How does a microservices design complicate business logic?API Gateway Interview Questions for Experienced/API Gateway Interview Questions and Answers for Freshers & Experienced

How does a microservices design complicate business logic?

In the case of Microservices the business logic of an application is spread over multiple microservices.

In the case of a simple request, the request may be addressed via a single microservices. However, in the case of complex requests, the request will need to be handled by multiple services with one service calling another. Cross-services communications need to be carefully handled and addressed.

Lots of aspects need to be considered while developing complex business logic especially in the case of microservice architecture. In the case of complex requests, where multiple services are called, a saga pattern is required to ensure data consistency across multiple services. The business logic will need to generate events when the data changes. There is a clear need to structure the business logic depending on whether the scenario is simple or complex.

For simple scenarios, it is better to choose the transaction script pattern itself instead of using an object-oriented approach.

In the case of a transaction script pattern, a method called ‘transaction script’ is written to handle each request from the presentation layer. The classes implementing behavior will need to be separate from that the classes which store the state.

In the case of complex business logic, Domain-driven design (DDD) is preferred. DDD is useful to decompose an application into multiple services. In the case of DDD, each service has its domain model instead of a single application-wide domain model. Subdomains and Bounded context are two of the strategic Domain-driven design patterns.

While decomposing an application into services, one common pitfall to avoid is to not group related activities into one service. Grouping should be done based on domain and not based on entity.

Posted Date:- 2021-11-27 09:03:13