Software Design X-Rays

Solutions: The Principles of Code Age

Here are the solutions to the exercises in Chapter 5, ​The Principles of Code Age​.

Cores All the Way Down

TensorFlow’s core/lib/core has low package cohesion and could be separated into smaller and more cohesive packages. The threadpool module would go into a concurrency package, while the arena and refcount modules are related to managing heap memory and could be contained together in a new allocation package.

Deep Mining: The Median Age of Code

To calculate a median value, we need to get the age of each individual line of code. This sounds like a job for git blame. We could even add the --porcelain option to make it easier to consume the output.