Popularity

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0.0

Stable

Stars 34

Watchers 7

Forks 3

Last Commit about 7 years ago

Monthly Downloads: 6

Programming language: Haskell

License: BSD 3-clause "New" or "Revised" License

Tags: Data

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Popular Comparisons

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