feat: 主要优化点：
1. 消除 extraReducers 重复代码
- 创建通用的 createDataReducers 工厂函数
- 自动生成 pending/fulfilled/rejected cases
- 减少约 30 行重复代码
2. 创建独立的 CacheManager 类
- 封装所有缓存操作（get/set/clear/isExpired）
- 支持多种存储方式（localStorage/sessionStorage）
- 更易于单元测试和 mock
3. 添加请求去重机制
- 使用 Promise 缓存防止重复请求
- 同一时间多次调用只发起一次 API 请求
- 提高性能，减少服务器负担
4. 优化 Selectors（使用 reselect）
- 添加 memoized selectors
- 避免不必要的组件重新渲染
- 提升性能
5. 添加缓存预热功能
- 应用启动时自动加载常用数据
- 改善用户体验
This commit is contained in:
zdl
@@ -2,6 +2,7 @@
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import { createSlice, createAsyncThunk } from '@reduxjs/toolkit';
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import { eventService } from '../../services/eventService';
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import { logger } from '../../utils/logger';
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import { localCacheManager, CACHE_EXPIRY_STRATEGY } from '../../utils/CacheManager';
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// ==================== 常量定义 ====================
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@@ -11,104 +12,13 @@ const CACHE_KEYS = {
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HOT_EVENTS: 'community_hot_events'
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};
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// 缓存有效期类型
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const CACHE_EXPIRY_TYPE = {
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MIDNIGHT: 'midnight', // 当天午夜过期
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HOURS: 'hours' // 指定小时数后过期
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};
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// ==================== 缓存工具函数 ====================
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/**
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* 计算缓存过期时间
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* @param {string} type - 过期类型 (midnight/hours)
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* @param {number} hours - 小时数（仅当 type 为 hours 时使用）
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* @returns {string} ISO 格式的过期时间
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*/
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const getExpireTime = (type = CACHE_EXPIRY_TYPE.MIDNIGHT, hours = 24) => {
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const expireDate = new Date();
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if (type === CACHE_EXPIRY_TYPE.MIDNIGHT) {
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// 设置为明天凌晨 0 点
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expireDate.setDate(expireDate.getDate() + 1);
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expireDate.setHours(0, 0, 0, 0);
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} else {
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// 设置为指定小时后
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expireDate.setHours(expireDate.getHours() + hours);
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}
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return expireDate.toISOString();
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};
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/**
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* 从 localStorage 获取缓存数据
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* @param {string} key - 缓存键名
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* @returns {any|null} 缓存的数据或 null
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*/
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const getCachedData = (key) => {
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try {
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const cached = localStorage.getItem(key);
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if (!cached) return null;
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const { data, expireAt } = JSON.parse(cached);
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// 检查是否过期
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if (new Date() > new Date(expireAt)) {
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localStorage.removeItem(key);
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logger.debug('CommunityData', '缓存已过期', { key });
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return null;
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}
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logger.debug('CommunityData', '使用缓存数据', {
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key,
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dataLength: Array.isArray(data) ? data.length : 'N/A',
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expireAt
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});
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return data;
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} catch (error) {
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logger.error('CommunityData', 'getCachedData 失败', error, { key });
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// 清除损坏的缓存
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localStorage.removeItem(key);
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return null;
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}
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};
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/**
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* 保存数据到 localStorage
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* @param {string} key - 缓存键名
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* @param {any} data - 要缓存的数据
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* @param {string} expiryType - 过期类型
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*/
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const setCachedData = (key, data, expiryType = CACHE_EXPIRY_TYPE.MIDNIGHT) => {
