log4j2 CustomAppender to rename the completed file and to append some data string

Question

As I've asked on an another topic

• Lets name the currently written file: current, and to the completed one: previous. The current is "logs/app-%d{MM-dd-yyyy}.log" i.e. "logs/app-09-18-2017.log". The previous is "logs/app-Completed235015-09-18-2017.log". The "Completed_235015" means that the file definitely was completed on this certain time: 23:50:15. Is it possible to configure ? Or perhaps create a plugin and to implement it in Java, though I'm not sure how to do it ... :)

I'm trying to do achieve something not quite standard from the log4j2 capabilities while using the RollingFile and TimeBasedTriggeringPolicy options.

After completion of the currently written file and before a new one is created, I would like to insert the Completed_HHmmss timestamp to the completed filename and append to it the following file's description. Since these actions may require some Java code activation, I suppose that a CustomAppender will be required.

Thanks

Answer 1

Perhaps a following solution could be implemented:

While the current file is updated, a regular RollingFileAppender is used, and upon the completion some CustomAppender will be activated. This CustomAppender will insert the Completed_MMddyyyy string into the file's name and will append the subsequent file's description to the completed file.

Is it feasible ? How should I define and implement such a CustomAppender ?

Thanks