Hi Everyone,
I spoke with chen on IRC this morning and got hinted at a preliminary
implementation of EBookBackendSqliteDB sitting in -ews. Since there
are some benefits of something something like this make it's way to
a common place that could be used by -mapi as well, I thought I'd do
a quick feasability review to see what problems there might be.
Questions/commments/suggestions follow. Please let me know what you
think!
* No backend _get_contact/_get_contacts equivalent. Should be
easily implemented.
* _add_contact/_remove_contact should be renamed to
_add_contacts/_remove_contacts to be consistant with other backend
methods that take lists.
* but also having a _add_contact/_remove_contact that takes just a uid
(similar to other backends) would be useful
* -mapi seems to use one cache per-profile-per-folder, but the sqlitedb
backend takes these as calling parameters. Not really a problem and
I think it may be reasons to have one cache db anyway, so this is
just more of an observation.
* _get/_set/_delete interfaces are needed for cache metadata (last modified,
etc).
* if folder metadata is going to be free-form, it could be better to have
a key->value table ( folder_id_id int, key_name text, value text ) rather
than arbitrarily numbered text/binary fields.
* not sure of this one: given there may be multithreaded access to the db,
do we need to provide any external "big locks" on reads/writes? maybe
the built in sqlite stuff is sufficient.
* not sure of this one: beyond the COMMIT statements, should there be
something to periodically sync the db beyond the backend "finalize" method?
Unsure with commit is sufficient to get consistant on-disk in case of
crash, etc.
* do we need a set_populated/is_populated equivalent? or maybe that could
be solved in the cases it's needed wtih metadata.
* do we need a set_time/get_time equivalent? or maybe that could
be solved in the cases it's needed wtih metadata.
@chen: I don't know how active you plan to be on this, but if you're looking
to offload any work, I can pick up anything that results from the above if
you like. Just let me know!
Sean
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