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Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
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README
A Conflict-Free Replicated JSON Datatype for Haskell
crjdt-haskell provides high level interface to CRDT which is formalised in the paper by Martin Kleppmann and Alastair R. Beresford.
Documentation
See haddocks.
Example
{-# LANGUAGE OverloadedStrings #-}
module Main where
import Data.Crjdt as C
-- Original state
original :: Command ()
original = doc .> key "key" =: "A"
-- First replica updates doc["key"] to "B"
replica1 :: Command ()
replica1 = original *> doc .> key "key" =: "B"
-- Second replica updates doc["key"] to "C"
replica2 :: Command ()
replica2 = original *> doc .> key "key" =: "C"
main :: IO ()
main = do
-- Sync first and second replica
let Right (r1, r2) = sync (1, replica1) (2, replica2)
let replica1' = execEval 1 r1
replica2' = execEval 2 r2
-- Both replicas converge to: {"key": {"B", "C"}}
print (document replica1' == document replica2') -- True
Future work
- Improve documentation
- Aeson support
- Simplify API as described in second version of the paper
Other implementations
LICENSE
Copyright © 2017-2018 Amar Potghan
Distributed under BSD License.
*Note that all licence references and agreements mentioned in the crjdt-haskell README section above
are relevant to that project's source code only.