}
        }
      } finally {
        monitor.leave();
      }
      Collections.sort(
          loadTimes,
          Ordering.natural()
              .onResultOf(
                  new Function<Entry<Service, Long>, Long>() {
                    @Override
                    public Long apply(Entry<Service, Long> input) {

          }
        }
      } finally {
        monitor.leave();
      }
      Collections.sort(
          loadTimes,
          Ordering.natural()
              .onResultOf(
                  new Function<Entry<Service, Long>, Long>() {
                    @Override
                    public Long apply(Entry<Service, Long> input) {

   * corresponding LockGraphNode, with the {@code allowedPriorLocks} and {@code
   * disallowedPriorLocks} prepopulated with nodes according to the natural ordering of the
   * associated Enum values.
   */
  @VisibleForTesting
  static <E extends Enum<E>> Map<E, LockGraphNode> createNodes(Class<E> clazz) {
    EnumMap<E, LockGraphNode> map = Maps.newEnumMap(clazz);

 * thus paying for the cost of the expensive task.
 *
 * @author Dimitris Andreou
 * @since 13.0
 */
// TODO(user): switch to nano precision. A natural unit of cost is "bytes", and a micro precision
// would mean a maximum rate of "1MB/s", which might be small in some cases.
@Beta
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault

itself, `Oh dear!  Oh dear!  I shall be late!'  (when she thought
it over afterwards, it occurred to her that she ought to have
wondered at this, but at the time it all seemed quite natural);
but when the Rabbit actually TOOK A WATCH OUT OF ITS WAISTCOAT-
POCKET, and looked at it, and then hurried on, Alice started to
her feet, for it flashed across her mind that she had never

        checkArgument(
            graphMap.containsKey(node) || graphMap.containsValue(node),
            "Node %s is not an element of this graph",
            node);
        return Ordering.natural().immutableSortedCopy(graphMap.get(node));
      }
    };
  }

  private static ImmutableGraph<Character> createSingleRootGraph() {
    MutableGraph<Character> graph = GraphBuilder.directed().build();

        checkArgument(
            graphMap.containsKey(node) || graphMap.containsValue(node),
            "Node %s is not an element of this graph",
            node);
        return Ordering.natural().immutableSortedCopy(graphMap.get(node));
      }
    };
  }

  private static ImmutableGraph<Character> createSingleRootGraph() {
    MutableGraph<Character> graph = GraphBuilder.directed().build();

        return of(elements[0]);
      default:
        return construct(elements.clone());
    }
  }

  /**
   * Returns an immutable list containing the given elements, sorted according to their natural
   * order. The sorting algorithm used is stable, so elements that compare as equal will stay in the
   * order in which they appear in the input.
   *

## Um aplicativo com callbacks

Vamos ver tudo isso com um exemplo.

Imagine que você tem um aplicativo que permite criar faturas.

Essas faturas terão um `id`, `title` (opcional), `customer` e `total`.

O usuário da sua API (um desenvolvedor externo) criará uma fatura em sua API com uma solicitação POST.

Então sua API irá (vamos imaginar):

* Enviar uma solicitação de pagamento para o desenvolvedor externo.

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