{"id":16656278,"url":"https://github.com/derekkraan/delta_crdt_ex","last_synced_at":"2025-05-15T07:05:02.550Z","repository":{"id":46683470,"uuid":"132177214","full_name":"derekkraan/delta_crdt_ex","owner":"derekkraan","description":"Use DeltaCrdt to build distributed applications in 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DeltaCrdt\n\n[![Hex pm](http://img.shields.io/hexpm/v/delta_crdt.svg?style=flat)](https://hex.pm/packages/delta_crdt) [![CircleCI badge](https://circleci.com/gh/derekkraan/delta_crdt_ex.svg?style=svg)](https://circleci.com/gh/derekkraan/delta_crdt_ex)\n\nDeltaCrdt implements a key/value store using concepts from Delta CRDTs, and relies on [`MerkleMap`](https://github.com/derekkraan/merkle_map) for efficient synchronization.\n\nThere is a (slightly out of date) [introductory blog post](https://moosecode.nl/blog/how_deltacrdt_can_help_write_distributed_elixir_applications) and the (very much up to date) official documentation on [hexdocs.pm](https://hexdocs.pm/delta_crdt) is also very good.\n\nThe following papers have been used to implement this library:\n- [`Delta State Replicated Data Types – Almeida et al. 2016`](https://arxiv.org/pdf/1603.01529.pdf)\n- [`Efficient Synchronization of State-based CRDTs – Enes et al. 2018`](https://arxiv.org/pdf/1803.02750.pdf)\n\n## Usage\n\nDocumentation can be found on [hexdocs.pm](https://hexdocs.pm/delta_crdt).\n\nHere's a short example to illustrate adding an entry to a map:\n\n```elixir\n# start 2 Delta CRDTs\n{:ok, crdt1} = DeltaCrdt.start_link(DeltaCrdt.AWLWWMap)\n{:ok, crdt2} = DeltaCrdt.start_link(DeltaCrdt.AWLWWMap)\n\n# make them aware of each other\nDeltaCrdt.set_neighbours(crdt1, [crdt2])\n\n# show the initial value\nDeltaCrdt.read(crdt1)\n%{}\n\n# add a key/value in crdt1\nDeltaCrdt.put(crdt1, \"CRDT\", \"is magic!\")\nDeltaCrdt.put(crdt1, \"magic\", \"is awesome!\")\n\n# read it after it has been replicated to crdt2\nDeltaCrdt.read(crdt2)\n%{\"CRDT\" =\u003e \"is magic!\", \"magic\" =\u003e \"is awesome!\"}\n\n# get only a subset of keys\nDeltaCrdt.take(crdt2, [\"magic\"])\n%{\"magic\" =\u003e \"is awesome!\"}\n\n# get one value\nDeltaCrdt.get(crdt2, \"magic\")\n\"is awesome!\"\n\n# Other map-like functions are available, see the documentation for details.\n```\n\n⚠️ **Use atoms carefully** : Any atom contained in a key or value will be replicated across all nodes, and will never be garbage collected by the BEAM.\n\n## Telemetry metrics\n\nDeltaCrdt publishes the metric `[:delta_crdt, :sync, :done]`.\n\n## Installation\n\nThe package can be installed by adding `delta_crdt` to your list of dependencies in `mix.exs`:\n\n```elixir\ndef deps do\n  [\n    {:delta_crdt, \"~\u003e 0.6.3\"}\n  ]\nend\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fderekkraan%2Fdelta_crdt_ex","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fderekkraan%2Fdelta_crdt_ex","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fderekkraan%2Fdelta_crdt_ex/lists"}