[Haskell-cafe] Re: [Haskell] ANN: persistent-map-0.0.0

Alberto G. Corona agocorona at gmail.com
Sun Apr 19 18:38:39 EDT 2009

Interesting. It seems similar to TCache. However the design is
different. persistent-map store different finite maps whenever any of
them are  modified transactionally, while TCache handles a single
hashTable of object of type "a" and from time to time store all the
transactionally modified objects and rearange the hashTable size.

2009/4/19 Peter Robinson <thaldyron at gmail.com>:
> The persistent-map package [1] provides a thread-safe (STM) frontend
> for finite map types together with a backend interface for persistent
> storage. The TMap data type is thread-safe, since all access functions
> run inside an STM monad . Any type that is an instance of
> Data.Edison.Assoc.FiniteMapX (see EdisonAPI) can be used as a map
> type.
> If a TMap is modified within an STM transaction, a corresponding
> backend IO-request is added using the onCommit hook (cf. stm-io-hooks
> package). To ensure consistency, the (Adv)STM monad runs these
> requests iff the transaction commits. Additional backends (e.g. HDBC)
> can be added by instantiating class Backend.
> Cheers,
> Peter
> [1] http://hackage.haskell.org/cgi-bin/hackage-scripts/package/persistent-map
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