Create Multiple Angular Service Instances
An Angular service registered on the NgModule is globally visible on the entire application. Moreover it is a singleton instance, so every component that requires it via its constructor, will get the same instance. However this is not always the desired behavior.
Rather you may like to get a fresh instance of a given service every time a component requests it. This is especially powerful for caching scenarios for instance. In this lesson we will learn how to achieve such behavior with Angular’s hierarchical dependency injector.