### Dependency Injection

FastAPI bao gồm một hệ thống <abbr title='cũng biết đến như là "components", "resources", "services", "providers"'><strong>Dependency Injection</strong></abbr> vô cùng dễ sử dụng nhưng vô cùng mạnh mẽ.

      // Int
      if (const int i_size = default_value.list().i_size()) {
        absl::InlinedVector<int64_t, 4> i_vector;
        i_vector.reserve(i_size);
        for (int i = 0; i < i_size; ++i) {
          i_vector.push_back(default_value.list().i(i));
        }
        TFE_OpSetAttrIntList(op, attr_name, i_vector.data(), i_size);
      }
      // Float
      if (const int f_size = default_value.list().f_size()) {

        }

        return className.toString();
    }

    private void updateFileIfChanged() throws IOException {
        String path = "META-INF/maven/org.apache.maven.api.di.Inject";
        Set<String> existingClasses = new TreeSet<>(); // Using TreeSet for natural ordering
        String existingContent = "";

        // Try to read existing content
        try {

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.model.validation;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import java.io.File;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Deque;
import java.util.HashMap;

    return {"fresh_value": fresh_value}
```

////

## Recapitulando

Com exceção de todas as palavras complicadas usadas aqui, o sistema de **Injeção de Dependência** é bastante simples.

Consiste apenas de funções que parecem idênticas a *funções de operação de rota*.

* Wie man **Validierungseinschränkungen** wie `maximum_length` oder `regex` setzt.
* Ein sehr leistungsfähiges und einfach zu bedienendes System für **<abbr title="Dependency Injection – Einbringen von Abhängigkeiten: Auch bekannt als Komponenten, Ressourcen, Provider, Services, Injectables">Dependency Injection</abbr>**.
* Sicherheit und Authentifizierung, einschließlich Unterstützung für **OAuth2** mit **JWT-Tokens** und **HTTP-Basic**-Authentifizierung.

	diskMinInodes = 1000

	// tlsClientSessionCacheSize is the cache size for client sessions.
	tlsClientSessionCacheSize = 100
)

func init() {
	// Injected to prevent circular dependency.
	pubsub.GetByteBuffer = grid.GetByteBuffer
}

type poolDisksLayout struct {
	cmdline string
	layout  [][]string
}

type disksLayout struct {
	legacy bool

		log.Errorf("failed to update POD inpod: %s/%s %v", pod.Namespace, pod.Name, err)
		return err
	}

	// For *any* failures after calling `CreateInpodRules`, we must return PartialAdd error.
	// The pod was injected with iptables rules, so it must be annotated as "inpod" - even if
	// the following fails.
	// This is so that if it is removed from the mesh, the inpod rules will unconditionally
	// be removed.

# Klassen als Abhängigkeiten

Bevor wir tiefer in das **Dependency Injection** System eintauchen, lassen Sie uns das vorherige Beispiel verbessern.

## Ein `dict` aus dem vorherigen Beispiel

Im vorherigen Beispiel haben wir ein `dict` von unserer Abhängigkeit („Dependable“) zurückgegeben:

//// tab | Python 3.10+

```Python hl_lines="9"
{!> ../../docs_src/dependencies/tutorial001_an_py310.py!}
```

////

//// tab | Python 3.9+

 * Don't need to worry about intermediate responses like redirects and retries.
 * Are always invoked once, even if the HTTP response is served from the cache.
 * Observe the application's original intent. Unconcerned with OkHttp-injected headers like `If-None-Match`.
 * Permitted to short-circuit and not call `Chain.proceed()`.
 * Permitted to retry and make multiple calls to `Chain.proceed()`.