【Enhancement】优化主流程lookProcessChain方法 issue #3513#3514
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LilMosey wants to merge 3 commits intoalibaba:masterfrom
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【Enhancement】优化主流程lookProcessChain方法 issue #3513#3514LilMosey wants to merge 3 commits intoalibaba:masterfrom
LilMosey wants to merge 3 commits intoalibaba:masterfrom
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LilMosey
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Describe what this PR does / why we need it
issue #3513
（详细信息都在issue里）
Does this pull request fix one issue?
issue #3513
Describe how you did it
Describe how to verify it
实现逻辑参照Collections.synchronizedMap()
Special notes for reviews
后续思考：
当资源数限制（如 6000）放开后，或者可以允许超一点点去追求极致的性能的话，代码还可以进行如下优化：
chainMap使用ConcurrentHashMap，不需要显示进行加锁，直接采用ConcurrentHashMap#computeIfAbsent方法，这样锁的粒度更小，性能更好。