I've been looking at using the clojure.set functions to create a
simple in-memory database cache. Basically when the app boost up, load
entire db into memory, work with it through the basic relational
algebra functions provided. Any mutations (create/update/delete) would
be wrapped in a simple function that 1) updates the cache and 2)
persists to the database in order to add the "D" to STM's "ACI". So
for example, you could have:
(defn insert-product [product]
(dosync (alter products conj product))
(with-connection db (transaction (insert-values XXXstuff hereXXX)))
The dosync will run the alter within an STM transaction.
The transaction will run the insert within a local resource (database)
transaction.
In Java, if you have two transactional systems, you can bridge them
with JTA. STM, however, is a different beast. Has anyone done anything
towards bridging STM and resource transactions?
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