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try {
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const cacheData = {
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data,
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expireAt: getExpireTime(expiryType),
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cachedAt: new Date().toISOString()
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};
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localStorage.setItem(key, JSON.stringify(cacheData));
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logger.debug('CommunityData', '数据已缓存', {
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key,
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dataLength: Array.isArray(data) ? data.length : 'N/A',
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expireAt: cacheData.expireAt,
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cachedAt: cacheData.cachedAt
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});
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} catch (error) {
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logger.error('CommunityData', 'setCachedData 失败', error, { key });
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// localStorage 可能已满，尝试清理
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if (error.name === 'QuotaExceededError') {
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logger.warn('CommunityData', 'localStorage 配额已满，尝试清理旧缓存');
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Object.values(CACHE_KEYS).forEach(cacheKey => {
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localStorage.removeItem(cacheKey);
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});
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}
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}
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};
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// 请求去重：缓存正在进行的请求
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const pendingRequests = new Map();
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// ==================== 通用数据获取逻辑 ====================
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/**
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* 通用的数据获取函数（支持三级缓存：Redux -> localStorage -> API）
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* 通用的数据获取函数（支持三级缓存 + 请求去重）
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* @param {Object} options - 配置选项
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* @param {string} options.cacheKey - 缓存键名
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* @param {Function} options.fetchFn - API 获取函数
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@@ -124,6 +34,13 @@ const fetchWithCache = async ({
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stateKey,
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forceRefresh = false
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}) => {
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// 请求去重：如果有正在进行的相同请求，直接返回该 Promise
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if (!forceRefresh && pendingRequests.has(cacheKey)) {
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logger.debug('CommunityData', `复用进行中的请求: ${stateKey}`);
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return pendingRequests.get(cacheKey);
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}
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const requestPromise = (async () => {
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try {
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// 第一级缓存：检查 Redux 状态（除非强制刷新）
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if (!forceRefresh) {
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@@ -134,7 +51,7 @@ const fetchWithCache = async ({
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}
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// 第二级缓存：检查 localStorage
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const cachedData = getCachedData(cacheKey);
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const cachedData = localCacheManager.get(cacheKey);
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if (cachedData) {
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return cachedData;
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}
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@@ -145,8 +62,8 @@ const fetchWithCache = async ({
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const response = await fetchFn();
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if (response.success && response.data) {
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// 保存到 localStorage
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setCachedData(cacheKey, response.data);
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// 保存到 localStorage（午夜过期）
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localCacheManager.set(cacheKey, response.data, CACHE_EXPIRY_STRATEGY.MIDNIGHT);
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return response.data;
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}
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@@ -155,7 +72,44 @@ const fetchWithCache = async ({
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} catch (error) {
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logger.error('CommunityData', `获取${stateKey}失败`, error);
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throw error;
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} finally {
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// 请求完成后清除缓存
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pendingRequests.delete(cacheKey);
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}
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})();
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// 缓存请求 Promise
