[Leveldb]源码分析之二 Cache模块的实现
在Leveldb中，用户可以将自定义的Cache逻辑传入Option中，默认使用的是LRU算法实现，下面是实现类图： 其中LRUHandle是存放数据的node LRUCache实现具体的Insert，lookup等操作，而ShardedLRUCache中又实现分片包含多个LRUCache。 HandleTable是自己实现的一
在Leveldb中，用户可以将自定义的Cache逻辑传入Option中，默认使用的是LRU算法实现，，下面是实现类图：
其中LRUHandle是存放数据的node
LRUCache实现具体的Insert，lookup等操作，而ShardedLRUCache中又实现分片包含多个LRUCache。
HandleTable是自己实现的一个HashTable，官方说法是这个实现相较内部实现会有百分之五的提升。
下面是主要操作的流程：
Insert：
1.根据hash结果由ShardedLRUCache选择相应的LRUCache
2.将数据存入HashTable中，若空间不足则相应*2
3.如果是一个已存在的数据那么就根据LRU算法调整存储的位置
Lookup:
1.将key做hash寻找相应的LRUCache
2.在HandleTable中查找是否存在该数据，若存在则调整相应位置
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