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Cohesion

The domain architecture of the overall system influences the domain architecture of the individual microservices. As presented in section 7.1, microservices should be loosely coupled to each other and have high cohesion internally. This means that a microservice should have only one responsibility with regard to the domain. If microservices are not highly cohesive, then most likely the microservice has more than one responsibility. If the cohesion within the microservice is not high enough, the microservice can be split into several microservices. The split ensures that the microservices remain small and thus are easier to understand, maintain, and replace.

Encapsulation

Encapsulation means that part of the architecture hides internal information from the outside—particularly internal data structures. Access should instead occur only through an interface. This makes sure that the software remains easy to modify, because internal structures can be changed without influencing other parts of the system. For this reason, microservices should never allow other microservices access to their internal data structures. If they do, then these data structures can no longer be modified. In order to use another microservice, only the interface for that microservice needs to be understood. This improves the structure and intelligibility of the system.

 
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