46 lines
1.1 KiB
JavaScript
46 lines
1.1 KiB
JavaScript
'use strict';
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module.exports = {
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_cache: {},
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_count: 0,
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_eraseIndex: 0,
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_usedList: {},
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_usedIndex: {},
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_CACHE_SIZE: 5000,
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get: function(xkey, number, hardened) {
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hardened = !!hardened;
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var key = xkey + '/' + number + '/' + hardened;
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if (this._cache[key]) {
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this._cacheHit(key);
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return this._cache[key];
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}
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},
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set: function(xkey, number, hardened, derived) {
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hardened = !!hardened;
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var key = xkey + '/' + number + '/' + hardened;
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this._cache[key] = derived;
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this._cacheHit(key);
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},
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_cacheHit: function(key) {
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if (this._usedIndex[key]) {
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delete this._usedList[this._usedIndex[key]];
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}
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this._usedList[this._count] = key;
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this._usedIndex[key] = this._count;
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this._count++;
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this._cacheRemove();
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},
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_cacheRemove: function() {
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while (this._eraseIndex < this._count - this._CACHE_SIZE) {
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if (this._usedList[this._eraseIndex]) {
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var removeKey = this._usedList[this._eraseIndex];
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delete this._usedIndex[removeKey];
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delete this._cache[removeKey];
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}
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delete this._usedList[this._eraseIndex];
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this._eraseIndex++;
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}
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}
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};
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