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52 lines
1.0 KiB
52 lines
1.0 KiB
module.exports = function (max) {
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if (!max) throw Error('hashlru must have a max value, of type number, greater than 0')
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var size = 0, cache = Object.create(null), _cache = Object.create(null)
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function update (key, value) {
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cache[key] = value
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size ++
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if(size >= max) {
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size = 0
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_cache = cache
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cache = Object.create(null)
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}
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}
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return {
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has: function (key) {
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return cache[key] !== undefined || _cache[key] !== undefined
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},
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remove: function (key) {
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if(cache[key] !== undefined)
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cache[key] = undefined
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if(_cache[key] !== undefined)
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_cache[key] = undefined
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},
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get: function (key) {
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var v = cache[key]
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if(v !== undefined) return v
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if((v = _cache[key]) !== undefined) {
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update(key, v)
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return v
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}
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},
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set: function (key, value) {
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if(cache[key] !== undefined) cache[key] = value
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else update(key, value)
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},
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clear: function () {
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cache = Object.create(null)
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_cache = Object.create(null)
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}
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}
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}
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