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CHAPTER 6 | Tackle Business Complexity in a Microservice with DDD and CQRS Patterns
Figure 7-1. External microservice architecture versus internal architecture patterns for each microservice
However, most of the techniques for data driven microservices, such as how to implement an ASP.NET
Core Web API service or how to expose Swagger metadata with Swashbuckle or NSwag, are also
applicable to the more advanced microservices implemented internally with DDD patterns. This
section is an extension of the previous sections, because most of the practices explained earlier also
apply here or for any kind of microservice.
This section first provides details on the simplified CQRS patterns used in the eShopOnContainers
reference application. Later, you will get an overview of the DDD techniques that enable you to find
common patterns that you can reuse in your applications.
DDD is a large topic with a rich set of resources for learning. You can start with books like
Domain-
Driven Design
by Eric Evans and additional materials from Vaughn Vernon, Jimmy Nilsson, Greg
Young, Udi Dahan, Jimmy Bogard, and many other DDD/CQRS experts. But most of all you need to try
to learn how to apply DDD techniques from the conversations, whiteboarding, and domain modeling
sessions with the experts in your concrete business domain.
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