82 lines
1.1 KiB
JavaScript
82 lines
1.1 KiB
JavaScript
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/*!
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* Connect - Cache
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* Copyright(c) 2011 Sencha Inc.
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* MIT Licensed
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*/
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/**
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* Expose `Cache`.
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*/
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module.exports = Cache;
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/**
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* LRU cache store.
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*
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* @param {Number} limit
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* @api private
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*/
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function Cache(limit) {
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this.store = {};
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this.keys = [];
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this.limit = limit;
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}
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/**
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* Touch `key`, promoting the object.
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*
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* @param {String} key
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* @param {Number} i
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* @api private
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*/
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Cache.prototype.touch = function(key, i){
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this.keys.splice(i,1);
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this.keys.push(key);
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};
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/**
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* Remove `key`.
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*
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* @param {String} key
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* @api private
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*/
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Cache.prototype.remove = function(key){
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delete this.store[key];
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};
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/**
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* Get the object stored for `key`.
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*
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* @param {String} key
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* @return {Array}
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* @api private
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*/
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Cache.prototype.get = function(key){
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return this.store[key];
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};
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/**
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* Add a cache `key`.
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*
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* @param {String} key
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* @return {Array}
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* @api private
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*/
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Cache.prototype.add = function(key){
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// initialize store
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var len = this.keys.push(key);
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// limit reached, invalidate LRU
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if (len > this.limit) this.remove(this.keys.shift());
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var arr = this.store[key] = [];
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arr.createdAt = new Date;
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return arr;
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};
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