import java.io.Writer;
import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;

import org.apache.maven.api.di.Named;

/**
 * Annotation processor that generates an index file for classes annotated with {@link Named}.
 * This processor scans for classes with the {@code @Named} annotation and creates a file
 * at {@code META-INF/maven/org.apache.maven.api.di.Inject} containing the fully qualified
 * names of these classes.

/**
 * Utilities for collecting and validating tester requirements from annotations.
 *
 * @author George van den Driessche
 */
@GwtIncompatible
public final class FeatureUtil {
  /** A cache of annotated objects (typically a Class or Method) to its set of annotations. */
  private static final Map<AnnotatedElement, List<Annotation>> annotationCache = new HashMap<>();

```Python hl_lines="1  5-7" title="app/dependencies.py"
{!> ../../docs_src/bigger_applications/app_an/dependencies.py!}
```

////

//// tab | Python 3.8+ non-Annotated

/// tip | Подсказка

Мы рекомендуем использовать версию `Annotated`, когда это возможно.

///

```Python hl_lines="1  4-6" title="app/dependencies.py"
{!> ../../docs_src/bigger_applications/app/dependencies.py!}
```

////

    /**
     * Default constructor for RelatedContentHelper.
     * The constructor does not perform any initialization logic as the actual
     * initialization is handled by the {@link #init()} method annotated with
     * {@code @PostConstruct}.
     */
    public RelatedContentHelper() {
        super();
    }

    private static final Logger logger = LogManager.getLogger(RelatedContentHelper.class);

    /**

/**
 * Utilities for collecting and validating tester requirements from annotations.
 *
 * @author George van den Driessche
 */
@GwtIncompatible
public final class FeatureUtil {
  /** A cache of annotated objects (typically a Class or Method) to its set of annotations. */
  private static final Map<AnnotatedElement, List<Annotation>> annotationCache = new HashMap<>();

   * the bridge method in addition to the original method, which causes both the original and bridge
   * methods to be subscribed (since both are annotated @Subscribe) without specifically checking
   * for bridge methods.
   */
  // We use an anonymous class to be sure that we generate two methods (bridge and original).
  @SuppressWarnings("AnonymousToLambda")

   * {@code C}
   *
   * <ul>
   *   <li>All visible static methods are checked such that passing null for any parameter that's
   *       not annotated nullable (according to the rules of {@link NullPointerTester}) should throw
   *       {@link NullPointerException}.
   *   <li>If there is any visible constructor or visible static factory method declared by the

        assertEquals(3, roles.length);
        assertEquals("ROLE_USER", roles[0]);
        assertEquals("ROLE_ADMIN", roles[1]);
        assertEquals("ROLE_GUEST", roles[2]);
    }

    // Test non-annotated method
    public void test_methodWithoutAnnotation() throws NoSuchMethodException {
        Method method = MethodAnnotatedClass.class.getMethod("nonAnnotatedMethod");

Vamos criar uma **dependência** do FastAPI com `yield` que fornecerá uma nova `Session` para cada requisição. Isso é o que garante que usamos uma única sessão por requisição. 🤓

Então, criamos uma dependência `Annotated` chamada `SessionDep` para simplificar o restante do código que usará essa dependência.

{* ../../docs_src/sql_databases/tutorial001_an_py310.py ln[25:30] hl[25:27,30] *}

### Criar Tabelas de Banco de Dados na Inicialização

```

...the bigger the codebase, the more noticeable it is.

Now you can create an annotated dependency once, like this:

```Python
CurrentUser = Annotated[User, Depends(get_current_user)]
```

And then you can reuse this `Annotated` dependency:

```Python
CurrentUser = Annotated[User, Depends(get_current_user)]


@app.get("/items/")
def read_items(user: CurrentUser):