https://github.com/bravf/fast-blink
一种快照技术
https://github.com/bravf/fast-blink
Last synced: 6 months ago
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一种快照技术
- Host: GitHub
- URL: https://github.com/bravf/fast-blink
- Owner: bravf
- Created: 2020-01-08T07:25:33.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2020-01-08T11:06:21.000Z (over 6 years ago)
- Last Synced: 2025-10-29T21:45:27.100Z (9 months ago)
- Language: JavaScript
- Size: 2.93 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
Awesome Lists containing this project
README
## 一种快照技术
### Install
```
npm install --save fast-blink
```
### Basic usage:
```javascript
var data = {
foo: {
bar: {
a: ['a', 'b'],
b: 2,
c: ['x', 'y'],
e: 100 // deleted
}
},
buzz: 'hello'
}
var print = (object) => console.log(JSON.stringify(object), '\n')
print(data)
var {FastBlink} = require('fast-blink')
var myFastBlink = new FastBlink(data ,10)
data.foo.bar.b = 3
myFastBlink.push()
print('push:')
print(data)
data.foo.bar.a[2] = 100
data.foo.bar.c[2] = 'z'
data.buzz = 'world'
myFastBlink.push()
print('push:')
print(data)
print('records:')
print(myFastBlink.records)
print('undo:')
myFastBlink.undo()
print(data)
print('undo:')
myFastBlink.undo()
print(data)
print('redo:')
myFastBlink.redo()
print(data)
print('redo:')
myFastBlink.redo()
print(data)
print('undo:')
myFastBlink.undo()
print(data)
```
### Concepts:
一个有三个概念，别分是工作源、备份源、版本链。
工作源指向跟踪的数据本身，备份源指向当前版本的一个完整拷贝，版本链上的每一个节点保存一个diff数据，此 diff 数据包含两部 ```{leftDiff, rightDiff}```， 通过向前向后合并 diff 和当前源数据，可以得到某个版本的完整数据，从而实现快照功能。