<?php
/**
* Cache for article titles (prefixed DB keys) and ids linked from one source
- * @package MediaWiki
- * @subpackage Cache
- */
-
-/**
*
+ * @ingroup Cache
*/
-# These are used in incrementalSetup()
-define ('LINKCACHE_GOOD', 0);
-define ('LINKCACHE_BAD', 1);
-define ('LINKCACHE_IMAGE', 2);
-define ('LINKCACHE_PAGE', 3);
-
-/**
- * @package MediaWiki
- * @subpackage Cache
- */
-class LinkCache {
+class LinkCache {
// Increment $mClassVer whenever old serialized versions of this class
// becomes incompatible with the new version.
- /* private */ var $mClassVer = 3;
+ /* private */ var $mClassVer = 4;
- /* private */ var $mPageLinks;
- /* private */ var $mGoodLinks, $mBadLinks, $mActive;
- /* private */ var $mImageLinks, $mCategoryLinks;
- /* private */ var $mPreFilled, $mOldGoodLinks, $mOldBadLinks;
+ /* private */ var $mGoodLinks, $mBadLinks;
/* private */ var $mForUpdate;
- /* private */ function getKey( $title ) {
- global $wgDBname;
- return $wgDBname.':lc:title:'.$title;
+ /**
+ * Get an instance of this class
+ */
+ static function &singleton() {
+ static $instance;
+ if ( !isset( $instance ) ) {
+ $instance = new LinkCache;
+ }
+ return $instance;
}
-
- function LinkCache() {
- $this->mActive = true;
- $this->mPreFilled = false;
+
+ function __construct() {
$this->mForUpdate = false;
- $this->mPageLinks = array();
$this->mGoodLinks = array();
+ $this->mGoodLinkFields = array();
$this->mBadLinks = array();
- $this->mImageLinks = array();
- $this->mCategoryLinks = array();
- $this->mOldGoodLinks = array();
- $this->mOldBadLinks = array();
- $this->mOldPageLinks = array();
}
/**
* General accessor to get/set whether SELECT FOR UPDATE should be used
*/
- function forUpdate( $update = NULL ) {
+ public function forUpdate( $update = null ) {
return wfSetVar( $this->mForUpdate, $update );
}
-
- function getGoodLinkID( $title ) {
+
+ public function getGoodLinkID( $title ) {
if ( array_key_exists( $title, $this->mGoodLinks ) ) {
return $this->mGoodLinks[$title];
} else {
}
}
- function isBadLink( $title ) {
- return array_key_exists( $title, $this->mBadLinks );
- }
-
- function addGoodLinkObj( $id, $title ) {
- if ( $this->mActive ) {
- $dbkey = $title->getPrefixedDbKey();
- $this->mGoodLinks[$dbkey] = $id;
- $this->mPageLinks[$dbkey] = $title;
- }
- }
-
- function addBadLinkObj( $title ) {
+ /**
+ * Get a field of a title object from cache.
+ * If this link is not good, it will return NULL.
+ * @param Title $title
+ * @param string $field ('length','redirect')
+ * @return mixed
+ */
+ public function getGoodLinkFieldObj( $title, $field ) {
$dbkey = $title->getPrefixedDbKey();
- if ( $this->mActive && ( ! $this->isBadLink( $dbkey ) ) ) {
- $this->mBadLinks[$dbkey] = 1;
- $this->mPageLinks[$dbkey] = $title;
+ if ( array_key_exists( $dbkey, $this->mGoodLinkFields ) ) {
+ return $this->mGoodLinkFields[$dbkey][$field];
+ } else {
+ return null;
}
}
- function addImageLink( $title ) {
- if ( $this->mActive ) { $this->mImageLinks[$title] = 1; }
+ public function isBadLink( $title ) {
+ return array_key_exists( $title, $this->mBadLinks );
}
- function addImageLinkObj( $nt ) {
- if ( $this->mActive ) { $this->mImageLinks[$nt->getDBkey()] = 1; }
- }
-
- function addCategoryLink( $title, $sortkey ) {
- if ( $this->mActive ) { $this->mCategoryLinks[$title] = $sortkey; }
+ /**
+ * Add a link for the title to the link cache
+ * @param int $id
+ * @param Title $title
+ * @param int $len
+ * @param int $redir
+ */
+ public function addGoodLinkObj( $id, $title, $len = -1, $redir = null ) {
+ $dbkey = $title->getPrefixedDbKey();
+ $this->mGoodLinks[$dbkey] = intval( $id );
+ $this->mGoodLinkFields[$dbkey] = array(
+ 'length' => intval( $len ),
