The app-concepts diamond

An observation about a typical application's dependency graph

I find that when I break up an application into packages by feature, the dependency graph nearly always has this "diamond" shape:

Before I realized this, I struggled a lot. My naive impulse was to have four packages: "Feature 1", "Feature 2", "Feature 3", and a "Common" package for non-feature-specific stuff. This leads to one of three huge mistakes:

1. Depe…