Hi.
On 15.10.2009 11:42 Ernesto Baschny [cron IT] wrote:
>
> in the new caching framework (starting with 4.3), tt_news could "tag"
> his single views with certain key e.g. (tt_news:<uid>) and then hook
> into the processdatamap of TCEmain to delete these cache entries when a
> tt_news record is modified.
>
I just read through the classes t3lib_TCEmain and tslib_fe and the
caching framework interface. This is the result of my exploration:
1) When using the caching framework, tslib_fe also supports reg1. The
reg1 value (integer) is used as a tag of the cache entry.
For example this can be used by
$GLOBALS['TSFE']->page_cache_reg1 = $this->piVars['tt_news']; // Example
GETvar: &tx_ttnews[tt_news]=123
Without caching framework:
field reg1=123 in table cache_pages
With caching framework:
cache entry has tag: reg1_123
This preserves backward compatibility.
2) When using the caching framework, tslib_fe allows to add tags to
$this->pageCacheTags by using $this->addCacheTags(array $tags)
That means one can use
$GLOBALS['TSFE']->addCacheTags(array('tx_ttnews_' .
$this->piVars['tt_news']); // Example GETvar: &tx_ttnews[tt_news]=123
The result is an additional tag in the cache entry: tx_ttnews_123
3) The t3lib_TCEmain API does not (yet) support clearing cache entries
by tag. But it could be enhanced with a function clear_cache_by_tags()
public function clear_cache_by_tags(array $tags=array()) {
if (TYPO3_UseCachingFramework) {
$pageCache = $GLOBALS['typo3CacheManager']->getCache(
'cache_pages'
);
$pageSectionCache = $GLOBALS['typo3CacheManager']->getCache(
'cache_pagesection'
);
$pageCache->flushByTags($tags);
$pageSectionCache->flushByTags($tags);
}
}
}
4) Hooking into processdatamap could then call clear_cache_by_tags() to
flush the appropriate cache entries.
What do you think?
--
cheers,
Steffen
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