* @ingroup Cache
*/
class LinkCache {
- /**
- * @var HashBagOStuff
- */
+ /** @var HashBagOStuff */
private $mGoodLinks;
- /**
- * @var HashBagOStuff
- */
+ /** @var HashBagOStuff */
private $mBadLinks;
+ /** @var WANObjectCache */
+ private $wanCache;
+
+ /** @var bool */
private $mForUpdate = false;
- /**
- * @var TitleFormatter
- */
+ /** @var TitleFormatter */
private $titleFormatter;
/**
*/
const MAX_SIZE = 10000;
- public function __construct( TitleFormatter $titleFormatter ) {
+ public function __construct( TitleFormatter $titleFormatter, WANObjectCache $cache ) {
$this->mGoodLinks = new HashBagOStuff( [ 'maxKeys' => self::MAX_SIZE ] );
$this->mBadLinks = new HashBagOStuff( [ 'maxKeys' => self::MAX_SIZE ] );
+ $this->wanCache = $cache;
$this->titleFormatter = $titleFormatter;
}
return 0;
}
- // Some fields heavily used for linking...
- $db = $this->mForUpdate ? wfGetDB( DB_MASTER ) : wfGetDB( DB_REPLICA );
+ // Cache template/file pages as they are less often viewed but heavily used
+ if ( $this->mForUpdate ) {
+ $row = $this->fetchPageRow( wfGetDB( DB_MASTER ), $nt );
+ } elseif ( $this->isCacheable( $nt ) ) {
+ // These pages are often transcluded heavily, so cache them
+ $cache = $this->wanCache;
+ $row = $cache->getWithSetCallback(
+ $cache->makeKey( 'page', $nt->getNamespace(), sha1( $nt->getDBkey() ) ),
+ $cache::TTL_DAY,
+ function ( $curValue, &$ttl, array &$setOpts ) use ( $cache, $nt ) {
+ $dbr = wfGetDB( DB_REPLICA );
+ $setOpts += Database::getCacheSetOptions( $dbr );
- $row = $db->selectRow( 'page', self::getSelectFields(),
- [ 'page_namespace' => $nt->getNamespace(), 'page_title' => $nt->getDBkey() ],
- __METHOD__
- );
+ $row = $this->fetchPageRow( $dbr, $nt );
+ $mtime = $row ? wfTimestamp( TS_UNIX, $row->page_touched ) : false;
+ $ttl = $cache->adaptiveTTL( $mtime, $ttl );
- if ( $row !== false ) {
+ return $row;
+ }
+ );
+ } else {
+ $row = $this->fetchPageRow( wfGetDB( DB_REPLICA ), $nt );
+ }
+
+ if ( $row ) {
$this->addGoodLinkObjFromRow( $nt, $row );
$id = intval( $row->page_id );
} else {
return $id;
}
+ private function isCacheable( LinkTarget $title ) {
+ return ( $title->inNamespace( NS_TEMPLATE ) || $title->inNamespace( NS_FILE ) );
+ }
+
+ private function fetchPageRow( IDatabase $db, LinkTarget $nt ) {
+ $fields = self::getSelectFields();
+ if ( $this->isCacheable( $nt ) ) {
+ $fields[] = 'page_touched';
+ }
+
+ return $db->selectRow(
+ 'page',
+ $fields,
+ [ 'page_namespace' => $nt->getNamespace(), 'page_title' => $nt->getDBkey() ],
+ __METHOD__
+ );
+ }
+
+ /**
+ * Purge the link cache for a title
+ *
+ * @param LinkTarget $title
+ * @since 1.28
+ */
+ public function invalidateTitle( LinkTarget $title ) {
+ if ( $this->isCacheable( $title ) ) {
+ $cache = ObjectCache::getMainWANInstance();
+ $cache->delete(
+ $cache->makeKey( 'page', $title->getNamespace(), sha1( $title->getDBkey() ) )
+ );
+ }
+ }
+
/**
* Clears cache
*/
*/
use \MediaWiki\Logger\LoggerFactory;
+use \MediaWiki\MediaWikiServices;
/**
* Class representing a MediaWiki article and history.
$title->purgeSquid();
$title->deleteTitleProtection();
+ MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
+
if ( $title->getNamespace() == NS_CATEGORY ) {
// Load the Category object, which will schedule a job to create
// the category table row if necessary. Checking a replica DB is ok
$title->touchLinks();
$title->purgeSquid();
+ MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
+
// File cache
HTMLFileCache::clearFileCache( $title );
InfoAction::invalidateCache( $title );
// Invalidate the caches of all pages which redirect here
DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'redirect' ) );
+ MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
+
// Purge CDN for this page only
$title->purgeSquid();
// Clear file cache for this page only