## Una *instance* "callable" { #a-callable-instance }

En Python hay una forma de hacer que una instance de una clase sea un "callable".

No la clase en sí (que ya es un callable), sino una instance de esa clase.

Para hacer eso, declaramos un método `__call__`:

{* ../../docs_src/dependencies/tutorial011_an_py310.py hl[12] *}

```

Assim, você escreve um código compartilhado apenas uma vez e o **FastAPI** se encarrega de chamá-lo em suas *operações de rota*.

/// check | Verifique

Perceba que você não precisa criar uma classe especial e enviar a dependência para algum outro lugar em que o **FastAPI** a "registre" ou realize qualquer operação similar.

Você apenas envia para `Depends` e o **FastAPI** sabe como fazer o resto.

///

        final TimeUnit timeUnit = TimeUnit.valueOf(getInitParameter(TIME_TO_LIVE_TIME_UNIT_PROPERTY, "MINUTES", String.class));
        final int maxTotal = getInitParameter(MAX_TOTAL_CONNECTION_PROPERTY, 200, Integer.class);
        final int defaultMaxPerRoute = getInitParameter(DEFAULT_MAX_CONNECTION_PER_ROUTE_PROPERTY, 20, Integer.class);

```

De cette façon vous écrivez le code partagé une seule fois et **FastAPI** se charge de l’appeler pour vos chemins d’accès.

/// check | Vérifications

Notez que vous n’avez pas à créer une classe spéciale et à la passer quelque part à **FastAPI** pour l’« enregistrer » ou quoi que ce soit de similaire.

Vous la passez simplement à `Depends` et **FastAPI** sait faire le reste.

///

 - [Slack](https://github.com/codelibs/fess-ds-slack)

## Thèmes

 - [Simple](https://github.com/codelibs/fess-theme-simple)
 - [Classique](https://github.com/codelibs/fess-theme-classic)

## Ingest

 - [Logger](https://github.com/codelibs/fess-ingest-logger)
 - [NDJSON](https://github.com/codelibs/fess-ingest-ndjson)

## Scripts

 - [Groovy](https://github.com/codelibs/fess-script-groovy)

 * witch is initialized using system properties.
 *
 */
public class Config {

    /**
     * Private constructor to prevent instantiation of this utility class.
     */
    private Config() {
        // Utility class - not instantiable
    }

    private static final Logger log = LoggerFactory.getLogger(Config.class);

    /**
     * This static method registers the SMB URL protocol handler which is

        final Class<?> rawType = toType.getRawType();
        if (XmlNode.class.isAssignableFrom(rawType)) {
            return XmlNodeBuilder.build(parser);
        }
        if (Xpp3Dom.class.isAssignableFrom(rawType)) {
            return new Xpp3Dom(XmlNodeBuilder.build(parser));
        }
        if (Properties.class.isAssignableFrom(rawType)) {

 *
 * <p>This is a classic &quot;bounded buffer&quot;, in which a fixed-sized array holds elements
 * inserted by producers and extracted by consumers. Once created, the capacity cannot be increased.
 * Attempts to {@code put} an element into a full queue will result in the operation blocking;
 * attempts to {@code take} an element from an empty queue will similarly block.
 *

// Set XLA's internal BuildXlaOpsPassFlags.tf_xla_enable_lazy_compilation to the
// value of 'enabled'. Also returns the original value of that flag.
//
// Use in tests to allow XLA to fallback to TF classic. This has global effect.
TF_CAPI_EXPORT unsigned char TF_SetXlaEnableLazyCompilation(
    unsigned char enable);
TF_CAPI_EXPORT unsigned char TF_SetTfXlaCpuGlobalJit(unsigned char enable);

## Varsayılan response class { #default-response-class }

Bir **FastAPI** class instance’ı veya bir `APIRouter` oluştururken, varsayılan olarak hangi response class’ının kullanılacağını belirtebilirsiniz.

Bunu tanımlayan parametre `default_response_class`’tır.