275 lines
6.7 KiB
PHP
275 lines
6.7 KiB
PHP
<?php
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/**
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* Page existence cache.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Cache
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*/
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/**
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* Cache for article titles (prefixed DB keys) and ids linked from one source
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*
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* @ingroup Cache
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*/
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class LinkCache {
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/**
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* @var HashBagOStuff
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*/
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private $mGoodLinks;
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/**
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* @var HashBagOStuff
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*/
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private $mBadLinks;
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private $mForUpdate = false;
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/**
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* How many Titles to store. There are two caches, so the amount actually
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* stored in memory can be up to twice this.
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*/
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const MAX_SIZE = 10000;
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/**
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* @var LinkCache
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*/
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protected static $instance;
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public function __construct() {
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$this->mGoodLinks = new HashBagOStuff( array( 'maxKeys' => self::MAX_SIZE ) );
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$this->mBadLinks = new HashBagOStuff( array( 'maxKeys' => self::MAX_SIZE ) );
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}
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/**
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* Get an instance of this class.
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*
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* @return LinkCache
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*/
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public static function &singleton() {
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if ( !self::$instance ) {
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self::$instance = new LinkCache;
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}
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return self::$instance;
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}
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/**
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* Destroy the singleton instance
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*
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* A new one will be created next time singleton() is called.
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*
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* @since 1.22
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*/
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public static function destroySingleton() {
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self::$instance = null;
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}
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/**
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* Set the singleton instance to a given object.
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*
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* Since we do not have an interface for LinkCache, you have to be sure the
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* given object implements all the LinkCache public methods.
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*
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* @param LinkCache $instance
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* @since 1.22
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*/
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public static function setSingleton( LinkCache $instance ) {
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self::$instance = $instance;
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}
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/**
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* General accessor to get/set whether the master DB should be used
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*
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* This used to also set the FOR UPDATE option (locking the rows read
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* in order to avoid link table inconsistency), which was later removed
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* for performance on wikis with a high edit rate.
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*
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* @param bool $update
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* @return bool
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*/
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public function forUpdate( $update = null ) {
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return wfSetVar( $this->mForUpdate, $update );
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}
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/**
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* @param string $title
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* @return int Page ID or zero
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*/
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public function getGoodLinkID( $title ) {
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$info = $this->mGoodLinks->get( $title );
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if ( !$info ) {
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return 0;
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}
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return $info['id'];
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}
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/**
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* Get a field of a title object from cache.
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* If this link is not a cached good title, it will return NULL.
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* @param Title $title
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* @param string $field ('length','redirect','revision','model')
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* @return string|int|null
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*/
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public function getGoodLinkFieldObj( $title, $field ) {
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$dbkey = $title->getPrefixedDBkey();
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$info = $this->mGoodLinks->get( $dbkey );
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if ( !$info ) {
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return null;
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}
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return $info[$field];
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}
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/**
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* @param string $title
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* @return bool
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*/
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public function isBadLink( $title ) {
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// Use get() to ensure it records as used for LRU.
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return $this->mBadLinks->get( $title ) !== false;
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}
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/**
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* Add a link for the title to the link cache
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*
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* @param int $id Page's ID
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* @param Title $title
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* @param int $len Text's length
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* @param int $redir Whether the page is a redirect
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* @param int $revision Latest revision's ID
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* @param string|null $model Latest revision's content model ID
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*/
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public function addGoodLinkObj( $id, Title $title, $len = -1, $redir = null,
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$revision = 0, $model = null
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) {
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$dbkey = $title->getPrefixedDBkey();
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$this->mGoodLinks->set( $dbkey, array(
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'id' => (int)$id,
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'length' => (int)$len,
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'redirect' => (int)$redir,
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'revision' => (int)$revision,
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'model' => $model ? (string)$model : null,
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) );
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}
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/**
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* Same as above with better interface.
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* @since 1.19
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* @param Title $title
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* @param stdClass $row Object which has the fields page_id, page_is_redirect,
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* page_latest and page_content_model
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*/
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public function addGoodLinkObjFromRow( Title $title, $row ) {
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$dbkey = $title->getPrefixedDBkey();
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$this->mGoodLinks->set( $dbkey, array(
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'id' => intval( $row->page_id ),
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'length' => intval( $row->page_len ),
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'redirect' => intval( $row->page_is_redirect ),
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'revision' => intval( $row->page_latest ),
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'model' => !empty( $row->page_content_model ) ? strval( $row->page_content_model ) : null,
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) );
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}
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/**
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* @param Title $title
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*/
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public function addBadLinkObj( Title $title ) {
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$dbkey = $title->getPrefixedDBkey();
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if ( !$this->isBadLink( $dbkey ) ) {
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$this->mBadLinks->set( $dbkey, 1 );
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}
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}
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public function clearBadLink( $title ) {
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$this->mBadLinks->clear( array( $title ) );
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}
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/**
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* @param Title $title
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*/
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public function clearLink( $title ) {
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$dbkey = $title->getPrefixedDBkey();
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$this->mBadLinks->delete( $dbkey );
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$this->mGoodLinks->delete( $dbkey );
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}
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/**
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* Add a title to the link cache, return the page_id or zero if non-existent
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*
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* @param string $title Title to add
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* @return int Page ID or zero
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*/
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public function addLink( $title ) {
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$nt = Title::newFromDBkey( $title );
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if ( !$nt ) {
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return 0;
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}
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return $this->addLinkObj( $nt );
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}
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/**
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* Add a title to the link cache, return the page_id or zero if non-existent
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*
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* @param Title $nt Title object to add
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* @return int Page ID or zero
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*/
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public function addLinkObj( Title $nt ) {
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global $wgContentHandlerUseDB;
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$key = $nt->getPrefixedDBkey();
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if ( $this->isBadLink( $key ) || $nt->isExternal() ) {
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return 0;
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}
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$id = $this->getGoodLinkID( $key );
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if ( $id != 0 ) {
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return $id;
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}
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if ( $key === '' ) {
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return 0;
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}
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// Some fields heavily used for linking...
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$db = $this->mForUpdate ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
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$fields = array( 'page_id', 'page_len', 'page_is_redirect', 'page_latest' );
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if ( $wgContentHandlerUseDB ) {
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$fields[] = 'page_content_model';
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}
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$row = $db->selectRow( 'page', $fields,
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array( 'page_namespace' => $nt->getNamespace(), 'page_title' => $nt->getDBkey() ),
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__METHOD__
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);
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if ( $row !== false ) {
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$this->addGoodLinkObjFromRow( $nt, $row );
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$id = intval( $row->page_id );
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} else {
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$this->addBadLinkObj( $nt );
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$id = 0;
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}
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return $id;
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}
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/**
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* Clears cache
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*/
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public function clear() {
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$this->mGoodLinks->clear();
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$this->mBadLinks->clear();
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}
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}
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