let lruMap = new Map()
let len = 60

export const setLruCache = async (key, value) => {
    try {
      if (lruMap.has(key)) {
        lruMap.delete(key)
      }
      lruMap.set(key, value);
      // 如果超出了容量，则需要删除最久的数据
      if (lruMap.size > len) {
        const delKey = lruMap.keys().next().value;
        lruMap.delete(delKey);
      }
    } catch (error) {
      return ''
    }
}

export const getLruCache = (key) => {
    try {
      if (!lruMap.has(key)) {
        return null;
      }
      const value = lruMap.get(key);  // 获取元素
      lruMap.delete(key);             // 删除元素
      lruMap.set(key, value);         // 重新插入元素
      return value
    } catch (error) {
      return ''
    }
}