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Technical Architecture

The technical architecture of each microservice can be individually designed. Frameworks or programming languages do not have to be uniform for all microservices. Therefore, each microservice may well use different platforms. However, certain technical infrastructures fit microservices better than others.

Process Engines

Process engines, which typically serve to orchestrate services in an SOA (section 6.1), can be used within a microservice to model a business process. The important point is that one microservice should implement only one domain—that is, one Bounded Context. A microservice should not end working purely to integrate or orchestrate other microservices without its own logic. When this happens, changes will affect not just the responsible microservice but also the microservice responsible for integration/ orchestration. However, it is a central objective of microservice-based architectures that changes should be limited to one microservice whenever possible. If multiple business processes have to be implemented, different microservices should be used for these. Each of these microservices should implement one business process together with the dependent services. Of course, it will not always be possible to avoid other microservices having to be integrated to implement a business process. However, a microservice that just represents an integration is not sensible.

 
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