How to monitor user activity like file upload, task creation etc...?

I need to know when a user created briefcase folder, file uploaded or task/appointment created (any SOAP requests).
Then I need to insert the event into mysql.

At the moment I'm thinking of trace.log monitoring and parsing. But I don't like this approach very much.

I hope there is server API which would allow me to run java daemon on my server and to listen for mentioned events.

Another way I'm thinking of is catching events on client side via zimbra ajax tk API and to send it to backend then.

Please advise.

Thank you in advance!