Provider

Class Overview

Provides instances of T. Typically implemented by an injector. For any type T that can be injected, you can also inject Provider<T>. Compared to injecting T directly, injecting Provider<T> enables:

• retrieving multiple instances.
• lazy or optional retrieval of an instance.
• breaking circular dependencies.
• abstracting scope so you can look up an instance in a smaller scope from an instance in a containing scope.

For example:

   class Car {
     @Inject Car(Provider<Seat> seatProvider) {
       Seat driver = seatProvider.get();
       Seat passenger = seatProvider.get();
       ...
     }
   }

Summary