The most important aspect while working on a new system is its design. A poor initial design is always a leading cause of more challenges ahead. Rather than moaning later, solving errors, or applying patches to cover up a poor design, it is always wise not to rush through the design process, spend enough time, and have a flexible fool-proof design. This can only be achieved by understanding the requirements clearly. In this section, we will give a brief overview of shopping cart microservices; the problem we need to solve via microservices; and an overview of the business process, functional view, and deployment and design views.
The use case for our scenario is pretty straightforward. The following process diagram shows the end-to-end shopping process that we need to convert to microservices. The user adds an item to the cart, the inventory is updated, the user pays for the item, and then is able to check out. There are several...