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From "Carsten Ziegeler" <cziege...@s-und-n.de>
Subject RE: VERY odd exceptions...
Date Wed, 26 May 2004 07:44:05 GMT
Sylvain Wallez wrote:
> 
> Spotted the problems, which are actually twofold in the TreeProcessor:
> - sitemap modification date is checked to be before or equal 
> to the date when the treeprocessor was built, meaning 
> continuous rebuild if the sitemap date is in the future
> - treeprocessor disposal (and hence its component manager) 
> occurs as soon as change is detected, even if some other 
> request (either in another thread or through a "cocoon:") 
> currently use that treeprocessor, leading to the 
> IllegalStateExceptions
> 
> The first problem is easy to solve, but the second one is 
> more tricky. 
> My current thinking about it is to add a concurrent requests 
> counter and disposal flag. When a sitemap change is detected 
> the flag is set to true. The treeprocessor will be disposed 
> if the disposal flag is true _and_ the concurrent requests 
> counter is zero.
> 
I think we have the second problem in Cocoon since our first version :(
I always thought about adding a counter for the concurrent requests
in a tree processor, but always forget about it :( Regarding
performance: is this a problem as the counter has to be synchronized?

Carsten


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