X-cache

A finite key-value cache support multi cache algorithm (LRU, FIFO, LFU...).

Support cache algorithm

strategy	description	todo
fifo	First in First out (FIFO)
lru	Least Recently Used (LRU)
lru-k	Least Recently Used K (LRU-K)	todo
2q	Two queues (2Q)	todo
lfu	Least Frequently Used (LFU)
...	...	...

Usage

$ npm install x-cache --save

Example

import {LruXCache, XCache} from 'x-cache';
const cache = new LruXCache(1000);
// or
var XCache = require('x-cache').XCache;
var cache = new XCache('lru', {
    limit: 1000
});

cache.put('elwin', 1215);
cache.put('leon', 1233);
cache.put('tom', 1234);
cache.get('elwin'); // 1215
cache.find('elwin'); // true
cache.remove('elwin'); // true
cache.getSize(); // 2
cache.getArray(); // [1234, 1233]
cache.shift();
cache.forEach((v, k, obj) => console.log(v, k)); // 1234, tom
cache.removeAll();

API

new XCache(strategy, option)

Create a new cache instance.

• strategy: cache algorithm, such as lru, fifo..., you can see support cache algorithm for detail.
• option: it is not always same. if you use lru strategy, the option is {limit: 1000}.

new LruXCache(limit)

Create a new cache instance using LRU cache algorithm.

• limit: limit the size of cache

new LfuXCache(limit)

Create a new cache instance using LFU cache algorithm.

• limit: limit the size of cache

new FifoXCache(limit)

Create a new cache instance using FIFO cache algorithm.

• limit: limit the size of cache

XCache.prototype.put(key, value): Object entry

Put the value into the cache associated with key.

• key:
• value:

XCache.prototype.get(key): Object value

Returns the value associated with key or undefined if not in the cache.

• key:

XCache.prototype.shift(): Object entry

Such as array.shift().

XCache.prototype.find(key): Boolean bool

Check the key is whether in cache or not.

• key:

XCache.prototype.remove(key): Boolean bool

Remove the value associated with key, return true if remove successful.

• key:

XCache.prototype.removeAll()

Clear the cache.

XCache.prototype.getSize(): Number size

Returns the current size of the cache.

XCache.prototype.getArray(fromHead): Array array

Returns array {key, value}.

• fromHead: default false

XCache.prototype.forEach(callback, fromHead)

Iterator, callback(key, value, obj).

• fromHead: default false

Develop

$ npm install

$ npm run build

$ npm run test

Feedback

If you any questions, use Issues.

Sina Weibo: @赵小小峰

License

MIT Licence.