Re: Cache/Agent unification

[prj@po.cwru.edu (Paul Jarc)]

Simon Josefsson <jas@extundo.com> writes:
> All this assumes backends never re-use article numbers, of course.
> I think we could introduce a uidvalidity-like concept in the cache
> system fairly easily, if some backends wants to renumber articles.

Or, if the backand interface overhaul ever happens, we could let
backends identify articles by arbitrary opaque-to-Gnus Lisp forms.
Gnus could still use numbers internally, if that's convenient, but the
cache/agent stuff would have to use the forms from the backends for
persistent identification.

> OTOH backends that renumber articles are hard to cache in any useful
> way so maybe we shouldn't bother.

Well, nnimap is hard to cache, because there is no permanent
identification of an article.  But for nnmaildir, there is.


paul