#7254: [with patch; needs review] sagenb notebook: automatic worksheet
refreshing
and synchronization
---------------------------+------------------------------------------------
Reporter: was | Owner: boothby
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.2
Component: notebook | Keywords:
Work_issues: | Author:
Reviewer: | Merged:
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Comment(by schilly):
Replying to [comment:5 was]:
> Good question. I think what will happen is that if you do something,
say insert a cell, evaluate a cell, change a cell, and that entire
transaction gets dropped, then a refresh will end up being forced. You
will (1) loose that change, and (2) see that it didn't take. This is
probably much better than thinking that you made that change but actually
not making it.
Well, that could also happen, probably. What I was thinking about is a
flaky connection (or one, where a roundtrip takes longer than 2 secs).
Then, the async request is still open, but already some others waiting to
get dispatched. The number of requests is limited (FF 6, IE 8 in dial up
mode only 2, older browsers also only 2) and therefore all the new
requests timeout eventhough the network might be ok. What i propose is a
boolean request_state_flag that is set to true when the request is made
and set to false, when the async callback 'refresh_cell_list_callback' is
in success or in timeout/fail. Then, the request should only be made if
the flag is false and it never happens that many simultaneous requests jam
the network.
I just don't know all the details and what's already done by the async
requests, so that's just a very rough description what i'm thinking about.
Reverting valid new content to an older version just because of bad timing
with the server might be another issue. Updates from the client to the
server must have higher priority.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7254#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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