frdomain-extras
Additional accompaniment to Functional and Reactive Domain Modeling code samples. The idea is to introduce some of the implementations which are currently not covered in the text or the code samples.
IO
None of the libraries available during the preparation of the book contained a robust implementation of IO - hence the topic was not discussed in the book. However, in recent times, we are looking at quite a few IO implementations like ..
- cats IO as part the cats-effect library
- monix Task as part of the monix library
- zio as part of the scalaz ecosystem
This accompaniment contains an implementation of the following usecases as part of demonstrating the idea of using the principles of functional programming while implementing domain models with side-effects.
Chapter 6 of the book contains complete implementations of reactive domain models using the various flavors of non blocking paradigms - scala.concurrent.Future, scalaz.concurrent.Task etc. I take these implementations to the next step by making them more algebraic, more referentially transparent and more compositional.
The build in this project now contains 2 implementations:
- Implementation of the domain model using cats-effect IO
- Same domain model based on the tagless final approach, with the following concrete implementations:
- cats-effect IO
- Monix Task
This implementation of tagless final closely follows the approach that I discussed in one of the blog posts quite some time back.