48 lines
1.0 KiB
JavaScript
48 lines
1.0 KiB
JavaScript
"use strict";
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let cache1 = new Map();
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let cache2 = new Map();
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const keys = new WeakMap();
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function getKey(obj) {
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if (obj === null) return "null";
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else if (obj === undefined) return "undefined";
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const t = typeof obj;
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if (t === "number" || t === "boolean" || t === "string") return `${t}:${obj}`;
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if (t !== "function" && t !== "object")
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throw new Error(`Cannot memoize ${t} arguments`);
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let k = keys.get(obj);
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if (!k) {
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const rnd = Math.trunc(Math.random() * Number.MAX_SAFE_INTEGER);
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k = `${t}:${rnd.toString(36)}`;
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keys.set(obj, k);
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}
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return k;
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}
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function memoize(func) {
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return (...args) => {
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const key = JSON.stringify(args.map(getKey)) + getKey(func);
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if (cache1.has(key)) return cache1.get(key);
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let r;
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if (cache2.has(key)) r = cache2.get(key);
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else r = func(...args);
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cache1.set(key, r);
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return r;
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};
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}
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const interval = setInterval(() => {
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cache2 = cache1;
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cache1 = new Map();
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}, 120000);
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// Don't hold Node.js process
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if (interval.unref) interval.unref();
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module.exports = memoize;
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