lattice_registers

Last-writer-wins and multi-value CRDT registers for Gleam.

Use this package when replicas need to store a single logical value and resolve concurrent writes deterministically or explicitly expose conflicts.

Installation

gleam add lattice_registers

Quick example

import lattice_core/replica_id
import lattice_registers/lww_register

pub fn main() {
  let node_a = replica_id.new("node-a")

  let register =
    lww_register.new("draft", 1, node_a)
    |> lww_register.set("published", 2)

  lww_register.value(register)
  // -> "published"
}

Modules

Module	Purpose
`lattice_registers/lww_register`	Last-writer-wins register. Higher timestamps win; equal timestamps use replica ID tie-breaking.
`lattice_registers/mv_register`	Multi-value register. Concurrent writes are preserved as multiple values.

Notes

LWWRegister exposes new, set, set_with_delta, merge, value, timestamp, replica_id, to_json, and from_json.
MVRegister exposes new, set, set_with_delta, merge, value, to_json, and from_json.
Use LWWRegister when a deterministic winner is acceptable.
Use MVRegister when application code should resolve concurrent writes.

License