Cache API

This is a development page for the Cache API that we are currently implementing. Talk to EmuWikiAdmin- for more information.

Manual

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We have a somewhat working version here : http://www.emuwiki.com/testinstall/extensions/CacheAPI_current.txt

Updated : EmuWikiAdmin- 05:57, 1 July 2009 (UTC)

Installing

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For now this SQL command needs to be executed manually before installing :

 CREATE TABLE IF NOT EXISTS `cacheapi` (
`page_ids` INT(10) NOT NULL ,
`dependencies` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,
`first` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL ,
`type` INT(10) NOT NULL ,
INDEX ( `page_ids` , `dependencies`(40) , `first`(40) , `type` )
) ENGINE = MYISAM 

You will also need to add this to DPLMain.php :

		// update dependencies to CacheAPI whenever the page containing the DPL query is edited
		
		if ($wgRequest->getVal('action','view')=='submit') {
			CacheAPI::remDependencies ( $wgArticle->getID()); 
			$categorylist = array();
			foreach ($aIncludeCategories as $categorygroup) {
				foreach ($categorygroup as $category) {
					$catobj = Category::newFromName( $category );
					array_push ( $categorylist , $catobj->getID() );
				}
			}
			CacheAPI::addDependencies ( $wgArticle->getID(), 1, $categorylist, ''); 
		}

Removing dependencies

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To remove all dependencies of a page, use CacheAPI::remDependencies ( $idOfThePage ).

Adding dependencies

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To add a dependency, use CacheAPI::addDependencies ( $pageid , $type, $conditions, );

Type can be :

CACHETYPE_CATEGORY if you want the cache of article $pageid to be dependent on articles being touched in the categories $conditions

CACHETYPE_TEMPLATE if you want the cache of article $pageid to be dependent on articles being touched and containing templates $conditions

CACHETYPE_LINKSTO if you want the cache of article $pageid to be dependent on articles being touched and containing links to page $conditions

$condition is an array of category ids (numbers) or template names (strings).

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TODO :

• Switch from using page names (linksto) and template names (template) to using pages ids and template ids, like we did with categories. If possible.
• Implement other types of dependencies (Namespace, linksfrom, etc...)
• Implement the NOTs (notcategory, notlinksto, etc...)
• Make a better system for deletion of dependencies (right now, the only thing you can do is delete ALL dependencies related to a page at once, this is not good for pages with multiple DPL invocations).
• Implement cache outdating when special events other than edit/create are performed (deletion, rename, etc...)
• If you need anything else, add it here.

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Feedback and discussion moved here.