APEX

I am trying to track to the user traffic details ( application traffic analytics [ex: google analytics] ) for the apex application.

Idea behind tracking users is

basic :

1. Display how many users visit this application.
2. Each user - how much time worked on the application
3. Tracking of login - logout timings.

advanced :

1. Most viewed pages in the application.
2. Graphical representation of all the reports.

For this task i am looking for the help how can i track the user session in apex application for the above ideas to implement.

Any helpful link, application , ready codes, please post the urls ....

Thanks in advance.

....