The on-change auto-sync now syncs only the modified library, and does so
quite efficiently (and should be able to be made more efficient), so we
might be able to reduce the timeout below 15 seconds.
Instead of getting batches of unused primary key ids, even if they're lower
than other ids, which for some reason seemed like a good idea in 2008, just do
a `MAX()` on the table at startup and return the next available id on each call
to `Zotero.ID.get()`. This is much simpler, and not reusing ids allows them to
be used as a chronological sort field.
While SQLite's `SELECT last_insert_rowid()` could return auto-increment values,
it's unsafe with async DB access, since a second `INSERT` can come in before
the first `last_insert_rowid()` is called. This is true even in a transaction
unless a function that calls it is never called in parallel (e.g., with
`Zotero.Promise.all()`, which can be faster than sequential `yield`s).
Note that the next id is always initialized as MAX() + 1, so if an object is
added and then deleted, after a restart the same id will be given. (This is
equivalent to (though unrelated to) SQLite's `INTEGER PRIMARY KEY` behavior,
as opposed to its `INTEGER PRIMARY KEY AUTOINCREMENT` behavior.)
Closes#993, Feed items out of order
Previously, objects were first downloaded and saved to the sync cache,
which was then processed separately to create/update local objects. This
meant that a server bug could result in invalid data in the sync cache
that would never be processed. Now, objects are saved as they're
downloaded and only added to the sync cache after being successfully
saved. The keys of objects that fail are added to a queue, and those
objects are refetched and retried on a backoff schedule or when a new
client version is installed (in case of a client bug or a client with
outdated data model support).
An alternative would be to save to the sync cache first and evict
objects that fail and add them to the queue, but that requires more
complicated logic, and it probably makes more sense just to buffer a few
downloads ahead so that processing is never waiting for downloads to
finish.
- Hide notes, tags and related for feed items in itembox
- Add feed support for <enclosure> elements
- Add feed syncing methods for synced settings (additional work is
needed on the sync architecture to download synced settings from the
server)
- Change feed item clear policy to be less aggressive
- Adjust for deasyncification
- Disable translate-on-select
- Closeadomasven/zotero#7, Remove context menu items from feeds
