ProtocolManager class's getCpProtocol()/getApProtocol() method' codes can be optimized.

[zongtanghu]

ProtocolManager class's getCpProtocol()/getApProtocol() method' codes can be optimized.

Issue Description

Type: feature request

Describe what happened (or what feature you want)

Describe what you expected to happen

ProtocolManager class's getCpProtocol()/getApProtocol() method' codes can be optimized.

How to reproduce it (as minimally and precisely as possible)

XXXX

Tell us your environment

all version;

Anything else we need to know?

No;