LinkCache.doc (MediaWiki) - Revision history

Woozle: navbar template

2005-12-07T16:00:01Z

navbar template

← Older revision		Revision as of 16:00, 7 December 2005
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	~~[[Techniques]]: Software: [[MediaWiki]]: [[MediaWikiDoc:Developer Documents\|Developer Documents]]: [[MediaWikiDoc:LinkCache.~~doc\|LinkCache.doc]]		{{mediawiki dev doc\|LinkCache.doc}}
	==Contents==		==Contents==
	The LinkCache class maintains a list of article titles and the information about whether or not the article exists in the database. This is used to mark up links when displaying a page. If the same link appears more than once on any page, then it only has to be looked up once.		The LinkCache class maintains a list of article titles and the information about whether or not the article exists in the database. This is used to mark up links when displaying a page. If the same link appears more than once on any page, then it only has to be looked up once.

Woozle: MediaWikiDoc:LinkCache.doc moved to LinkCache.doc (MediaWiki)

2005-12-07T15:15:31Z

MediaWikiDoc:LinkCache.doc moved to LinkCache.doc (MediaWiki)

← Older revision	Revision as of 15:15, 7 December 2005
(No difference)

Woozle: belated post-import cleanup

2005-12-02T02:18:15Z

belated post-import cleanup

← Older revision		Revision as of 02:18, 2 December 2005
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	[[Techniques]]:		[[Techniques]]: Software: [[MediaWiki]]: [[MediaWikiDoc:Developer Documents\|Developer Documents]]: [[MediaWikiDoc:LinkCache.doc\|LinkCache.doc]]
	Software: [[MediaWiki]]: [[MediaWikiDoc:Developer Documents\|Developer
	Documents]]: [[MediaWikiDoc:LinkCache.doc\|LinkCache.doc]]
	==Contents==		==Contents==
	The LinkCache class maintains a list of article titles and the		The LinkCache class maintains a list of article titles and the information about whether or not the article exists in the database. This is used to mark up links when displaying a page. If the same link appears more than once on any page, then it only has to be looked up once.
	information about whether or not the article exists in the database.
	This is used to mark up links when displaying a page. If the same link		In practice, what happens is that the global cache object $wgLinkCache is consulted and updated every time the function getArticleID() from Title is called.
	appears more than once on any page, then it only has to be looked up
	once. In practice, what happens is that the global cache object		This has a side benefit that we take advantage of. We have tables "links" and "brokenlinks" which we use to do things like the Orphans page and Whatlinkshere page. It just so happens that after we update a page, we display it – and as we're displaying it, we look up all the links on that page, causing them to be put into the cache. That information is exactly what we need to update those two tables. So, we do something tricky when we update pages: just after the update and before we display, we clear the cache. Then we display the updated page. Finally, we put a LinksUpdate object onto the deferred updates list, which fetches its information from the cache.
	$wgLinkCache is consulted and updated every time the function
	getArticleID() from Title is called. This has a side benefit that we		There's a minor complication: displaying a page also looks up a few things like the talk page link in the quick bar and the date links. Since we don't want those in the link tables, we must take care to suspend the cache while we look those up. Skin.php does exactly that – see dateLink(), for example.
	take advantage of. We have tables "links" and "brokenlinks" which we		==Edit Log==
	use to do things like the Orphans page and Whatlinkshere page. It just
	so happens that after we update a page, we display it – and
	as we're displaying it, we look up all the links on that page, causing
	them to be put into the cache. That information is exactly what we need
	to update those two tables. So, we do something tricky when we update
	pages: just after the update and before we display, we clear the cache.
	Then we display the updated page. Finally, we put a LinksUpdate object
	onto the deferred updates list, which fetches its information from the
	cache. There's a minor complication: displaying a page also looks up a
	few things like the talk page link in the quick bar and the date links.
	Since we don't want those in the link tables, we must take care to
	suspend the cache while we look those up. Skin.php does exactly that
	– see dateLink(), for example. ==Edit Log==
	*'''2005-06-13''' Transcribed from docs for MediaWiki version 1.4.5		*'''2005-06-13''' Transcribed from docs for MediaWiki version 1.4.5

Woozle at 11:54, 13 June 2005

2005-06-13T11:54:41Z

New page

[[Techniques]]:
Software: [[MediaWiki]]: [[MediaWikiDoc:Developer Documents|Developer
Documents]]: [[MediaWikiDoc:LinkCache.doc|LinkCache.doc]]
==Contents==
The LinkCache class maintains a list of article titles and the
information about whether or not the article exists in the database.
This is used to mark up links when displaying a page. If the same link
appears more than once on any page, then it only has to be looked up
once. In practice, what happens is that the global cache object
$wgLinkCache is consulted and updated every time the function
getArticleID() from Title is called. This has a side benefit that we
take advantage of. We have tables "links" and "brokenlinks" which we
use to do things like the Orphans page and Whatlinkshere page. It just
so happens that after we update a page, we display it – and
as we're displaying it, we look up all the links on that page, causing
them to be put into the cache. That information is exactly what we need
to update those two tables. So, we do something tricky when we update
pages: just after the update and before we display, we clear the cache.
Then we display the updated page. Finally, we put a LinksUpdate object
onto the deferred updates list, which fetches its information from the
cache. There's a minor complication: displaying a page also looks up a
few things like the talk page link in the quick bar and the date links.
Since we don't want those in the link tables, we must take care to
suspend the cache while we look those up. Skin.php does exactly that
– see dateLink(), for example. ==Edit Log==
*'''2005-06-13''' Transcribed from docs for MediaWiki version 1.4.5