The run-time impact of business functionality when decomposing and adopting the microservice architecture

Sammanfattning: In line with the growth of software, code bases are getting bigger and more complex. As a result of this, the architectural patterns, which systems rely upon, are becoming increasingly important. Recently, decomposed architectural styles have become a popular choice. This thesis explores system behavior with respect to decomposing system granularity and external communication between the resulting decomposed services. An e-commerce scenario was modeled and implemented at different granularity levels to measure the response time. In establishing the communication, both REST with HTTP and JSON and the gRPC framework were utilized. The results showed that decomposition has impact on run-time behaviour and external communication. The highest granularity level implemented with gRPC for communication establishment adds 10ms. In the context of how the web behaves today, it can be interpreted as feasible but there is no discussion yet on whether it is theoretically desirable.