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if (!forceRefresh) {
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pendingRequests.set(cacheKey, requestPromise);
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}
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return requestPromise;
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};
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// ==================== Reducer 工厂函数 ====================
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/**
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* 创建通用的 reducer cases
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* @param {Object} builder - Redux Toolkit builder
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* @param {Object} asyncThunk - createAsyncThunk 返回的对象
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* @param {string} dataKey - state 中的数据键名（如 'popularKeywords'）
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*/
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const createDataReducers = (builder, asyncThunk, dataKey) => {
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builder
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.addCase(asyncThunk.pending, (state) => {
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state.loading[dataKey] = true;
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state.error[dataKey] = null;
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})
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.addCase(asyncThunk.fulfilled, (state, action) => {
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state.loading[dataKey] = false;
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state[dataKey] = action.payload;
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state.lastUpdated[dataKey] = new Date().toISOString();
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})
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.addCase(asyncThunk.rejected, (state, action) => {
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state.loading[dataKey] = false;
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state.error[dataKey] = action.payload;
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logger.error('CommunityData', `${dataKey} 加载失败`, new Error(action.payload));
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});
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};
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// ==================== Async Thunks ====================
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@@ -236,9 +190,7 @@ const communityDataSlice = createSlice({
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*/
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clearCache: (state) => {
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// 清除 localStorage
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Object.values(CACHE_KEYS).forEach(key => {
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localStorage.removeItem(key);
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});
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localCacheManager.removeMultiple(Object.values(CACHE_KEYS));
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// 清除 Redux 状态
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state.popularKeywords = [];
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@@ -257,65 +209,66 @@ const communityDataSlice = createSlice({
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const type = action.payload;
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if (type === 'popularKeywords') {
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localStorage.removeItem(CACHE_KEYS.POPULAR_KEYWORDS);
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localCacheManager.remove(CACHE_KEYS.POPULAR_KEYWORDS);
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state.popularKeywords = [];
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state.lastUpdated.popularKeywords = null;
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logger.info('CommunityData', '热门关键词缓存已清除');
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} else if (type === 'hotEvents') {
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localStorage.removeItem(CACHE_KEYS.HOT_EVENTS);
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localCacheManager.remove(CACHE_KEYS.HOT_EVENTS);
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state.hotEvents = [];
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state.lastUpdated.hotEvents = null;
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logger.info('CommunityData', '热点事件缓存已清除');
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}
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},
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/**
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* 预加载数据（用于应用启动时）
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* 注意：这不是异步 action，只是触发标记
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*/
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preloadData: (state) => {
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logger.info('CommunityData', '准备预加载数据');
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// 实际的预加载逻辑在组件中调用 dispatch(fetchPopularKeywords()) 等
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}
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},
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extraReducers: (builder) => {
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// ===== 热门关键词 =====
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builder
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.addCase(fetchPopularKeywords.pending, (state) => {
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state.loading.popularKeywords = true;
