
   * <i>only</i> if the caller knows that the collection does not contain any null elements.
   *

Esto incluye, por ejemplo:

* Notificaciones por email enviadas después de realizar una acción:
  * Como conectarse a un servidor de email y enviar un email tiende a ser "lento" (varios segundos), puedes devolver el response de inmediato y enviar la notificación por email en segundo plano.
* Procesamiento de datos:

  private val random: Random,
  private val pingIntervalMillis: Long,
  /**
   * For clients this is initially null, and will be assigned to the agreed-upon extensions. For
   * servers, it should be the agreed-upon extensions immediately.
   */
  private var extensions: WebSocketExtensions?,
  /** If compression is negotiated, outbound messages of this size and larger will be compressed. */
  private var minimumDeflateSize: Long,

        assertTrue(errorHandler.shouldFallbackToTcp(hardwareError), "Hardware errors should suggest TCP fallback");
        assertFalse(errorHandler.shouldFallbackToTcp(timeoutError), "Timeout errors should not immediately suggest TCP fallback");

        // Test error classification using public API
        assertNotNull(errorHandler, "Error handler should handle network errors");

        // Test fallback logic which is public

   *
   * <p>The returned executor is backed by the executor returned by {@link
   * MoreExecutors#newDirectExecutorService} and subject to the same constraints.
   *
   * <p>Although all tasks are immediately executed in the thread that submitted the task, this
   * {@code ExecutorService} imposes a small locking overhead on each task submission in order to
   * implement shutdown and termination behavior.
   *

   *
   * <p>The returned executor is backed by the executor returned by {@link
   * MoreExecutors#newDirectExecutorService} and subject to the same constraints.
   *
   * <p>Although all tasks are immediately executed in the thread that submitted the task, this
   * {@code ExecutorService} imposes a small locking overhead on each task submission in order to
   * implement shutdown and termination behavior.
   *

        return headersQueue.removeFirst()
      }
      throw errorException ?: StreamResetException(errorCode!!)
    }
  }

  /**
   * Returns the trailers if they're immediately available.
   */
  @Throws(IOException::class)
  fun peekTrailers(): Headers? {
    withLock {
      if (source.finished && source.receiveBuffer.exhausted() && source.readBuffer.exhausted()) {

      // and when it is done will run the listeners.
      if (hasListeners.compareAndSet(false, true)) {
        if (delegate.isDone()) {
          // If the delegate is already done, run the execution list immediately on the current
          // thread.
          executionList.execute();
          return;
        }

        // TODO(lukes): handle RejectedExecutionException
        adapterExecutor.execute(