不过计算目录大小是个很慢的工作,尤其时文件夹嵌套很深,小文件又很多的时候,缓存一下是很必要的,当新文件上传或者删除设置个 dirty 标记,dirty 标记存在的时候再去重新获取。
The ruby industry is very lucrative [5] but it is far more complex than many ore industries such as iron, silver, or gold because the values of ruby do not depend only on weight or purity. The value depends on a much more complex quality, with grading systems including many artistic, ...