* @file
* @ingroup Cache
*/
+
+use Wikimedia\Rdbms\Database;
+use Wikimedia\Rdbms\IDatabase;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\MediaWikiServices;
* @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 $this->addLinkObj( $nt );
}
+ /**
+ * Fields that LinkCache needs to select
+ *
+ * @since 1.28
+ * @return array
+ */
+ public static function getSelectFields() {
+ global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
+
+ $fields = [ 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ];
+ if ( $wgContentHandlerUseDB ) {
+ $fields[] = 'page_content_model';
+ }
+ if ( $wgPageLanguageUseDB ) {
+ $fields[] = 'page_lang';
+ }
+
+ return $fields;
+ }
+
/**
* Add a title to the link cache, return the page_id or zero if non-existent
*
* @return int Page ID or zero
*/
public function addLinkObj( LinkTarget $nt ) {
- global $wgContentHandlerUseDB, $wgPageLanguageUseDB;
-
$key = $this->titleFormatter->getPrefixedDBkey( $nt );
- if ( $this->isBadLink( $key ) || $nt->isExternal() ) {
+ if ( $this->isBadLink( $key ) || $nt->isExternal()
+ || $nt->inNamespace( NS_SPECIAL )
+ ) {
return 0;
}
$id = $this->getGoodLinkID( $key );
return 0;
}
- // Some fields heavily used for linking...
- $db = $this->mForUpdate ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
+ // 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 );
- $fields = [ 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ];
- if ( $wgContentHandlerUseDB ) {
- $fields[] = 'page_content_model';
- }
- if ( $wgPageLanguageUseDB ) {
- $fields[] = 'page_lang';
- }
+ $row = $this->fetchPageRow( $dbr, $nt );
+ $mtime = $row ? wfTimestamp( TS_UNIX, $row->page_touched ) : false;
+ $ttl = $cache->adaptiveTTL( $mtime, $ttl );
- $row = $db->selectRow( 'page', $fields,
- [ 'page_namespace' => $nt->getNamespace(), 'page_title' => $nt->getDBkey() ],
- __METHOD__
- );
+ return $row;
+ }
+ );
+ } else {
+ $row = $this->fetchPageRow( wfGetDB( DB_REPLICA ), $nt );
+ }
- if ( $row !== false ) {
+ if ( $row ) {
$this->addGoodLinkObjFromRow( $nt, $row );
$id = intval( $row->page_id );
} else {
return $id;
}
+ /**
+ * @param WANObjectCache $cache
+ * @param TitleValue $t
+ * @return string[]
+ * @since 1.28
+ */
+ public function getMutableCacheKeys( WANObjectCache $cache, TitleValue $t ) {
+ if ( $this->isCacheable( $t ) ) {
+ return [ $cache->makeKey( 'page', $t->getNamespace(), sha1( $t->getDBkey() ) ) ];
+ }
+
+ return [];
+ }
+
+ 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
*/