如果选择了文件，则运行定制函数；否则，不进行任何操作。

If a file is selected, then run the custom function; otherwise, do nothing.

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如果所有参与者都准备好提交，则事务提交；否则事务中止提交。

If all participants are prepared to commit, the transaction commits; otherwise, the transaction aborts.

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否则，如果当前状态不匹配已记录的状态，则运行指定的命令。

Otherwise, if the current state does not match the recorded state, run the command specified.

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