Yet Another Architecture Clean Up

slices, clean architecture, runtime dependencies (inversion & || externalization) example

Slices first

Classified Ads is sample domain. First context is Realestate. So:

• com.example.classifieds.realestate.campaign
• com.example.classifieds.realestate.advertisement
• com.example.classifieds.realestate.exposure

Then layers

Domain:

• com.example.classifieds.realestate

Persistence:

• com.example.classifieds.realestate.repositories

Use Cases:

• com.example.classifieds.realestate.commands

Interactors:

• com.example.classifieds.realestate.handlers

Abstraction first

• Repositories in the domain are interfaces
• Handlers in use cases are interfaces

Then dependencies

• Persistence implements domain repositories
• Interactors are implementation of use cases' handlers; depend on domain but not on persistence

Experiment

• Each detail (implementation) can be considered as runtime dependency for higher level
• Infrastructure can be considered as orbit with satellites
• Layers are glued with help of satellites into application