> For the complete documentation index, see [llms.txt](https://jakekwak.gitbook.io/nestjs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jakekwak.gitbook.io/nestjs/fundamentals/asynchronous-providers.md).

# Asynchronous providers

## Asynchronous providers

일부 **비동기 작업**이 완료 될 때까지 (예: 데이터베이스와의 연결이 설정 될 때까지) 응용 프로그램 시작을 지연해야하는 경우 비동기 공급자 사용을 고려해야 합니다. `비동기` 공급자를 만들기 위해 `useFactory`를 사용합니다. 팩토리는 `Promise`를 반환해야 합니다 (따라서 `async` 기능도 적합합니다).

```typescript
{
  provide: 'ASYNC_CONNECTION',
  useFactory: async () => {
    const connection = await createConnection(options);
    return connection;
  },
}
```

> info **힌트** 사용자 정의 제공자 구문에 대해 자세히 알아보십시오 [여기](https://app.gitbook.com/fundamentals/custom-providers).

## Injection

비동기 프로바이더는 토큰 (위의 경우 `ASYNC_CONNECTION`토큰)에 의해 다른 컴포넌트에 간단히 주입될 수 있습니다. 비동기 공급자가 **이미 해결**되면 비동기 공급자에 종속된 각 클래스가 인스턴스화됩니다.

위의 예는 데모용입니다. 더 자세한 정보를 원한다면 [여기 참조](https://app.gitbook.com/recipes/sql-typeorm).


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