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Describe what this PR does / why we need it
添加令牌桶乐观锁模式
Does this pull request fix one issue?
NO
Describe how you did it
尝试另一种“准确的”tokenBucket,使用CAS方式更新currentTokenNum及nextProduceTime,解决并发问题.
Describe how to verify it
单元测试及性能测试
Special notes for reviews
1.无锁方式逻辑是否正确
2.性能较有所会有提升么
3.如何更准确的测试