Spring Cache 多租户缓存隔离解决方案实践

@Component("tenantCacheResolver")
public class GenericTenantCacheResolver implements CacheResolver {
    
    @Autowired
    private CacheManager cacheManager;
    
    @Override
    public Collection<? extends Cache> resolveCaches(CacheOperationInvocationContext<?> context) {
        // 从方法注解中获取缓存名称模板
        String cacheNameTemplate = getCacheNameTemplate(context);
        
        // 获取当前租户ID
        String tenantId = getCurrentTenantId();
        String finalCacheName = cacheNameTemplate.replace("{tenant}", 
            tenantId != null ? tenantId : "default");
        
        Cache cache = cacheManager.getCache(finalCacheName);
        return Collections.singletonList(cache);
    }
    
    private String getCacheNameTemplate(CacheOperationInvocationContext<?> context) {
        Cacheable cacheable = context.getMethod().getAnnotation(Cacheable.class);
        if (cacheable != null && cacheable.value().length > 0) {
            return cacheable.value()[0];
        }
        return "default";
    }
    
    private String getCurrentTenantId() {
        // 根据实际项目情况获取租户ID
        // 可能是从 SecurityContext、ThreadLocal 或其他上下文获取
        return TenantContext.getCurrentTenantId();
    }
}

@Service
public class BudgetItemsService {
    
    @Cacheable(cacheResolver = "tenantCacheResolver", 
               value = "budgetItems:list:{tenant}", 
               key = "#itemName ?: 'default'", 
               unless = "#result.isEmpty()")
    public List<BudgetItems> getList(String itemName) {
        // 业务逻辑
        return budgetItemsMapper.selectList(wrapper);
    }
    
    @Cacheable(cacheResolver = "tenantCacheResolver", 
               value = "user:info:{tenant}", 
               key = "#userId", 
               unless = "#result == null")
    public User getUserInfo(Long userId) {
        // 业务逻辑
        return userMapper.selectById(userId);
    }
}

@Component("tenantCacheResolver")
public class AdvancedTenantCacheResolver implements CacheResolver {
    
    @Autowired
    private CacheManager cacheManager;
    
    @Override
    public Collection<? extends Cache> resolveCaches(CacheOperationInvocationContext<?> context) {
        String tenantId = getCurrentTenantId();
        String tenantSuffix = tenantId != null ? tenantId : "default";
        
        List<Cache> caches = new ArrayList<>();
        String[] cacheNames = getCacheNames(context);
        
        for (String cacheName : cacheNames) {
            String finalCacheName = cacheName.replace("{tenant}", tenantSuffix);
            Cache cache = cacheManager.getCache(finalCacheName);
            if (cache != null) {
                caches.add(cache);
            }
        }
        
        return caches;
    }
    
    private String[] getCacheNames(CacheOperationInvocationContext<?> context) {
        Cacheable cacheable = context.getMethod().getAnnotation(Cacheable.class);
        if (cacheable != null) {
            return cacheable.value();
        }
        return new String[]{"default"};
    }
    
    private String getCurrentTenantId() {
        // 实际实现根据项目情况而定
        return SecurityUtils.getTenantId();
    }
}