Part 4 Refactorings

The fourth part of the book walks you through two refactoring exercises.

In chapter 10, we will design a scheduler interface that we can use to implement multiple concrete schedulers. We will then implement two schedulers: a round-robin scheduler to replace the version of it we implemented in chapter 7 and a more sophisticated scheduler called E-PVM. Then we will refactor the Manager object to use this interface.

In chapter 11, we will design a storage interface that allows us to implement multiple concrete storage components. Using this interface, we will implement in-memory and persistent storage components, and then we will refactor the worker and manager to use them.