[TYPO3-core] RFC: Real Time Caching

[Christian Jul Jensen]

Problem:
TYPO3s caching mechanism doesn't take start and stop time into account. It is 
possible to configure the cache to clear at midnight, but this only solves 
the problem if date and not datetime is used for start and stop times.

Ie. if you want to make a press release aviable at exactly 6.30, it is 
currently not possible, unless you manually clear the cache.

Solution:
Since start and stop of elements are implemented ond DB-level, there is no way 
to know if a content element should appear on the current page within the 
timespan untill the expiration of the cache. So what I've done is to 
pregenerate all the content with a fake time-stamp of the configured cache 
expiration, and look if any of the content elements have a start of stop time 
that is within the timespan.

It seems to work pretty well, but since there is an extra page-generation, I 
made it configurable (but didn't add it to the install-tool).

Obviously the patch cannot take into account content coming from plugins etc. 
unless the tables are configured in TCA and rendered through cObj which often 
doesnt make sense because there is more logic involved, but it is possible to 
call the method of TSFE directly from an extension and thereby making it 
supported by extensions.

Note: The patch is against 4.0.4, but I will make a patch against 4.1 as soon 
as I have the time (in 2009, I guess :D)

ciao
-julle

-- 
Christian Jul Jensen

Gimme five!
http://TYPO3.org/gimmefive/

TYPO3 Core developer 
http://TYPO3.org

TYPO3 Association active member.
http://association.TYPO3.org
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