This is actually what the Workflow module does. (I think someone else mentioned it too.) You can create:

• Actions to move from one state to another (or not change state at all)
• Conditions to see whether the current environment can execute an action (which changes state).
• Validators to check data coming into the system

All of these are simple Perl classes, and because there's a 'context' moving data into and out of the workflow it doesn't care where it's run, and neither do your classes.

I gave a presentation on it a couple months ago to the Pittsburgh Perlmongers that might be helpful, and it comes with working examples, decent docs, some tests, etc.

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