91 lines
2.7 KiB
Dart
91 lines
2.7 KiB
Dart
import 'dart:convert';
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import 'package:shared_preferences/shared_preferences.dart';
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/// 时间: 2026-03-30
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/// 功能: 本地缓存管理器
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/// 介绍: 管理应用的本地缓存数据，包括排行榜数据等
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/// 最新变化: 新建本地缓存管理器
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class LocalCacheManager {
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static final LocalCacheManager _instance = LocalCacheManager._internal();
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factory LocalCacheManager() => _instance;
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LocalCacheManager._internal();
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static const String _preloadEnabledKey = 'preload_enabled';
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static const String _popularListCachePrefix = 'popular_list_cache_';
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/// 获取预加载开关状态
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Future<bool> isPreloadEnabled() async {
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final prefs = await SharedPreferences.getInstance();
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return prefs.getBool(_preloadEnabledKey) ?? true;
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}
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/// 设置预加载开关状态
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Future<void> setPreloadEnabled(bool enabled) async {
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final prefs = await SharedPreferences.getInstance();
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await prefs.setBool(_preloadEnabledKey, enabled);
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}
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/// 缓存排行榜数据
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Future<void> cachePopularList(
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String type,
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List<Map<String, dynamic>> data,
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) async {
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final prefs = await SharedPreferences.getInstance();
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final key = _popularListCachePrefix + type;
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final jsonData = jsonEncode(data);
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await prefs.setString(key, jsonData);
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final timestampKey = '${key}_timestamp';
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await prefs.setInt(timestampKey, DateTime.now().millisecondsSinceEpoch);
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}
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/// 获取缓存的排行榜数据
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Future<List<Map<String, dynamic>>?> getCachedPopularList(String type) async {
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final prefs = await SharedPreferences.getInstance();
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final key = _popularListCachePrefix + type;
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final jsonData = prefs.getString(key);
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if (jsonData == null) {
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return null;
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}
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try {
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final decoded = jsonDecode(jsonData);
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if (decoded is List) {
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return decoded.cast<Map<String, dynamic>>();
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}
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} catch (e) {
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// 解析失败
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}
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return null;
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}
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/// 获取缓存时间戳
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Future<int?> getCacheTimestamp(String type) async {
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final prefs = await SharedPreferences.getInstance();
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final key = '${_popularListCachePrefix}${type}_timestamp';
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return prefs.getInt(key);
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}
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/// 清除指定类型的缓存
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Future<void> clearCache(String type) async {
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final prefs = await SharedPreferences.getInstance();
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final key = _popularListCachePrefix + type;
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await prefs.remove(key);
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await prefs.remove('${key}_timestamp');
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}
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/// 清除所有排行榜缓存
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Future<void> clearAllPopularCache() async {
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final prefs = await SharedPreferences.getInstance();
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final keys = prefs.getKeys();
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for (final key in keys) {
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if (key.startsWith(_popularListCachePrefix)) {
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await prefs.remove(key);
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}
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}
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}
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}
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