+ 'redirect' => intval( $redir ) );
}
-
- function addCategoryLinkObj( &$nt, $sortkey ) {
- $this->addCategoryLink( $nt->getDBkey(), $sortkey );
+
+ public function addBadLinkObj( $title ) {
+ $dbkey = $title->getPrefixedDbKey();
+ if ( !$this->isBadLink( $dbkey ) ) {
+ $this->mBadLinks[$dbkey] = 1;
+ }
}
- function clearBadLink( $title ) {
+ public function clearBadLink( $title ) {
unset( $this->mBadLinks[$title] );
- $this->clearLink( $title );
}
-
- function clearLink( $title ) {
- global $wgMemc, $wgLinkCacheMemcached;
- if( $wgLinkCacheMemcached )
- $wgMemc->delete( $this->getKey( $title ) );
+
+ public function clearLink( $title ) {
+ $dbkey = $title->getPrefixedDbKey();
+ if( isset($this->mBadLinks[$dbkey]) ) {
+ unset($this->mBadLinks[$dbkey]);
+ }
+ if( isset($this->mGoodLinks[$dbkey]) ) {
+ unset($this->mGoodLinks[$dbkey]);
+ }
+ if( isset($this->mGoodLinkFields[$dbkey]) ) {
+ unset($this->mGoodLinkFields[$dbkey]);
+ }
}
- function suspend() { $this->mActive = false; }
- function resume() { $this->mActive = true; }
- function getPageLinks() { return $this->mPageLinks; }
- function getGoodLinks() { return $this->mGoodLinks; }
- function getBadLinks() { return array_keys( $this->mBadLinks ); }
- function getImageLinks() { return $this->mImageLinks; }
- function getCategoryLinks() { return $this->mCategoryLinks; }
+ public function getGoodLinks() { return $this->mGoodLinks; }
+ public function getBadLinks() { return array_keys( $this->mBadLinks ); }
- function addLink( $title ) {
+ /**
+ * Add a title to the link cache, return the page_id or zero if non-existent
+ * @param $title String: title to add
+ * @param $len int, page size
+ * @param $redir bool, is redirect?
+ * @return integer
+ */
+ public function addLink( $title, $len = -1, $redir = null ) {
$nt = Title::newFromDBkey( $title );
if( $nt ) {
- return $this->addLinkObj( $nt );
+ return $this->addLinkObj( $nt, $len, $redir );
} else {
return 0;
}
}
-
- function addLinkObj( &$nt ) {
- global $wgMemc, $wgLinkCacheMemcached, $wgAntiLockFlags;
- $title = $nt->getPrefixedDBkey();
- if ( $this->isBadLink( $title ) ) { return 0; }
- $id = $this->getGoodLinkID( $title );
- if ( 0 != $id ) { return $id; }
-
- $fname = 'LinkCache::addLinkObj';
- wfProfileIn( $fname );
-
- $ns = $nt->getNamespace();
- $t = $nt->getDBkey();
- if ( '' == $title ) {
- wfProfileOut( $fname );
- return 0;
- }
-
- $id = NULL;
- if( $wgLinkCacheMemcached )
- $id = $wgMemc->get( $key = $this->getKey( $title ) );
- if( ! is_integer( $id ) ) {
- if ( $this->mForUpdate ) {
- $db =& wfGetDB( DB_MASTER );
- if ( !( $wgAntiLockFlags & ALF_NO_LINK_LOCK ) ) {
- $options = array( 'FOR UPDATE' );
- }
- } else {
- $db =& wfGetDB( DB_SLAVE );
- $options = array();
- }
+ /**
+ * Add a title to the link cache, return the page_id or zero if non-existent
+ * @param $nt Title to add.
+ * @param $len int, page size
+ * @param $redir bool, is redirect?
+ * @return integer
+ */
+ public function addLinkObj( &$nt, $len = -1, $redirect = null ) {
+ global $wgAntiLockFlags, $wgProfiler;
+ wfProfileIn( __METHOD__ );
- $id = $db->selectField( 'page', 'page_id', array( 'page_namespace' => $ns, 'page_title' => $t ), $fname, $options );
- if ( !$id ) {
- $id = 0;
- }
- if( $wgLinkCacheMemcached )
- $wgMemc->add( $key, $id, 3600*24 );
+ $key = $nt->getPrefixedDBkey();
+ if ( $this->isBadLink( $key ) ) {
+ wfProfileOut( __METHOD__ );
+ return 0;
}
-
- if( 0 == $id ) {
- $this->addBadLinkObj( $nt );
- } else {
- $this->addGoodLinkObj( $id, $nt );
+ $id = $this->getGoodLinkID( $key );
+ if ( $id != 0 ) {
+ wfProfileOut( __METHOD__ );
+ return $id;
}
- wfProfileOut( $fname );
- return $id;
- }
- /**
- * Bulk-check the pagelinks and page arrays for existence info.
