Funny, but I will be coming across this same need very soon and, like
Mariano, it would be great to get that information without having to
traverse all the objects. I think the mixin class would be a great
addition. Mariano, if you do give that a try, would you mind sharing
it with the code and hopefully that will make it into future releases?
Thanks
On Oct 2, 2007, at 1:34 PM, Ian Eslick wrote:
> This probably isn't possible for the BDB data store. You can get
the leaf count for a BDB
> Btree, but not for a subtree (we multiplex Elephant BTrees on a
single, large BDB BTree).
It's not that BDB doesn't provide a count, it's that the way we use
their DB doesn't make that count useful. We don't have a 1:1
mapping between lisp persistent-collections and BDB btrees, instead
we have an N:1 lisp btree->BDB btree. I don't have time to go into
all the good reasons why, but the problem is on our end of things.
Ian
On Oct 2, 2007, at 12:46 PM, Mariano Montone wrote:
Perhaps we could provide a mixin class that automatically maintains
this count on the lisp side for a user subclass of persistent-
collection?
Ok. I may try that. It's astonishing for me that the BDB api does
not provide such functionality.
Thanks, Mariano
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