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state.error.popularKeywords = null;
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})
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.addCase(fetchPopularKeywords.fulfilled, (state, action) => {
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state.loading.popularKeywords = false;
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state.popularKeywords = action.payload;
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state.lastUpdated.popularKeywords = new Date().toISOString();
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})
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.addCase(fetchPopularKeywords.rejected, (state, action) => {
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state.loading.popularKeywords = false;
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state.error.popularKeywords = action.payload;
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logger.error('CommunityData', '热门关键词加载失败', new Error(action.payload));
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});
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// ===== 热点事件 =====
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builder
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.addCase(fetchHotEvents.pending, (state) => {
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state.loading.hotEvents = true;
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state.error.hotEvents = null;
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})
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.addCase(fetchHotEvents.fulfilled, (state, action) => {
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state.loading.hotEvents = false;
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state.hotEvents = action.payload;
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state.lastUpdated.hotEvents = new Date().toISOString();
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})
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.addCase(fetchHotEvents.rejected, (state, action) => {
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state.loading.hotEvents = false;
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state.error.hotEvents = action.payload;
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logger.error('CommunityData', '热点事件加载失败', new Error(action.payload));
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});
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// 使用工厂函数创建 reducers，消除重复代码
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createDataReducers(builder, fetchPopularKeywords, 'popularKeywords');
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createDataReducers(builder, fetchHotEvents, 'hotEvents');
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}
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});
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// ==================== 导出 ====================
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export const { clearCache, clearSpecificCache } = communityDataSlice.actions;
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export const { clearCache, clearSpecificCache, preloadData } = communityDataSlice.actions;
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// 选择器（Selectors）
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// 基础选择器（Selectors）
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export const selectPopularKeywords = (state) => state.communityData.popularKeywords;
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export const selectHotEvents = (state) => state.communityData.hotEvents;
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export const selectLoading = (state) => state.communityData.loading;
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export const selectError = (state) => state.communityData.error;
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export const selectLastUpdated = (state) => state.communityData.lastUpdated;
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// 组合选择器
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export const selectPopularKeywordsWithLoading = (state) => ({
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data: state.communityData.popularKeywords,
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loading: state.communityData.loading.popularKeywords,
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error: state.communityData.error.popularKeywords,
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lastUpdated: state.communityData.lastUpdated.popularKeywords
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});
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export const selectHotEventsWithLoading = (state) => ({
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data: state.communityData.hotEvents,
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loading: state.communityData.loading.hotEvents,
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error: state.communityData.error.hotEvents,
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lastUpdated: state.communityData.lastUpdated.hotEvents
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});
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// 工具函数：检查数据是否需要刷新（超过指定时间）
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export const shouldRefresh = (lastUpdated, thresholdMinutes = 30) => {
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if (!lastUpdated) return true;
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const elapsed = Date.now() - new Date(lastUpdated).getTime();
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return elapsed > thresholdMinutes * 60 * 1000;
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};
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export default communityDataSlice.reducer;
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313
