Nullables Livestream #3: Fetcher Nullability

In this weekly livestream series, I pair up with Ted M. Young, aka jitterted, to look at Nullables and A-Frame Architecture as an alternative to Mocks, Spies, and Hexagonal Architecture. Each episode combines a healthy dose of architecture and design discussion with hands-on coding.

In this episode...

We start our work on the HttpAverageScoreFetcher and HttpScoreCategoryNotifier classes. These adapters are part of Ted’s implementation of Hexagonal Architecture: they retrieve and store data from a separate “Yacht Tracker” service. We spend some time understanding how hexagonal architecture works, then make HttpAverageScoreFetcher nullable. Along the way, we demonstrate the plusses—and minuses!—of using an embedded stub.

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