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# js-crdt [![Build Status](https://travis-ci.org/widmogrod/js-crdt.svg?branch=master)](https://travis-ci.org/widmogrod/js-crdt) | ||
## Introduction | ||
CRDT Conflict-free Replication Data Type in JavaScript. | ||
Real time collaboration is a fascinating concept. | ||
Main purpose of this libriary it to explore applications of data structure called `CRDT` in context of real time collaboration | ||
and learn answers to questions like: | ||
|
||
## Development | ||
``` | ||
npm install | ||
npm run build | ||
npm test | ||
npm run lint | ||
npm run dist | ||
``` | ||
- How to write collaborative applications? | ||
- How to ensure strong eventual consistency? | ||
- What are limirations of CRDTs? | ||
|
||
## How `crdt/Text` type with `order/discrete` should work? (WIP) | ||
Consider two actors `a` and `b` working concurrently on some document. | ||
Actor `a` and `b` have __same origin__ of the document `origin:0`. | ||
For simplification, origin is not shown here. | ||
> CRDT stands for Conflict-free Replication Data Type in JavaScript. | ||
``` | ||
a:0 | ||
b:0 | ||
``` | ||
## Components | ||
Compoents that can be found in this libriary: | ||
|
||
First actor started working on version `a:0`, and did some changes `xxx`. | ||
Actor `b` did not start working on document. | ||
``` | ||
a:0 xxx | ||
b:0 | ||
``` | ||
- Data structures like `Immutable SortedSet`, `Immutable Lists`, `Immutable Maps` | ||
- Partial ordering algorithms like `Vector clock` | ||
- Higher order component `text` that encapsulates operation on plain text that can be used in collaborative editing. | ||
|
||
Actor `a` decided to send his version `a:1` to actor `b`, | ||
but before that, he want to be sure that regardless if `b` receives his changes, he can continue on working his version of document. | ||
so he created a snapshot `a:1` of his version of document and send changes to actor `b`. | ||
## Applications | ||
- https://github.com/widmogrod/notepad-app - Collaborative notepad app (demo). | ||
|
||
``` | ||
a:0 xxx a:1 | ||
b:0 | ||
``` | ||
|
||
Actor `b` sees incoming changes `a:0` of the actor `a`, | ||
so he merge them with his current state and create new version it `b:1 a:0` | ||
``` | ||
a:0 xxx a:1 | ||
| | ||
b:0 b:1 a:0 | ||
``` | ||
|
||
Actor `b` decides to add something to document `yyy`, and send his changes to actor `a`. | ||
Actor `b` in the same manner, before sending his changes to actor `a` | ||
he creates snapshot of his version of document `b:2 a:0` and send changes `b:1 a:0` to `a`. | ||
## Development | ||
Basic development requires at least `nodejs@8`. | ||
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||
To quickly start developmen run: | ||
``` | ||
a:0 xxx a:1 | ||
| | ||
b:0 b:1 a:0 yyy b:2 a:0 | ||
npm install --only=dev | ||
npm test | ||
``` | ||
|
||
When actor `a` sees incoming changes, he merge them with his document. | ||
Before pull request run following commands to ensure code quality: | ||
``` | ||
a:0 xxx a:1 a:2 b:1 | ||
| | | ||
b:0 b:1 a:0 yyy b:2 a:0 | ||
npm test | ||
npm run lint | ||
npm run dist | ||
``` |
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