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Ron Bodkin has written about Performance monitoring with AspectJ: A look inside the Glassbox Inspector with AspectJ and JMX, which is part of the AOP@Work series.

Say goodbye to scattered and tangled monitoring code, as Ron Bodkin shows you how to combine AspectJ and JMX for a flexible, modular approach to performance monitoring. In this first of two parts, Ron uses source code and ideas from the Glassbox Inspector open source project to help you build a monitoring system that provides correlated information to identify specific problems, but with low enough overhead to be used in production environments.

The article gets into some serious code, and discusses:

• An aspect for capturing time and counts of servlets
• Managing overhead
• Thread safety
• Exposing performance data
• Exposing beans for JMX management
• Database request monitoring
• Servlet request tracking
• JDBC monitoring
• Tracking JDBC information

Not only is this a great example of seeing *real* AOP at work, but it also let's us see the work being done in Glassbox, which wil hopefully end up with us being able to find problems in our software a LOT faster!