Growing Object-Oriented Software, Guided by Tests

Chapter 17. Teasing Apart Main

In which we slice up our application, shuffling behavior around to isolate the XMPP and user interface code from the sniping logic. We achieve this incrementally, changing one concept at a time without breaking the whole application. We finally put a stake through the heart of notToBeGCd.

Finding a Role

We’ve convinced ourselves that we need to do some surgery on Main, but what do we want our improved Main to do?

For programs that are more than trivial, we like to think of our top-level class as a “matchmaker,” finding components and introducing them to each other. Once that job is done it drops into the background and waits for the application to finish. On a larger scale, this what the current generation of ...