It´´s a very iteresting concept.
The Workflow Monad transformer [1], in Control.Workflow perform
logging and recovery of application istate from the log created.
It has no implementation of roll-back or limited recovery upto a
point, but this is easy to implement.
It also has many inspection and synchronization primitives. It has
been used also for translating the log of a program and recovering the
state in another machine. The log can be pretty-printed for
debugging.
[1] http://hackage.haskell.org/package/Workflow
2012/9/30 KC
http://martinfowler.com/eaaDev/EventSourcing.html
http://martinfowler.com/articles/lmax.html
-- -- Regards, KC
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-- Alberto.