On Mar 29, 2011, at 7:17 AM, Hans wrote:
Sorry but there were too many typos Here is a corrected verion
I need a progress indicator that shows the progress of a parser that
also writes the progress state to a db. I have several other examples
of the need
of informing the users of progress of processes that takes some time.
I will not put the parser in a background process, as I think there
should be a more simple solution, considering all the code that needs
a background process for this solution to work i my situation with
many progress indicators
Could one use a remote ajax call to start the e.g the parser and then
call an Ajax function
at the onBefore call back, that asks the server about the progress as
defined in the db
This should work, although you're possibly going to hit some problems
with server time-out on that initial request. All browsers will give
you 2 request threads at a time, some will give you more than that. So
you'd be filling your pipe with the one long-running one and the
second intermittent "polling" call. If your parsing operation can be
broken into multiple, shorter requests, then that would be the avenue
I would pursue first. Otherwise, you stand to hit some very difficult-
to-diagnose problems going down this route.
As far as how to gauge progress, what sort of data are you storing,
and can you do something lightweight like get a count of the number of
rows when you start, estimate how many rows you will add, and then do
a quick count at each status update request?
Walter
Is this a possible approach?
If so what Ajax function should be used to ask the server db about
progress?
Are there other better solutions?
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