How to differentiate usage and inheritance in a layered architecture?

Question

I'm trying to validate the following dependencies:

Source

In this picture, red relationships are forbidden, green relationships are allowed:

• no class in the adapter package can inherit from a class in the port package;
• any class in the adapter package can use (e.g. have a field) a class in the port package;
• no class in the service package can use (e.g. have a field) from a class in the port package;
• any class in the service package can inherit a class in the port package;

If possible I'd like to add these validations to Layered Architecture.

Thank you.

Answer 1

LayeredArchitecture considers all dependencies between layers. You cannot forbid inheritance, but allow access – nor vice versa. I recommend to define individual specific rules instead:

@ArchTest
ArchRule adapter_should_not_inherit_from_port = noClasses()
    .that().resideInAPackage("….adapter")
    .should().beAssignableTo(JavaClass.Predicates.resideInAPackage("….port"));

@ArchTest
ArchRule service_should_not_access_port = noClasses()
    .that().resideInAPackage("….service")
    .should().accessClassesThat().resideInAPackage("….port");