About Creating a class for Application Log.

Hello Guys,

I am looking for the concept to Create a global class and methods so that I can Trace any Tcode Step by Step , every time when that particular customized T-code is executed .

it should give all the Information regarding when we pass that traces to the application log.

In that if any method is call it will display all the information regarding that method call like

what is import parameter and export parameter.

same for the user command what is happening with that user command.

Can anyone suggest me...

I have no idea from where to start.