59 lines
1.9 KiB
JavaScript
59 lines
1.9 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a comprehensive, efficient content blocker
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Copyright (C) 2014-present Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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'use strict';
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export class MRUCache {
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constructor(maxSize) {
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this.maxSize = maxSize;
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this.array = [];
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this.map = new Map();
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this.resetTime = Date.now();
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}
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add(key, value) {
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const found = this.map.has(key);
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this.map.set(key, value);
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if ( found ) { return; }
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if ( this.array.length === this.maxSize ) {
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this.map.delete(this.array.pop());
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}
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this.array.unshift(key);
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}
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remove(key) {
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if ( this.map.delete(key) === false ) { return; }
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this.array.splice(this.array.indexOf(key), 1);
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}
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lookup(key) {
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const value = this.map.get(key);
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if ( value === undefined ) { return; }
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if ( this.array[0] === key ) { return value; }
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const i = this.array.indexOf(key);
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this.array.copyWithin(1, 0, i);
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this.array[0] = key;
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return value;
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}
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reset() {
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this.array = [];
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this.map.clear();
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this.resetTime = Date.now();
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}
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}
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