I've been reading DB4O's whitepaper (mentionned in Toad's post) and I'm wondering if I could use it for the WoT plugin. I could get rid of Derby and it would make the deployment simpler if db4o is shipped with freenet.
Query possibilities are sufficient to my needs but I've got a few problems : With a RDBM, I can simply do the calculation of scores in the database (with a trigger and stored procedures). With db4o, persistence would be easier but I worry about memory consumption if I have to load every identities in memory each time a trust value is updated. An identity is about 200-250B. You see the problem if we have 1.000.000 identites ! The other problem is how to store the trust values. With derby, I simply have 2 tables, one with identites, the other with the trust values and ids if the truster and the trustee. How can I do that with an OO database ? The only idea I have is : Create a class Trust containing reference to the trusted identity and trust value, and store a list of Trust objects in every identites. I can't figure how bad it would be for the memory consumption. Do you think it is feasible and worth the work ? -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 252 bytes Desc: OpenPGP digital signature URL: <https://emu.freenetproject.org/pipermail/devl/attachments/20080517/648269f7/attachment.pgp>
