Re: jCharts in Struts

Ok. So it sounds like your load is fairly high

avg 5 charts per page * avg 35 pages = 175 charts per pdf.  Caching could make sense here; I do
not know all your performance metrics, like how long it takes to generate charts versus the whole
pdf, versus fetching/computing the plot data, user load, size of box, etc...

I would suggest doing on the fly charts and then run using cached charts to see what the
difference is and how it fits into your overall performance plan.




--- Chris Ward <[email protected]> wrote:

> On Friday 05 November 2004 04:09 am, Chris McKay wrote:
> > Plus you need to write a file collector as well to tidy up the cache
> > directory ...
> >
> > C
> 
> In my case, I don't need to delete a 'cache' folder, as it never grows beyond 
> a set size of images. The image names are reused each time the graphs are 
> created, so that static names can be used on web pages.
> 
> It may not be the case for most people, but I have to generate my data from a 
> database for each chart, and I have from 2 to 8 charts on a page, with my 
> final result being a PDF of 30-40 pages. In my case, I think the cost of 
> generating the graphs is high, with the individual graphs changing 
> infrequently.
> 
> I have used the servlet in an img tag before, and it appears that most people 
> here like that method and recomend it first, but I have always liked the idea 
> of reducing server load to the web server. If you have highly dynamic graphs, 
> I guess you have no choice. I have also contemplated moveing the servlet 
> graph generators to a seperate 'image' server, but decided that still would 
> be best with more dynamic charts than I have. Mine only change when a user 
> changes input data, not with an automatic process such as recording 
> temperature data.
> 
> All things said, if the servlet in an image tag is the preferred method of 
> this list, I don't need to confuse new people by suggesting saving to a file 
> again, but I did put thought into it before making my decision.
> 
> Chris
> 
> 
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