FileMarkId 类

实例化一个文件标记对象，需要传入日志信息和文件名
To instantiate a file tag object, you need to pass in log information and file name

当前的对象最后一次活跃的时间
Last active time of the current object

当前的对象创建的时间
Current object creation time

当前的文件的读取次数，通常也是下载次数。
The current number of reads of the file, usually also the number of downloads.

新增一个对当前的文件的操作，如果没有读取，就直接执行，如果有读取，就等待读取完成的时候执行。
Add an operation on the current file. If there is no read, it will be executed directly. If there is a read, it will be executed when the read is completed.

获取该对象是否能被清除
Gets whether the object can be cleared

进入文件的读取状态
Enter the read state of the file

Determines whether the specified object is equal to the current object.

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.

Serves as the default hash function.

Gets the Type of the current instance.

离开本次的文件读取状态，如果没有任何的客户端在读取了，就执行缓存队列里的操作信息。
Leaving the current file reading status, if no client is reading, the operation information in the cache queue is executed.

Creates a shallow copy of the current Object.

Returns a string that represents the current object.

获取当前对象的JSON格式表示的字符串。
Gets the string represented by the JSON format of the current object.