mvc library to distill concurrent programs into pure and
single-threaded programs using the
Controller pattern. The
mvc library makes pervasive purity practical.
mvc is guided by a single overarching design principle: application
architectures inspired by category theory scale in the large because they
reduce complexity and prevent proliferation of concepts. Use
mvc if you wish
to learn how to practically apply theory to tame large applications.
cabal install mvc
MVCmodule and the
Optionally begin from this program skeleton:
import MVC import qualified MVC.Prelude as MVC import qualified Pipes.Prelude as Pipes external :: Managed (View String, Controller String) external = do c1 <- MVC.stdinLines c2 <- MVC.tick 1 return (MVC.stdoutLines, c1 <> fmap show c2) model :: Model () String String model = asPipe (Pipes.takeWhile (/= "quit")) main :: IO () main = runMVC () model external
Determinism: Perform property-based testing on your model (like
Purity: Move a substantial amount of your application logic into pure code
Semantics: Equationally reason about your concurrency-free and pure core
Best practices: Statically enforce decoupling
Concise API: Only four types, and 8 primitive functions
Elegant semantics: Use practical category theory
Extensive Documentation: The haddocks contain extensive tips and idioms
The API is stable because I do not plan to generalize the API further. Any future generalizations will be released as separate libraries. The goal of this library is to serve as a stepping stone towards understanding more sophisticated and general application architectures, so I wish to preserve its simplicity for pedagogical reasons.
Future development will focus on building an ecosystem of pre-built
Controllers that applications can use, with a focus on tools useful for
user interfaces and games.
Build derived libraries
Copyright (c) 2014 Gabriel Gonzalez All rights reserved.
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