Hello to all,
in short:
I have a ConcurrentModificationException caused by the fact that (only)
firefox send out from 2 to 5 request for the same image (generated)
file. I've said only since, I tested it in konqueror and Opera and both
send out only 1 request as httptracer
(http://simile.mit.edu/dist/httptracer) shows out in the log (stripped
down for readability) I've put here
(http://alpha.javanet.info/pub/crossection-firefox.httptrace look also
for opera trace).
I tried setting the ExpiresCachingProcessingPipeline but I had no change
in the result headers. I placed in the same alpha.javanet.info/pub/ dir
the snippet of sitemap I'm using and the action used to generate the image.
How do you guys deal with this? It's the cache approach the right one?
I wasn't able to find much around in ml or docs about this
ExpiresCaching or this specific problem...
Some background info:
The pipeline that generate the simple image I want to serve is made with
java2D taking some data out of OpenOffice spreadsheet using the UNO API.
This requires time (1/2 sec) and happens through an action (impl.
ThreadSafe) that pass a FileSource OutputStream to a dispatcher that is
responsible to interact with the backend and generate the image writing
out a file being <map:read src="{uri}" mime-type="image/png"/> at the end.
I know this isn't the best approach and would be nice to not having to
write out the file at all and just send to the request OutputStream. How
should I do it? Anyway the file should be cacheable isn't it?
If I can't find a solution using ExpiresCachingProcessingPipeline I'll
have to implement some caching mechanism in the action using
SourceValidity before going on in the action, right?
let me know if you need more background info and thanks in advance.
ciao
Eli
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