Non database transactional objects???

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database

event

My application does have database operations that are wrapped up in traditional transactions, but it also has objects that do other stuff with external systems.

I would like to add to these objects so that they are controlled by the same transaction object used by the database operations. I have the code for these other objects so I can add to them, but they are not at all database related. I would have to put the code in to make them manually undo thier previous actions if asked to do so.

But how do I make them sensitive to the transaction object? Are there events that I hav eto subscribe to? Interfaces that I have to implement?

How does one go about making a transactionally aware non-DB object?