NewLruCache new a appoint capacity SimpleLru @param capacity lru cache capacity @return *SimpleLru simple lru.

NewLruElement NewLruElement by value @param v value @return *QueueElem.

NewLruQueue new a appoint capacity NewLruQueue @param cap capacity @return *LruQueue lruQueue.

SimpleLru type SimpleLru.

QueueListener @Description: QueueListener .