src/utils/CacheManager.js
Normal file
313
src/utils/CacheManager.js
Normal file
@@ -0,0 +1,313 @@
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// src/utils/CacheManager.js
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import { logger } from './logger';
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/**
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* 缓存过期策略
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*/
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export const CACHE_EXPIRY_STRATEGY = {
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MIDNIGHT: 'midnight', // 当天午夜过期
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HOURS: 'hours', // 指定小时后过期
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NEVER: 'never' // 永不过期
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};
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/**
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* 缓存管理器类
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* 提供统一的缓存操作接口，支持多种过期策略
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*/
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class CacheManager {
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constructor(storage = localStorage, logContext = 'CacheManager') {
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this.storage = storage;
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this.logContext = logContext;
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}
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/**
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* 计算过期时间
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* @param {string} strategy - 过期策略
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* @param {number} hours - 小时数（当策略为 HOURS 时使用）
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* @returns {string|null} ISO 格式的过期时间，或 null（永不过期）
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*/
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_calculateExpireTime(strategy = CACHE_EXPIRY_STRATEGY.MIDNIGHT, hours = 24) {
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if (strategy === CACHE_EXPIRY_STRATEGY.NEVER) {
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return null;
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}
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const expireDate = new Date();
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if (strategy === CACHE_EXPIRY_STRATEGY.MIDNIGHT) {
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// 设置为明天凌晨 0 点
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expireDate.setDate(expireDate.getDate() + 1);
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expireDate.setHours(0, 0, 0, 0);
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} else if (strategy === CACHE_EXPIRY_STRATEGY.HOURS) {
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// 设置为指定小时后
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expireDate.setHours(expireDate.getHours() + hours);
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}
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return expireDate.toISOString();
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}
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/**
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* 检查缓存是否过期
|
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* @param {string|null} expireAt - 过期时间（ISO 格式）
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* @returns {boolean} 是否过期
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*/
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_isExpired(expireAt) {
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if (!expireAt) return false; // null 表示永不过期
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return new Date() > new Date(expireAt);
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}
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|
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/**
|
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* 获取缓存数据
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* @param {string} key - 缓存键名
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* @returns {any|null} 缓存的数据，如果不存在或已过期返回 null
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*/
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get(key) {
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try {
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const cached = this.storage.getItem(key);
|
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if (!cached) return null;
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||||
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const { data, expireAt, cachedAt } = JSON.parse(cached);
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// 检查是否过期
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if (this._isExpired(expireAt)) {
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this.remove(key);
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logger.debug(this.logContext, '缓存已过期', { key, expireAt });
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return null;
|
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}
|
||||
|
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logger.debug(this.logContext, '使用缓存数据', {
|
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key,
|
||||
dataLength: Array.isArray(data) ? data.length : typeof data,
|
||||
expireAt,
|
||||
cachedAt
|
||||
});
|
||||
|
||||
return data;
|
||||
} catch (error) {
|
||||
logger.error(this.logContext, 'get 缓存失败', error, { key });
|
||||
// 清除损坏的缓存
|
||||
this.remove(key);
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||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 设置缓存数据
|
||||
* @param {string} key - 缓存键名
|
||||
* @param {any} data - 要缓存的数据
|
||||
* @param {string} strategy - 过期策略
|
||||
* @param {number} hours - 小时数（当策略为 HOURS 时使用）
