Summary

In this first chapter on DDD, we looked at the four fundamental layers and the core building blocks in these layers. The ABP startup template is more complex than that four-layered structure. You learned how the startup template has evolved by one change at a time, and you understood the reasons behind these changes.

Regarding DDD, you learned that the business logic is separated into two layers: the application layer and the domain layer. We discussed how to deal with multiple applications that share the same domain logic by referencing the EventHub example solution.

We then understood how an HTTP request is executed and passed through the layers in a typical DDD-based software. Finally, we discussed isolating your application and domain layers from the infrastructure details, especially the database providers and UI frameworks.

This chapter aimed to show the big picture and the fundamental concepts of DDD. The next chapter will focus on implementing domain layer...