Re: Blocking long response in 5.2.4
Re: Blocking long response in 5.2.4
- Subject: Re: Blocking long response in 5.2.4
- From: Thomas <email@hidden>
- Date: Thu, 12 May 2005 17:25:25 +1000
As always, writing the message sparked some ideas, and I've worked it
out.
One thing I didn't notice is that the calculation thread was using
some EOs that were passed to it, and was fetching some related EOs--
from the editing context of the original page.
Just to test this, I fetch the same objects from the thread's EC
(using the primary key) and that solves the problem, but it's slower.
I vaguely recall that you can move an object to a new EC without
refetching it from the database, but I can't find it in the docs.
Could some kind soul please remind me?
And one last question, probably rhetorical-- why did it work all
these years, and stop working in 5.2.4?
Thomas
On 12/05/2005, at 16:32, Thomas wrote:
For many years I have had a number of computationally-intensive
calculations performed in a separate thread using a modified
version of WOLongResponsePage. The pages reloaded every 10 seconds,
sometimes for hours, and happily served up the final result.
Now in WO 5.2.4, the responses stop after a small but apparently
random number of reloads. The calculation thread keeps running, but
the application no longer responds to HTTP requests, even after the
calculation is finished and the thread deleted.
I thought it might be an editing context lock issue, but I've tried
using a new EC for the thread, with no change.
One clue is that it would never even serve the first long response
status page, until I added a one-second sleep near the start of the
calculation thread, which gave the application time to serve the
first page. After that it sometimes serves a few refreshes then
gets stuck.
Of course Apple's Long Response example works fine, even when I
move the code into my application, but it does nothing with EO
objects.
I had an idea it might be the communication between the thread and
the page (updating the status), but even with that disabled, the
same thing occurs.
Any ideas would be greatly appreciated.
Thomas
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