export interface Cache<V = any> {
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value?: V;
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timeoutId?: ReturnType<typeof setTimeout>;
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time?: number;
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alive?: number;
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}
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const NOT_ALIVE = 0;
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export class Memory<T = any, V = any> {
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private cache: { [key in keyof T]?: Cache<V> } = {};
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private alive: number;
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constructor(alive = NOT_ALIVE) {
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// Unit second
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this.alive = alive * 1000;
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}
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get getCache() {
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return this.cache;
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}
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setCache(cache) {
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this.cache = cache;
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}
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// get<K extends keyof T>(key: K) {
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// const item = this.getItem(key);
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// const time = item?.time;
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// if (!isNil(time) && time < new Date().getTime()) {
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// this.remove(key);
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// }
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// return item?.value ?? undefined;
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// }
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get<K extends keyof T>(key: K) {
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return this.cache[key];
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}
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set<K extends keyof T>(key: K, value: V, expires?: number) {
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let item = this.get(key);
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if (!expires || (expires as number) <= 0) {
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expires = this.alive;
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}
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if (item) {
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if (item.timeoutId) {
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clearTimeout(item.timeoutId);
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item.timeoutId = undefined;
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}
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item.value = value;
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} else {
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item = { value, alive: expires };
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this.cache[key] = item;
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}
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if (!expires) {
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return value;
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}
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const now = new Date().getTime();
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/**
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* Prevent overflow of the setTimeout Maximum delay value
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* Maximum delay value 2,147,483,647 ms
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* https://developer.mozilla.org/en-US/docs/Web/API/setTimeout#maximum_delay_value
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*/
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item.time = expires > now ? expires : now + expires;
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item.timeoutId = setTimeout(
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() => {
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this.remove(key);
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},
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expires > now ? expires - now : expires,
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);
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return value;
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}
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remove<K extends keyof T>(key: K) {
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const item = this.get(key);
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Reflect.deleteProperty(this.cache, key);
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if (item) {
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clearTimeout(item.timeoutId!);
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return item.value;
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}
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}
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resetCache(cache: { [K in keyof T]: Cache }) {
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Object.keys(cache).forEach((key) => {
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const k = key as any as keyof T;
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const item = cache[k];
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if (item && item.time) {
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const now = new Date().getTime();
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const expire = item.time;
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if (expire > now) {
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this.set(k, item.value, expire);
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}
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}
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});
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}
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clear() {
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Object.keys(this.cache).forEach((key) => {
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const item = this.cache[key];
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item.timeoutId && clearTimeout(item.timeoutId);
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});
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this.cache = {};
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}
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}
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