/// tip | İpucu

`APIRouter` içinde `dependencies` kullanmak, örneğin bir grup *path operation* için kimlik doğrulamayı zorunlu kılmakta kullanılabilir. Dependency’leri tek tek her birine eklemeseniz bile.

///

/// check | Ek bilgi

`prefix`, `tags`, `responses` ve `dependencies` parametreleri (çoğu başka örnekte olduğu gibi) kod tekrarını önlemenize yardımcı olan, **FastAPI**’nin bir özelliğidir.

///

  transient @Nullable ImmutableSortedSet<E> descendingSet;

  /**
   * @since 12.0
   */
  @GwtIncompatible // NavigableSet
  @Override
  public ImmutableSortedSet<E> descendingSet() {
    // racy single-check idiom
    ImmutableSortedSet<E> result = descendingSet;
    if (result == null) {
      result = descendingSet = createDescendingSet();
      result.descendingSet = this;
    }
    return result;
  }

### Die Methode überschreiben { #override-the-method }

Jetzt können Sie die Methode `.openapi()` durch Ihre neue Funktion ersetzen.

{* ../../docs_src/extending_openapi/tutorial001_py310.py hl[29] *}

### Es testen { #check-it }

Sobald Sie auf [http://127.0.0.1:8000/redoc](http://127.0.0.1:8000/redoc) gehen, werden Sie sehen, dass Ihr benutzerdefiniertes Logo verwendet wird (in diesem Beispiel das Logo von **FastAPI**):

### Sobrescribir el método { #override-the-method }

Ahora puedes reemplazar el método `.openapi()` por tu nueva función.

{* ../../docs_src/extending_openapi/tutorial001_py310.py hl[29] *}

### Revisa { #check-it }

Una vez que vayas a [http://127.0.0.1:8000/redoc](http://127.0.0.1:8000/redoc) verás que estás usando tu logo personalizado (en este ejemplo, el logo de **FastAPI**):

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

In diesem Fall wird der Funktionsparameter `q` optional und standardmäßig `None` sein.

/// check | Testen

Beachten Sie auch, dass **FastAPI** intelligent genug ist, um zu erkennen, dass `item_id` ein Pfad-Parameter ist und `q` keiner, daher muss letzteres ein Query-Parameter sein.

///

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

В этом случае, параметр  `q` будет не обязательным и будет иметь значение `None` по умолчанию.

/// check | Важно

Также обратите внимание, что **FastAPI** достаточно умён чтобы заметить, что параметр `item_id` является path-параметром, а `q` нет, поэтому, это параметр запроса.

///

### 覆盖方法 { #override-the-method }

现在你可以用你的新函数替换 `.openapi()` 方法。

{* ../../docs_src/extending_openapi/tutorial001_py310.py hl[29] *}

### 验证 { #check-it }

当你访问 [http://127.0.0.1:8000/redoc](http://127.0.0.1:8000/redoc) 时，你会看到已使用你的自定义 Logo（本例中为 **FastAPI** 的 Logo）：

        // Default constructor
    }

    /**
     * Checks if RAG chat is available.
     *
     * @return true if RAG chat is available
     */
    public boolean isAvailable() {
        final boolean available = llmClientManager.available();
        if (logger.isTraceEnabled()) {
            logger.trace("[RAG] ChatClient availability check. available={}", available);
        }
        return available;
    }

     * be read without locking. Next fields of nodes are immutable (final). All list additions are
     * performed at the front of each bin. This makes it easy to check changes, and also fast to
     * traverse. When nodes would otherwise be changed, new nodes are created to replace them. This
     * works well for hash tables since the bin lists tend to be short. (The average length is less

    BlockingQueue<Future<T>> futureQueue = Queues.newLinkedBlockingQueue();
    long timeoutNanos = unit.toNanos(timeout);

    // For efficiency, especially in executors with limited
    // parallelism, check to see if previously submitted tasks are
    // done before submitting more of them. This interleaving
    // plus the exception mechanics account for messiness of main
    // loop.

    try {