}
	}

	for i, version := range x.versions {
		if version.header.VersionID != uv || version.header.Type != ObjectType {
			continue
		}
		// if uv has tiered content we add a
		// free-version to track it for asynchronous
		// deletion via scanner.
		ver, err := x.getIdx(i)
		if err != nil {
			return err
		}

		if freeVersion, toFree := ver.ObjectV2.InitFreeVersion(fi); toFree {
			return x.addVersion(freeVersion)

   * asynchronous only if {@link CacheLoader#reload} was overridden with an asynchronous
   * implementation.
   *
   * <p>Returns without doing anything if another thread is currently loading the value for {@code
   * key}. If the cache loader associated with this cache performs refresh asynchronously then this
   * method may return before refresh completes.
   *

- **Flexible Text Processing**: Configurable converters and normalizers for text transformation
- **OpenSearch Integration**: Seamless integration with OpenSearch/Elasticsearch clusters
- **Asynchronous Operations**: Non-blocking suggestion requests with callback support
- **Index Management**: Automatic index creation, switching, and maintenance

        // Shutdown scheduler
        scheduler.shutdown();

        // Close RPC client
        if (rpcClient != null) {
            rpcClient.close();
        }
    }

    /**
     * Starts asynchronous notification monitoring for a registration.
     *
     * @param registration the witness registration
     */
    private void startAsyncNotificationMonitoring(WitnessRegistration registration) {

要讓 `await` 運作，它必須位於支持非同步功能的函式內。為此，只需使用 `async def` 宣告函式：

```Python hl_lines="1"
async def get_burgers(number: int):
    # Do some asynchronous stuff to create the burgers
    return burgers
```

...而不是 `def`:

```Python hl_lines="2"
# This is not asynchronous
def get_sequential_burgers(number: int):
    # Do some sequential stuff to create the burgers
    return burgers
```

     *
     * @param config
     *            The configuration to use
     * @param mid
     *            The message ID of the request to cancel
     * @param asyncId
     *            The async ID for asynchronous operations (0 for synchronous)
     */
    public Smb2CancelRequest(final Configuration config, final long mid, final long asyncId) {
        super(config, SMB2_CANCEL);
        setMid(mid);
        setAsyncId(asyncId);

Here's a little bit of that history.

## Alternatives { #alternatives }

I have been creating APIs with complex requirements for several years (Machine Learning, distributed systems, asynchronous jobs, NoSQL databases, etc), leading several teams of developers.

As part of that, I needed to investigate, test and use many alternatives.

The history of **FastAPI** is in great part the history of its predecessors.

            this.roles = roles;
        }

        /**
         * Resets permissions to force recalculation on next getPermissions() call.
         * This is called after asynchronous parent group lookup completes.
         */
        public void resetPermissions() {
            this.permissions = null;
        }
    }

///

/// warning

如果你的應用仰賴 lifespan 事件，`AsyncClient` 不會觸發這些事件。若要確保它們被觸發，請使用 [florimondmanca/asgi-lifespan](https://github.com/florimondmanca/asgi-lifespan#usage) 的 `LifespanManager`。

///

## 其他非同步函式呼叫 { #other-asynchronous-function-calls }

由於測試函式現在是非同步的，你也可以在測試中呼叫（並 `await`）其他 `async` 函式，和在程式碼其他地方一樣。

/// tip

用户指南介绍了如何为应用添加[自定义中间件](../tutorial/middleware.md)。

以及如何[使用 `CORSMiddleware` 处理 CORS](../tutorial/cors.md)。

本章学习如何使用其它中间件。

## 添加 ASGI 中间件 { #adding-asgi-middlewares }

因为 **FastAPI** 基于 Starlette，且执行 <abbr title="Asynchronous Server Gateway Interface - 异步服务器网关接口">ASGI</abbr> 规范，所以可以使用任意 ASGI 中间件。

中间件不必是专为 FastAPI 或 Starlette 定制的，只要遵循 ASGI 规范即可。

总之，ASGI 中间件是类，并把 ASGI 应用作为第一个参数。

因此，有些第三方 ASGI 中间件的文档推荐以如下方式使用中间件：

```Python