Remote Procedure Call (RPC)

https://github.com/apache/incubator-brpc/blob/master/community/cases.md

针对这个文件，提交PR，然后找我review即可。

更新过程：

1. 开一个issue，名字不妨为“xxx公司的brpc落地场景“
2. 修改这个文件（cases.md)
3. 提交PR

The MinSendBackupAfterMs is now set to 1 ms. Unfortunately this causes backup requests to be send when there is low load. It would be useful if we could set the minimum a little bit higher for certain endpoints.

We hope mores developers join CloudWeGo. This is a task issue which need your help.

Issue Description
Write a business demo code use Kitex, which can guide users how to use Kitex.
Please submit your code to https://github.com/cloudwego/kitex-examples/bizdemo/{yourdemo}.

Picked

• TODO by @longlihale
• TODO by @L0uisJ0shua

Users need a shutdown hook to close a server. The pattern is fairly often used in the Armeria examples.
https://github.com/line/armeria/blob/10f1d3c1e5d3cac6402bc7d1dc9f8d86a96e5857/examples/static-files/src/main/java/example/armeria/server/files/Main.java#L20-L23
We can add a shortcut method for automatically closing a server or a client.

server.closeOnShutDown()
server.closeOnShutDo