Interfaces (Protocol/ABC)

If your code depends on abstractions (Protocols/ABCs), you must tell diwire what concrete class to build.

Two common ways:

1. concrete_class=...:

   container.register(Clock, concrete_class=SystemClock)
   

2. Decorator:

   @container.register(Clock, lifetime=Lifetime.SINGLETON)
   class SystemClock:
       ...
   

Example (runnable)

See the runnable script in Patterns (Interface registration section).