它不适合追求 App 美观度的 C 端用户，但对需要快速验证控制逻辑、调试传感器耦合性、或构建私有协议网关的嵌入式工程师来说，是比任何现成 SDK 更透明的“控制原语”训练场。

2.2 典型性能瓶颈场景 数据库查询阻塞 ： @Service public class OrderService { public List<Order> getRecentOrders (Long userId) { // 假设该查询耗时300ms return orderRepository.findByUserId (userId); } } 此时线程300ms内无法响应其他请求。

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