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修复可能存在OOM的问题
解决思路是使用LinkedHashMap的removeEldestEntry实现了一个类似于LRUCache的自定义LRUSet类来替代原来的HashSet类,LRUSet设定最大的容量(当前为128),当往set中put新数据超过了最大容量时,会自动删除不常用的记录,每一次contains判断都会激活一次记录,这样能保证在notStaticUri 中的URI都是一些最新的热点记录,又不会因为比如动态URL path导致的无限制增长