[TYPO3-ttnews] better cache management for tt_news

[Krystian Szymukowicz]

Hi

I hope someone will be interested.

A month ago on 'dev' I wrote a post about idea of better cache 
management for extensions:
http://support.typo3.org/index.php?id=17&tx_nntpreader_pi1[nid]=2&tx_nntpreader_pi1[mid]=333485&cHash=0174821ab9

Today I've just uploaded two extensions - ttnewscache and 
ttnewscache_clearlike.

First extension (ttnewscache) builds an array with information which 
part of tt_news cached views has become not up to date after latest 
tt_news record update/create/delete operation.
Then the array is used by other extension (ttnewscache_clearlike) to 
clear proper cache records.

Hook mechanism allows to use the array information by many extensions. 
So one extension can delete cache_pages, other can remove statically 
generated files if extensions like for example nc_staticfilecache are used.

So how cache is cleared after installing ttnewscache with proper 
clearing ext.?

In short:

1. No more clearing cache for ALL single.

2. No more clearing cache for views that can not hold the news. 
Extension checks if views match the news categories. If not then cache 
are not cleared.

3. Extension checks for changes that have NO impact on cache. For 
example: the hidden news was created, the hidden news was updated, the 
hidden news was deleted.

4. Extension checks what field have been modified. There are fields 
which clear all cached pages of view but there are also fields that 
clear only selected pages (see manual for better explanation). Each type 
of view (LIST,LATEST) can have its own "clearing" fields and each view 
can override this settings. Check TypoScript Examples in documentation.


More information in manuals.


--
grtz
Krystian