Use LFU cache strategy in dubbo #5130
Description
- I have searched the issues of this repository and believe that this is not a duplicate.
- I have checked the FAQ of this repository and believe that this is not a duplicate.
Environment
- Dubbo version: 2.7.4-SNAPSHOT
- Operating System version: macOS 10.14.5
- Java version: 1.8.0_172
Steps to reproduce this issue
I see there is LRU cache implement in dubbo, and LFU is also a useful cache strategy. So, if it's necessary to impl LFU, I will try my best to work on it.