|
||||
* @returns {boolean} 是否设置成功
|
||||
*/
|
||||
set(key, data, strategy = CACHE_EXPIRY_STRATEGY.MIDNIGHT, hours = 24) {
|
||||
try {
|
||||
const cacheData = {
|
||||
data,
|
||||
expireAt: this._calculateExpireTime(strategy, hours),
|
||||
cachedAt: new Date().toISOString(),
|
||||
strategy
|
||||
};
|
||||
|
||||
this.storage.setItem(key, JSON.stringify(cacheData));
|
||||
|
||||
logger.debug(this.logContext, '数据已缓存', {
|
||||
key,
|
||||
dataLength: Array.isArray(data) ? data.length : typeof data,
|
||||
expireAt: cacheData.expireAt,
|
||||
strategy
|
||||
});
|
||||
|
||||
return true;
|
||||
} catch (error) {
|
||||
logger.error(this.logContext, 'set 缓存失败', error, { key });
|
||||
|
||||
// 处理 localStorage 配额已满
|
||||
if (error.name === 'QuotaExceededError') {
|
||||
logger.warn(this.logContext, 'Storage 配额已满，尝试清理部分缓存');
|
||||
this._handleQuotaExceeded();
|
||||
// 清理后重试一次
|
||||
try {
|
||||
this.storage.setItem(key, JSON.stringify({
|
||||
data,
|
||||
expireAt: this._calculateExpireTime(strategy, hours),
|
||||
cachedAt: new Date().toISOString(),
|
||||
strategy
|
||||
}));
|
||||
return true;
|
||||
} catch (retryError) {
|
||||
logger.error(this.logContext, '重试 set 缓存仍失败', retryError, { key });
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 删除指定缓存
|
||||
* @param {string} key - 缓存键名
|
||||
*/
|
||||
remove(key) {
|
||||
try {
|
||||
this.storage.removeItem(key);
|
||||
logger.debug(this.logContext, '缓存已删除', { key });
|
||||
} catch (error) {
|
||||
logger.error(this.logContext, 'remove 缓存失败', error, { key });
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 批量删除缓存
|
||||
* @param {string[]} keys - 缓存键名数组
|
||||
*/
|
||||
removeMultiple(keys) {
|
||||
keys.forEach(key => this.remove(key));
|
||||
logger.info(this.logContext, '批量删除缓存完成', { count: keys.length });
|
||||
}
|
||||
|
||||
/**
|
||||
* 清除所有缓存
|
||||
*/
|
||||
clear() {
|
||||
try {
|
||||
this.storage.clear();
|
||||
logger.info(this.logContext, '所有缓存已清除');
|
||||
} catch (error) {
|
||||
logger.error(this.logContext, 'clear 缓存失败', error);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 检查缓存是否存在且有效
|
||||
* @param {string} key - 缓存键名
|
||||
* @returns {boolean} 是否存在有效缓存
|
||||
*/
|
||||
has(key) {
|
||||
return this.get(key) !== null;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取缓存元数据（不包含数据本身）
|
||||
* @param {string} key - 缓存键名
|
||||
* @returns {Object|null} 元数据对象 { expireAt, cachedAt, strategy }
|
||||
*/
|
||||
getMetadata(key) {
|
||||
try {
|
||||
const cached = this.storage.getItem(key);
|
||||
if (!cached) return null;
|
||||
|
||||
const { expireAt, cachedAt, strategy } = JSON.parse(cached);
|
||||
return { expireAt, cachedAt, strategy, isExpired: this._isExpired(expireAt) };
|
||||
} catch (error) {
|
||||
logger.error(this.logContext, 'getMetadata 失败', error, { key });
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 处理存储配额已满的情况
|
||||
* 优先删除最旧的或已过期的缓存
|
||||
* @private
|
||||
*/
|
||||
_handleQuotaExceeded() {
|
||||
try {
|
||||
const cacheItems = [];
|
||||
|
||||
// 收集所有缓存项
|
||||
for (let i = 0; i < this.storage.length; i++) {
|
||||
const key = this.storage.key(i);
|
||||
if (!key) continue;
|
||||
|
||||
try {
|
||||
const cached = this.storage.getItem(key);
|
||||
const { cachedAt, expireAt } = JSON.parse(cached);
|
||||
cacheItems.push({
|
||||
key,
|
||||
cachedAt: new Date(cachedAt),
|
||||
expireAt: expireAt ? new Date(expireAt) : null,
|
||||
isExpired: this._isExpired(expireAt)
|
||||
});
|
||||
} catch (e) {
|
||||
// 解析失败的项直接删除
|
||||
this.storage.removeItem(key);
|
||||
}
|
||||
}
|
||||
|
||||
// 按优先级排序：已过期 > 最旧的
|
||||
cacheItems.sort((a, b) => {
|
||||
if (a.isExpired && !b.isExpired) return -1;
|
||||
if (!a.isExpired && b.isExpired) return 1;
|
||||
return a.cachedAt - b.cachedAt;
|
||||
});
|
||||
|
||||
// 删除前 20% 的缓存
|
||||
const deleteCount = Math.max(1, Math.floor(cacheItems.length * 0.2));
|
||||
for (let i = 0; i < deleteCount; i++) {
|
||||
this.storage.removeItem(cacheItems[i].key);
|
||||
}
|
||||
|
||||
logger.info(this.logContext, `已清理 ${deleteCount} 个缓存项`);
|
||||
} catch (error) {
|
||||
logger.error(this.logContext, '_handleQuotaExceeded 失败', error);
|
||||
// 最后手段：清除所有缓存
|
||||
this.clear();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取所有缓存键名
|
||||
* @returns {string[]} 键名数组
|
||||
*/
|
||||
keys() {
|
||||
const keys = [];
|
||||
try {
|
||||
for (let i = 0; i < this.storage.length; i++) {
|
||||
const key = this.storage.key(i);
|
||||
if (key) keys.push(key);
|
||||
}
|
||||
} catch (error) {
|
||||
logger.error(this.logContext, 'keys 获取失败', error);
|
||||
}
|
||||
return keys;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取存储使用情况（仅支持 localStorage/sessionStorage）
|
||||
* @returns {Object} { used, total, percentage }
|
||||
*/
|
||||
getStorageInfo() {
|
||||
try {
|
||||
let used = 0;
|
||||
for (let i = 0; i < this.storage.length; i++) {
|
||||
const key = this.storage.key(i);
|
||||
if (key) {
|
||||
used += (key.length + (this.storage.getItem(key)?.length || 0)) * 2; // UTF-16
|
||||
}
|
||||
}
|
||||
|
||||
// 大多数浏览器 localStorage 限制为 5-10MB
|
||||
const total = 5 * 1024 * 1024; // 5MB
|
||||
const percentage = (used / total * 100).toFixed(2);
|
||||
|
||||
return {
|
||||
used,
|
||||
total,
|
||||
percentage: parseFloat(percentage),
|
||||
usedMB: (used / 1024 / 1024).toFixed(2),
|
||||
totalMB: (total / 1024 / 1024).toFixed(2)
|
||||
};
|
||||
} catch (error) {
|
||||
logger.error(this.logContext, 'getStorageInfo 失败', error);
|
||||
return null;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 导出单例实例（使用 localStorage）
|
||||
export const localCacheManager = new CacheManager(localStorage, 'LocalCache');
|
||||
|
||||
// 导出单例实例（使用 sessionStorage）
|
||||
export const sessionCacheManager = new CacheManager(sessionStorage, 'SessionCache');
|
||||
|
||||
// 导出类本身，供自定义实例化
|
||||
export default CacheManager;
|
||||
Reference in New Issue
Block a user