That’s the classical Modular Software Design. What it misses, though, is testability. If a business-module has a lot of complex business logic, it cannot be easily tested, since the business logic is mixed with the untestable infrastructure code (e.g. file system or network calls) that lies in the same module. So we need to introduce a separation, and that’s where Infrastructure-Modules come into play.
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Although MIM is simple, I felt that the benefits of the new approach might not be obvious without good examples. Additionally, I realized I couldn’t just use terms and concepts from Modular Software Design without explanation, because they have lost their original meaning and, for many people, become mere clichés. This is because there aren’t really many good, modern resources on this subject. These were the reasons that convinced me to introduce the lengthy “Example application” and “Introduction to Modular Design” chapters.