когда использовать beforeApplicationShutdown против onApplicationShutdown?

Question

каковы практические варианты использования beforeApplicationShutdown и onApplicationShutdown

@Injectable()
class UsersService implements beforeApplicationShutdown {
  beforeApplicationShutdown(signal: string) {
    console.log(signal); // e.g. "SIGINT"
  }
}

@Injectable()
class UsersService implements OnApplicationShutdown {
  onApplicationShutdown(signal: string) {
    console.log(signal); // e.g. "SIGINT"
  }
}