Re: [Makumba-user] [ITD] page caching

[Joao O. <joao.oliveira@BEST.eu.org>]

hey guys,

	I just wanted to tell you that this was my lucky day, I was really 
really happy when Egbert came to me in ICQ and asked showed me this class.

	Suddenly I remember this old task, that risto has been pushing me for 
long :( (http://private.best.eu.org/tasks/task.jsp?task=bz91v4y), and 
immediately I tried to test this class.
	I might say that code is *super hyper* shorter now, so clean that it 
really made me happy :)

	The examples speak for itself, go and check:
http://tequila.best.eu.org/joao-k/johnny/applicationStatistics.jspx
http://tequila.best.eu.org/joao-k/johnny/applicationStatistics.jspx

	I think that soon this can hit production if no1 else has anything 
against it.

	cheers and a merry christmas to all the nerds out there :)



Egbert Teeselink wrote:
> #mak-user in cc.
> 
> hi ITD!
> 
> I made a class for caching pages. The idea of it that pages that don't 
> depend on which user is logged in, on the weather, or on the exact time 
> might not need to be recomputed every time it is accessed. If the exact 
> same information is sent to everybody requesting a page, why not save 
> the page itself instead of computing it with lots of mak:values and db 
> accesses every time? So, in short, this is a method of optimisation.
> 
> The class saves a different page for every different query string that a 
> page gets passed. This allows you to put caches on pages even if they 
> might display different information in different cases.
> 
> I tried it make it as easy to use for JSP authors as possible, and made 
> some documentation inside the class file. If you're interested, please 
> check out 
> http://tequila.best.eu.org/egbert-k/classes/org.eu.best.util.PageCache 
> and give me some comments or whatever.
> 
> I started making it (jsp-based at first) for pages that allow local 
> webmasters to import information like the BAS event list into their 
> websites automatically, and figured that that could easily lead to a 
> very heavy server load. But then, after some feedback from Rudi, we 
> figured it might be more widely applicable. So here :-)
> 
> Joao already expressed an interest in it for a task of his, so maybe 
> it's a good idea to already put it into production quite soon, even if I 
> haven't finished the local webmaster tools thingy yet. So, feedback 
> please :)
> 
> One thing that I see that could maybe become a problem is that the 
> cached pages are saved inside the server's memory. The event list page 
> is easily 30kb, and for multiple different query strings that page would 
> be saved multiple times. If we start doing this thing a lot, we might 
> get into quite some megabytes. Does some server guru know whether this 
> would make a problem? Or is it swapped automatically? Or something?
> 
> -egbert
> 
> ps. a page that works with it is 
> http://tequila.best.eu.org/egbert-k/www/localWeb/eventList.jsp - try 
> reloading the context, and you'll find a <!--computed.--> comment on top 
> of that page. Reload the page itself only, and the <!--computed.--> 
> comment is gone. Note that the page itself is an outdated and 
> work-in-progress thing, please don't look at the content of it :-)
> 
> 

-- 
Joao