如何在指定时间内强制接口返回消息

作为服务端，为了避免影响用户体验，接口要求必须在N ms内返回。
如果不在客户端控制，如何在服务端实现这个能力？

一种方法是，进入工作线程后，定义一个Timer，设置超时时间，开启另个线程执行工作任务，当超时后，主线程cancel掉工作任务，并返回客户端。
还有没有其他的简易实现办法？

The issue names no files, tests, or entry points and asks for a server-side timeout design rather than a specific change. Start by locating ServiceComb's server request-handling and task-execution code, then establish how a timeout should stop or isolate work and what response clients receive when N ms is exceeded; done requires an agreed implementation scope and tests for the timeout behavior.

Written by the indexing model from the issue text.