Re: OSCache with lots of Tiles fragments

Hi everyone,

First of all, thanx to Hani and Bjorn for their help.

I started using OSCache + Tiles today, and it worked very well in the 
end. But I came across a little problem, I thought some of you might be 
interested by this experience.

If you use a <tiles:insert/> tag, you will get a "Illegal to flush 
within a custom tag" exception from the servlet container.
This is because when you insert a Tiles fragment, the output stream is 
flushed automatically by Tiles. It is forbidden by the JSP spec to nest 
a custom tag that is flushing the output stream, inside another custom tag.

The solution is to use the flush="false" attribute with the 
<tiles:insert/> tag.

I understand this is a Tiles-related problem, but I think this could be 
useful in the FAQ, if you want I can write it and send a patched version.

Julien Dubois.

Hani Suleiman wrote:
> Oops, sent to wrong list. Bad Sunday.
> 
> Begin forwarded message:
> 
>> From: Hani Suleiman <[email protected]>
>> Date: April 4, 2004 4:21:58 PM GMT+01:00
>> To: [email protected]
>> Subject: [Opensymphony-sitemesh] Re: [Opensymphony-oscache] OSCache 
>> with lots of Tiles fragments
>>
>> Yes, as long as your pages end up spitting out content of some sort, 
>> oscache is a perfect fit.
>>
>> OSCache doesn't know about tiles nor does it care, all it'll deal with 
>> is the result of whatever tiles does.
>>
>> It's hard to beat oscache's performance (trust me, it's very very 
>> fast). Of course if people abuse it (eg, Clinton Begin's very bizarre 
>> usage of oscache to cache db entities) then they only have themselves 
>> to blame!
>>
>> While there's no reason oscache wouldn't work for any/all sorts of 
>> caching, that really isn't the primary goal of it. The main purpose is 
>> for web site caching, for it to be as close to the front as possible.
>>
>> What you want to do is very very standard usage for oscache, so almost 
>> everyone who uses it does it for the exact same situation you're in, 
>> so yes, I'd say there are plenty of people who have done what you 
>> intend to. Examples are jroller.com (uses oscache over velocity 
>> templates), and javablogs.com (oscache over sitemesh jsp pages).
>>
>> On Apr 4, 2004, at 4:14 PM, Julien Dubois wrote:
>>
>>> Hi,
>>>
>>> I'm currently investigating OSCache for my next app.
>>> It will have between 3000 and 6000 users, using it all day long (I'd 
>>> say one click every 5 minutes in average).
>>> It will have a main layout, containing about 12 Tiles JSP fragments.
>>> The data for each Tile is very complex, but will not change often.
>>> I plan to cache the whole thing, as I will have about 20 kinds of 
>>> users (so that's 20 entries in my cache), and make it reload every hour.
>>> I'm a bit concerned by a recent entry on Matt Raible's weblog, it 
>>> seems Clinton Begin said OSCache was a dawn slow caching mechanism...
>>> So...
>>> 1. Does anybody have some experience with this kind of architecture?
>>> 2. Does OSCache play well with Tiles?
>>> 3. Is OSCache really under-performant?? For my app, it will not have 
>>> a lot of entries, but it will have lots of requests.
>>>
>>> If I do end up with using OSCache, you will of course see more of me 
>>> on this mailing list. But next time I hope I'll be the one answering 
>>> questions :-)
>>>
>>> Julien Dubois.
>>>
>>>
>>>
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>>
>>
>>
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> 
> 
> 
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