) {
    withLock {
      allocationLimit = settings.getMaxConcurrentStreams()
    }
  }

  override fun handshake(): Handshake? = handshake

  /** Track a bad route in the route database. Other routes will be attempted first. */
  internal fun connectFailed(
    client: OkHttpClient,
    failedRoute: Route,
    failure: IOException,
  ) {

    //                                                                      ==============
    /**
     * Creates a new access context arranger for database operations.
     * This method provides a dummy implementation as Fess does not use DBFlute extensively.
     *
     * @return a new access context arranger
     */
    @Override

### Multiple Applications { #multiple-applications }

In the same server (or servers), there could be **multiple applications**, for example, other API programs or a database.

 *
 * <p>When {@code post} is called, all registered subscribers for an event are run in sequence, so
 * subscribers should be reasonably quick. If an event may trigger an extended process (such as a
 * database load), spawn a thread or queue it for later. (For a convenient way to do this, use an
 * {@link AsyncEventBus}.)
 *
 * <h2>Subscriber Methods</h2>
 *

* [`@contextlib.asynccontextmanager`](https://docs.python.org/3/library/contextlib.html#contextlib.asynccontextmanager)

都可以作為 **FastAPI** 的相依。

事實上，FastAPI 內部就是使用這兩個裝飾器。

///

## 使用 `yield` 的資料庫相依 { #a-database-dependency-with-yield }

例如，你可以用它建立一個資料庫 session，並在完成後關閉。

只有 `yield` 之前（含 `yield` 本身）的程式碼會在產生回應之前執行：

{* ../../docs_src/dependencies/tutorial007_py310.py hl[2:4] *}

	}
	return nil
}

func TestPropagateUnscoped(t *testing.T) {
	_DB, err := OpenTestConnection(&gorm.Config{
		PropagateUnscoped: true,
	})
	if err != nil {
		log.Printf("failed to connect database, got error %v", err)
		os.Exit(1)
	}

	_DB.Migrator().DropTable(&Product6{}, &ProductItem2{})
	_DB.AutoMigrate(&Product6{}, &ProductItem2{})

	p := Product6{
		Name: "unique_code",

                return null;
            }

            @Override
            public void store(CrawlingInfo entity) {
                throw new RuntimeException("Database error");
            }

            @Override
            public void storeInfo(List<CrawlingInfoParam> crawlingInfoParamList) {
                // Should not be called
            }

* [`@contextlib.asynccontextmanager`](https://docs.python.org/3/library/contextlib.html#contextlib.asynccontextmanager)

都可以作为 **FastAPI** 的依赖项。

实际上，FastAPI 在内部就是用的这两个装饰器。

///

## 使用 `yield` 的数据库依赖项 { #a-database-dependency-with-yield }

例如，你可以用这种方式创建一个数据库会话，并在完成后将其关闭。

在创建响应之前，只会执行 `yield` 语句及其之前的代码：

{* ../../docs_src/dependencies/tutorial007_py310.py hl[2:4] *}

`yield` 产生的值会注入到 *路径操作* 和其他依赖项中：

pkg database/sql, type NullFloat64 struct, Valid bool
pkg database/sql, type NullInt64 struct
pkg database/sql, type NullInt64 struct, Int64 int64
pkg database/sql, type NullInt64 struct, Valid bool
pkg database/sql, type NullString struct
pkg database/sql, type NullString struct, String string
pkg database/sql, type NullString struct, Valid bool
pkg database/sql, type RawBytes []uint8

는 **FastAPI**의 의존성으로 사용할 수 있습니다.

사실, FastAPI는 내부적으로 이 두 데코레이터를 사용합니다.

///

## `yield`를 사용하는 데이터베이스 의존성 { #a-database-dependency-with-yield }

예를 들어, 이 기능을 사용하면 데이터베이스 세션을 생성하고 작업이 끝난 후에 세션을 종료할 수 있습니다.

응답을 생성하기 전에는 `yield`문을 포함하여 그 이전의 코드만이 실행됩니다:

{* ../../docs_src/dependencies/tutorial007_py310.py hl[2:4] *}