75 lines
1.5 KiB
JavaScript
75 lines
1.5 KiB
JavaScript
/**
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* 简单 TTL 缓存
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* GH-GMP-005 · M1 · Notion Sync Layer
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*
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* 用于缓存人格页面、工单内容等，减少Notion API调用
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*/
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'use strict';
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const DEFAULT_TTL_MS = 10 * 60 * 1000; // 10分钟
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const DEFAULT_MAX_SIZE = 200;
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class TTLCache {
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/**
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* @param {object} [opts]
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* @param {number} [opts.ttlMs] - 缓存过期时间
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* @param {number} [opts.maxSize] - 最大缓存条目数
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*/
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constructor(opts = {}) {
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this.ttlMs = opts.ttlMs || DEFAULT_TTL_MS;
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this.maxSize = opts.maxSize || DEFAULT_MAX_SIZE;
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this._store = new Map();
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}
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get(key) {
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const entry = this._store.get(key);
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if (!entry) return undefined;
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if (Date.now() - entry.ts > this.ttlMs) {
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this._store.delete(key);
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return undefined;
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}
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return entry.value;
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}
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set(key, value) {
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// LRU-ish: 超过容量时删除最旧的
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if (this._store.size >= this.maxSize) {
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const oldest = this._store.keys().next().value;
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this._store.delete(oldest);
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}
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this._store.set(key, { value, ts: Date.now() });
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}
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has(key) {
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return this.get(key) !== undefined;
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}
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delete(key) {
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this._store.delete(key);
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}
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clear() {
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this._store.clear();
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}
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get size() {
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// 清理过期
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const now = Date.now();
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for (const [k, v] of this._store) {
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if (now - v.ts > this.ttlMs) this._store.delete(k);
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}
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return this._store.size;
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}
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get stats() {
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return {
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size: this.size,
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maxSize: this.maxSize,
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ttlMs: this.ttlMs,
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};
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}
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}
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module.exports = TTLCache;
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