Concrete Components

The concrete component contains a single dependency, so it violates the DIP. This is typical. DIP violations cannot be entirely removed, but they can be gathered into a small number of concrete components and kept separate from the rest of the system.

Most systems will contain at least one such concrete component, often called main because it contains the main function. In the case illustrated, the main function would instantiate the ServiceFactoryImpl and place that instance in a global variable of type ServiceFactory. The Application would then access the factory through that global variable.