123 lines
3.4 KiB
Dart
123 lines
3.4 KiB
Dart
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import 'dart:convert';
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/// 离线缓存服务
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/// 基于 Hive 提供本地数据存储能力
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class CacheService {
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static CacheService? _instance;
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final Map<String, dynamic> _memoryCache = {};
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bool _isInitialized = false;
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CacheService._internal();
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factory CacheService() {
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_instance ??= CacheService._internal();
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return _instance!;
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}
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/// 初始化缓存（打开 Hive Box）
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Future<void> initialize() async {
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if (_isInitialized) return;
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try {
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// TODO: 初始化 Hive
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// await Hive.initFlutter();
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// await Hive.openBox(AppConstants.cacheBoxName);
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// await Hive.openBox(AppConstants.userBoxName);
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_isInitialized = true;
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print('[CacheService] 缓存服务已初始化（模拟）');
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} catch (e) {
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print('[CacheService] 初始化失败: $e');
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}
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}
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/// 写入缓存
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Future<void> put(String key, dynamic value, {String box = 'default'}) async {
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try {
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// TODO: 使用 Hive 持久化
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// final cacheBox = Hive.box(AppConstants.cacheBoxName);
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// await cacheBox.put(key, value);
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_memoryCache['$box:$key'] = value;
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} catch (e) {
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print('[CacheService] 写入缓存失败: $e');
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}
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}
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/// 读取缓存
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Future<T?> get<T>(String key, {String box = 'default'}) async {
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try {
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// TODO: 使用 Hive 读取
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// final cacheBox = Hive.box(AppConstants.cacheBoxName);
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// return cacheBox.get(key) as T?;
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return _memoryCache['$box:$key'] as T?;
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} catch (e) {
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print('[CacheService] 读取缓存失败: $e');
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return null;
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}
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}
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/// 删除缓存
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Future<void> delete(String key, {String box = 'default'}) async {
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try {
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_memoryCache.remove('$box:$key');
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} catch (e) {
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print('[CacheService] 删除缓存失败: $e');
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}
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}
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/// 清空指定 Box 的所有缓存
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Future<void> clearBox({String box = 'default'}) async {
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try {
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_memoryCache.removeWhere((key, _) => key.startsWith('$box:'));
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} catch (e) {
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print('[CacheService] 清空缓存失败: $e');
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}
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}
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/// 清空所有缓存
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Future<void> clearAll() async {
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try {
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_memoryCache.clear();
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} catch (e) {
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print('[CacheService] 清空所有缓存失败: $e');
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}
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}
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/// 缓存 JSON 对象
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Future<void> cacheJson(String key, Map<String, dynamic> data, {String box = 'default'}) async {
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await put(key, json.encode(data), box: box);
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}
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/// 读取缓存的 JSON 对象
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Future<Map<String, dynamic>?> getCachedJson(String key, {String box = 'default'}) async {
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final data = await get<String>(key, box: box);
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if (data == null) return null;
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try {
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return json.decode(data) as Map<String, dynamic>;
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} catch (e) {
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return null;
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}
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}
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/// 缓存列表数据
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Future<void> cacheList(String key, List<Map<String, dynamic>> items, {String box = 'default'}) async {
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await put(key, json.encode(items), box: box);
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}
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/// 读取缓存的列表数据
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Future<List<Map<String, dynamic>>?> getCachedList(String key, {String box = 'default'}) async {
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final data = await get<String>(key, box: box);
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if (data == null) return null;
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try {
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final decoded = json.decode(data) as List;
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return decoded.cast<Map<String, dynamic>>();
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} catch (e) {
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return null;
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}
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}
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/// 检查是否有缓存
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Future<bool> has(String key, {String box = 'default'}) async {
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return _memoryCache.containsKey('$box:$key');
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}
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}
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