34 lines
732 B
JavaScript
34 lines
732 B
JavaScript
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function Cache() {
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this._store = {};
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}
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Cache.prototype.get = function(key) {
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key = this._serialize(key);
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return key in this._store ? this._store[key] : undefined;
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};
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Cache.prototype.set = function(key, value) {
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key = this._serialize(key);
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this._store[key] = value;
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return this;
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};
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Cache.prototype._serialize = function(mixedKey) {
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var json = JSON.stringify(mixedKey);
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return this._hash(json);
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};
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Cache.prototype._hash = function(str) {
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var hash = 0, i, chr, len;
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if (str.length === 0) return hash;
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for (i = 0, len = str.length; i < len; i++) {
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chr = str.charCodeAt(i);
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hash = ((hash << 5) - hash) + chr;
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hash |= 0; // Convert to 32bit integer
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}
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return hash;
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};
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module.exports = Cache;
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