Randall,

That's right - this is completely an off-heap memory store.  I couldn't decide on making it a generic mapdb store vs just an offheap store ;)  I went w/ the former because it's easier.

That being said, I think it'll be trivial to change the code to use persistence.  It would be interesting to see the performance differences.


On Tue, Sep 3, 2013 at 9:36 AM, Randall Hauch <rhauch@redhat.com> wrote:
Looks good. Perhaps I'm missing something, but I don't see a way to persist to local disk with your cache store. Is that right? I see the advantage of having an off heap memory-based cache store, but your code is actually not too far away from a cache store that persists to a (memory-mapped) file. I'd love to see how that compares to a cache store based upon LevelDB. 

On Sep 3, 2013, at 10:55 AM, Ray Tsang <saturnism@gmail.com> wrote:

Good timing - I just started an off-heap store for fun that uses mapdb direct memory db.

Please take a look!


On Tue, Sep 3, 2013 at 6:13 AM, Randall Hauch <rhauch@redhat.com> wrote:
Has anyone looked at writing a cache store that uses MapDB? It provides Maps, Sets and Queues backed by disk storage or off-heap memory, with MVCC and (non-JTA) transactions. The author previously wrote JDBM (multiple versions), and has recently ventured out on his own to focus on MapDB full-time. It's only at 0.9.5, but progressing quite nicely. I've been looking at it for other uses, and quite enjoy it.

        http://mapdb.org
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