### Injeção de dependência

FastAPI inclui um sistema de <abbr title='também conhecido como "components", "resources", "services", "providers"'><strong>injeção de dependência</strong></abbr> extremamente fácil de usar, mas extremamente poderoso.

* Mesmo dependências podem ter dependências, criando uma hierarquia ou **"grafo" de dependências**.

```
/items/foo
```

/// info

Un "path" también es comúnmente llamado "endpoint" o "ruta".

///

Mientras construyes una API, el "path" es la forma principal de separar "concerns" y "resources".

#### Operación

"Operación" aquí se refiere a uno de los "métodos" HTTP.

Uno de:

* `POST`
* `GET`
* `PUT`
* `DELETE`

...y los más exóticos:

* `OPTIONS`

 * your HTTP calls. This is because each client holds its own connection pool and thread pools.
 * Reusing connections and threads reduces latency and saves memory. Conversely, creating a client
 * for each request wastes resources on idle pools.
 *
 * Use `new OkHttpClient()` to create a shared instance with the default settings:
 *
 * ```java
 * // The singleton HTTP client.
 * public final OkHttpClient client = new OkHttpClient();
 * ```

import org.codelibs.fess.crawler.helper.ContentLengthHelper;
import org.codelibs.fess.crawler.helper.MimeTypeHelper;

import jakarta.annotation.Resource;

/**
 * FtpClient is a crawler client implementation for accessing resources via the FTP protocol.
 * It extends {@link AbstractCrawlerClient} and provides methods to retrieve content and metadata
 * from FTP servers. The client supports various configurations, including authentication, timeouts,

     */
    String getProviderName();
    
    /**
     * Get maximum message size supported
     */
    int getMaxMessageSize();
    
    /**
     * Clean up provider resources
     */
    void shutdown();
}

public enum RdmaAccess {
    LOCAL_READ,
    LOCAL_WRITE,
    REMOTE_READ,
    REMOTE_WRITE,
    MEMORY_BIND
}
```

## 4. Data Structures

            assertDoesNotThrow(() -> {
                try (SmbResource r = resource) {
                    // Resource will be automatically closed
                }
            }, "Should work in try-with-resources");
        }

        @Test
        @DisplayName("multiple operations should work together")
        void testIntegratedOperations() throws CIFSException {
            // Given

所有的這些都是可重複使用的工具和套件，可以輕鬆與你的系統、資料儲存（Data Stores）、關聯式資料庫（RDBMS）以及非關聯式資料庫（NoSQL）等等整合。


### 依賴注入（Dependency Injection）

FastAPI 有一個使用簡單，但是非常強大的<abbr title='也叫做 "components", "resources", "services", "providers"'><strong>依賴注入</strong></abbr>系統。

* 依賴項甚至可以有自己的依賴，從而形成一個層級或**依賴圖**的結構。
* 所有**自動化處理**都由框架完成。
* 依賴項不僅能從請求中提取資料，還能**對 API 的路徑操作進行強化**，並自動生成文檔。
* 即使是依賴項中定義的*路徑操作參數*，也會**自動進行驗證**。

                    throw new ServletException(e);
                }
            }
        };
    }

    /**
     * Helper method to initialize NetworkExplorer with mocked resources
     */
    private void initializeNetworkExplorer(boolean enableBasic, String realm) throws ServletException {
        networkExplorer = createMockedNetworkExplorer(enableBasic, realm);

    public static final int ACB_DONT_REQUIRE_PREAUTH = 65536;

    /**
     * SAMR CloseHandle operation for closing an opened SAM handle.
     * This operation releases resources associated with the handle.
     */
    public static class SamrCloseHandle extends DcerpcMessage {

        @Override
        public int getOpnum() {
            return 0x01;
        }

    public static final int ACB_DONT_REQUIRE_PREAUTH = 65536;

    /**
     * SAMR CloseHandle operation for closing an opened SAM handle.
     * This operation releases resources associated with the handle.
     */
    public static class SamrCloseHandle extends DcerpcMessage {

        @Override
        public int getOpnum() {
            return 0x01;
        }