1、支持key-value匹配查询（hash）， 也支持近似值匹配查询（多阶二分查找）
2、支持多块block 或者 多value 异步同时加载
3、支持全局内存最大值设置 或 全局最大block对象设置；
4、支持lru、lfu和随机淘汰算法，同时也支持时间过期淘汰；
5、支持回调： load加载回调、加载成功回调、对象淘汰回调；
6、支持统计key的命中率（hit count 和 miss count）
7、支持多key（interface{}）-value（interface{}）并行加载
1, support key-value matching queries (hash), and also support approximate matching queries (Multi - level two - point lookups)
2, support multi block block or multi value asynchronous simultaneous loading
3 supports global memory maximum settings or global maximum block object settings;
4 supports LRU, LFU, and random elimination algorithms, and also supports time expired elimination;
5, support callbacks: load loads callbacks, loads successful callbacks, objects, and eliminates callbacks;
6, support statistics key hit rate (hit, count, and miss count)
7, support multiple key (interface{}) -value (interface{}) parallel loading