On Tue, Jun 01, 2010 at 10:22:54AM -0400, Paul Natsuo Kishimoto wrote: > Luca's first point is probably the most important. Working offline with > tasks from any online source will only work with some sort of caching. > We could pretend to ourselves that "caching" and a "local backend" are > different things, but that would mostly be a lie :) > > I have user cases to work on this week, and I will mostly focus on > other applications on the desktop, but with your permission Luca I will > include these as well on a wiki page. sure! > > Some thoughts: Any "transforms" of task data should be REVERSIBLE and > BACKEND-AGNOSTIC. By REVERSIBLE I mean that: > Task A (Backend X) -> Task A (Local File) -> Task A (Backend X) > ...should result in an identical object in Backend X. > > Obviously this only applies where Backend X has a *less* sophisticated > task model than GTG—but there are lots of such cases (RTM, iCalendar... > did everyone see my spreadsheet? > http://spreadsheets.google.com/ccc?key=0AhRkDXhnjLt8dHM3MmZ0YmJnMm1UM1hySFNlaDBVc1E&hl=en_GB) > > By BACKEND-AGNOSTIC, I mean that if you have Backend X and Backend Y > that both support the same subset of the GTG data model, then: > Task A (Local File) -> Task A (Backend X) > Task A (Local File) -> Task A (Backend Y) > ...should produce the same result, *unless* there is some very good > reason to do otherwise. > > Or suppose you also have Backend Z, which contains a set of > information that is a superset of what X & Y hold, but still not the > full GTG model. Then: > Task A (Local File) -> Task A (Backend Z) -> Task A (Backend X) > Task A (Local File) -> Task A (Backend Z) -> Task A (Backend Y) > ...should ALSO produce the same result. > > I.e. as the task information degrades or is lost, it degrades in a > similar manner for similar backends. This helps ensure that it is > possible to determine Task A (Backend X) == Task A (Backend Y) == Task A > (Backend Z). > Yes, this is a possible issue. I think a solution to that is to sync always against the tasks loaded from the (default) localfile backend. No direct communication between backends will be possible.
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