Dependencies

The Dependencies component in a SoapJS project plays a crucial role in managing dependencies and ensuring that components such as use cases, repositories, and controllers are correctly instantiated and available throughout your application. This component is automatically generated during the initial project setup when executing the soap new project command, but only if the user selects an option for inversion of control (IoC) like the Soap Singleton Container or Inversify.

Key Features of the Dependencies Component:

• Automatic Updates: Each time a new domain layer component (e.g., use case, repository, controller) that requires injection is added via the CLI, the configure method within the Dependencies component is updated to include this new component. This ensures that all necessary dependencies are correctly managed and injected where needed.

• IoC Framework Integration: Depending on the selected IoC option during project setup, the Dependencies component will be structured to align with that particular framework's requirements. For example, if Inversify is selected, the configuration will adhere to Inversify's binding and scope mechanisms.

• Centralized Dependency Management: By centralizing dependency configuration, the Dependencies component simplifies the management of application-wide services, repositories, and controllers, making the codebase more maintainable and scalable.

Example Configure Method in Dependencies Component:

TypeScript

export class Dependencies {
  public async configure(container: Container) {
    container
      .bind<ProcessOrderUseCase>(ProcessOrderUseCase.Token)
      .to(ProcessOrderUseCase);
    container
      .bind<CustomerController>(CustomerController.Token)
      .to(CustomerController);
    // Example of setting up dependencies for Inversify:    
    // Binding domain layer components:
    // This code is updated automatically as you add new components.
    const context = {
      collection: new CustomerMongoCollection(mongoClient),
      mapper: new CustomerMongoMapper(),
      queries: new QueryFactory()
    }
    const impl = new CustomerRepositoryImpl(context);
    container.bind<CustomerRepository>(CustomerRepository.Token).toConstantValue(impl);
    container.bind<CustomerController>(CustomerController.Token).to(CustomerController);
  }
}

In this example, the configure method sets up the bindings between interfaces (such as CustomerRepository) and their implementations (like CustomerRepositoryImpl). This approach decouples the creation and usage of objects, adhering to the principles of IoC and dependency inversion.

By leveraging the Dependencies component, SoapJS projects maintain a clean separation of concerns, promoting a more organized and testable codebase. This component ensures that all parts of the application can access the dependencies they require without directly managing their lifecycles, leading to more robust and modular software.