Execution Context(실행 컨텍스트)

<aside> 😋 풀어서 설명하면 스택의 경우 FILO (First In, Last Out) 의 구조이기에 순서를 보장, 콜스택 내부에 쌓인 실행 컨텍스트의 정보를 통해 환경을 보장할 수 있는 것

</aside>

Nest에서 제공하는 ExecutionContext

Nest provides several utility classes that help make it easy to write applications that function across multiple application contexts (e.g., Nest HTTP server-based, microservices and WebSockets application contexts). These utilities provide information about the current execution context which can be used to build generic guards, filters, and interceptors that can work across a broad set of controllers, methods, and execution contexts.

We cover two such classes in this chapter: ArgumentsHost and ExecutionContext.

<aside> 😋 즉, Context에 도움되는 여러가지 utility Class를 제공한다. 이것을 통해 Guard, Filter, interceptor, Decorater등에 사용할 수 있다.

</aside>

ExecutionContext의 구조

export interface ExecutionContext extends ArgumentsHost {
    /**
     * Returns the *type* of the controller class which the current handler belongs to.
     */
    getClass<T = any>(): Type<T>;
    /**
     * Returns a reference to the handler (method) that will be invoked next in the
     * request pipeline.
     */
    getHandler(): Function;
}

ArgumentsHost Class