Exploring the Factory Design Pattern Together with Dependency Injection in Angular

I'm currently implementing the factory design pattern in Angular, but I feel like I might be missing something or perhaps there's a more efficient approach. My current setup involves a factory that returns a specific car class based on user input (e.g., selecting "Mazda" will return an instance of the Mazda class, while choosing "Ford" will return an instance of the Ford class). Each car class relies on multiple services.

  constructor(
    private userService: UserService,
    private logService: LogService
  ) {}

  create(
    info
  ):
    | Mazda
    | Tesla
    | Ford
    switch (info.type) {
      case 'mazda':
        return new Mazda(info, this.userService, this.logService);
      case 'tesla':
        return new Tesla(info, this.userService, this.logService);
      case 'ford':
        return new Ford(info, this.userService, this.logService);
    }
  }
}

The issue arises when setting up the factory within a component, as it requires injecting the dependencies.

this.carFactory = new CarFactory(this.userService, this.logService);

It feels odd that my component needs to be aware of the dependencies required by the factory. Is there a way to establish a factory in Angular without having to pass the dependencies during instantiation? Perhaps something like

this.carFactory = new CarFactory();

Answer №1

To tackle this issue, follow these steps:

  1. Designate the above class as a provider (such as Mazda, Tesla, Ford).

  2. Within the factory class, inject a single dependency called "Injector".

  3. In the create function, ensure to return the following:

return this.injector.get(Tesla)

This approach allows for dynamic resolution of dependencies.

Answer №2

If you want to utilize the CarFactory as a dependency, you can define it like this:

@Injectable(providedIn: 'root') // or provided wherever you need it
export class CarFactory {...}

Afterwards, you can simply inject it into the desired location in your code:

constructor(private carFactory: CarFactory) {
  const car = carFactory.create({type: 'tesla'});
}

Being part of the dependency injection hierarchy, the CarFactory has access to whatever is provided within this section of the Angular application.

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