The web page on the internal design of Jigsaw mainly focusses on "resources", "frames" and "filters". The FileResource class represents traditional harddisk files. I concluded that one of these resource classes (perhaps the FileResource class) could be easily identified as representing exactly what is meant by "document" in the MIB description.

I grep'ed through all major classes finding more than 2000 references to Resource and only a hundred to FileResource. Among these hundred were CgiFrame, HTTPFrame and some servlet classes.

In the class httpdStatistics I found the method updateStatistics(). It seemed logical that my own code had to be invoked in the same cases. So I started my search function again this time grep'ing for updateStatistics.

The httpd class was the only resulting candidate. It notifies every access to a document to the statistics object. Its parameters include the request and the generated response. Both objects are derived from HttpMessage and provide a useful interface that keeps you from actually having to deal with resources and frames.