Nest framework dependency injection with Factory pattern. An example showcasing dynamically loading various data sources based on query parameters.
$ yarn install# dev + watch mode
$ npm run start:dev| Endpoint | Details |
|---|---|
| http://localhost:3000/api/data?source=source01 | Should return data from source 1 |
| http://localhost:3000/api/data?source=source02 | Should return data from source 2 |
| http://localhost:3000/api/data?source=source03 | Should return data from source 3 |
/src/dynds/
Contains the sample module DynDS which consists of 3 different services (data sources) located under sub folder services. These services can be present and loaded from any other module (they are kept here to be showcased as an example).
/src/api/
Contains the module which utilizes DynDS and loads the data dynamically from the services.
| ℹ️ Note |
|---|
As the service classes used within DynDSModule follow Dependency Injection, it does introduces overhead for the application, as all the services will still be initialized even if they are not used, if this is a major concern for your application then consider implementing lazy initialization |