There is another idiom to consider if you need to involve a side effect like notification. See http://clojure.org/reference/agents. You use a ref instead of an atom, you modify the ref and trigger the notification (by sending a function to an agent) inside a transaction, and the agent runs the function (which notifies someone) asynchronously and only if the transaction commits. That technique reconciles the STM system's need to sometimes run transactions more than once until they commit, with the desire to perform side effects only once.
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