[dokuwiki] Re: Remove a page from the cache


On 24 Nov 2009, at 18:02, Myron Turner wrote:

Christopher Smith wrote:

Note. I wouldn't consider using p_set_metadata to expire the cache of the current page, you could have concurrency issues. If you change the metadata before dokuwiki checks for cache validity, you'll be fine. If you change it afterwards, its too late.
- Chris


Just want to get this straight.  According to the document

 http://www.dokuwiki.org/devel:caching#individual_page_cache_expiry

p_set_metadata can be used to expire the cache. But what I take from the above is that this should be done in a BEFORE handler to PARSER_CACHE_USE? That is, change the meta file before dokuwiki makes it check.


Strictly yes.  But why would you?

You have the cache object, you can delete the cached data [ $event- >data->removeCache(); ] You have direct access to the dependency array, you can set the 'purge' key to true [ $event->data->depends['purge'] = true; ] You can handle the AFTER advise and control the return value - whether or not DokuWiki should consider the cache object valid [ $event- >result=false; ]

- Chris

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