- * @param Title $fromtitle
- */
- function preFill( &$fromtitle ) {
- global $wgAntiLockFlags;
- $fname = 'LinkCache::preFill';
- wfProfileIn( $fname );
-
- $this->suspend();
- $id = $fromtitle->getArticleID();
- $this->resume();
-
- if( $id == 0 ) {
- wfDebug( "$fname - got id 0 for title '" . $fromtitle->getPrefixedDBkey() . "'\n" );
- wfProfileOut( $fname );
- return;
+ if ( $key === '' ) {
+ wfProfileOut( __METHOD__ );
+ return 0;
}
+ # Some fields heavily used for linking...
if ( $this->mForUpdate ) {
- $db =& wfGetDB( DB_MASTER );
+ $db = wfGetDB( DB_MASTER );
if ( !( $wgAntiLockFlags & ALF_NO_LINK_LOCK ) ) {
- $options = 'FOR UPDATE';
+ $options = array( 'FOR UPDATE' );
} else {
- $options = '';
+ $options = array();
}
} else {
- $db =& wfGetDB( DB_SLAVE );
- $options = '';
- }
-
- $page = $db->tableName( 'page' );
- $pagelinks = $db->tableName( 'pagelinks' );
-
- $sql = "SELECT page_id,pl_namespace,pl_title
- FROM $pagelinks
- LEFT JOIN $page
- ON pl_namespace=page_namespace AND pl_title=page_title
- WHERE pl_from=$id $options";
- $res = $db->query( $sql, $fname );
- while( $s = $db->fetchObject( $res ) ) {
- $title = Title::makeTitle( $s->pl_namespace, $s->pl_title );
- if( $s->page_id ) {
- $this->addGoodLinkObj( $s->page_id, $title );
- } else {
- $this->addBadLinkObj( $title );
- }
- }
- $this->mPreFilled = true;
-
- wfProfileOut( $fname );
- }
-
- function getGoodAdditions() {
- return array_diff( $this->mGoodLinks, $this->mOldGoodLinks );
- }
-
- function getBadAdditions() {
- #wfDebug( "mOldBadLinks: " . implode( ', ', array_keys( $this->mOldBadLinks ) ) . "\n" );
- #wfDebug( "mBadLinks: " . implode( ', ', array_keys( $this->mBadLinks ) ) . "\n" );
- return array_values( array_diff( array_keys( $this->mBadLinks ), array_keys( $this->mOldBadLinks ) ) );
- }
-
- function getImageAdditions() {
- return array_diff_assoc( $this->mImageLinks, $this->mOldImageLinks );
- }
-
- function getGoodDeletions() {
- return array_diff( $this->mOldGoodLinks, $this->mGoodLinks );
- }
-
- function getBadDeletions() {
- return array_values( array_diff( array_keys( $this->mOldBadLinks ), array_keys( $this->mBadLinks ) ));
- }
-
- function getImageDeletions() {
- return array_diff_assoc( $this->mOldImageLinks, $this->mImageLinks );
- }
-
- function getPageAdditions() {
- $set = array_diff( array_keys( $this->mPageLinks ), array_keys( $this->mOldPageLinks ) );
- $out = array();
- foreach( $set as $key ) {
- $out[$key] = $this->mPageLinks[$key];
- }
- return $out;
- }
-
- function getPageDeletions() {
- $set = array_diff( array_keys( $this->mOldPageLinks ), array_keys( $this->mPageLinks ) );
- $out = array();
- foreach( $set as $key ) {
- $out[$key] = $this->mOldPageLinks[$key];
- }
- return $out;
- }
-
- /**
- * Parameters:
- * @param $which is one of the LINKCACHE_xxx constants
- * @param $del,$add are the incremental update arrays which will be filled.
- *
- * @return Returns whether or not it's worth doing the incremental version.
- *
- * For example, if [[List of mathematical topics]] was blanked,
- * it would take a long, long time to do incrementally.
- */
- function incrementalSetup( $which, &$del, &$add ) {
- if ( ! $this->mPreFilled ) {
- return false;
+ $db = wfGetDB( DB_SLAVE );
+ $options = array();
+ }
+
+ $s = $db->selectRow( 'page',
+ array( 'page_id', 'page_len', 'page_is_redirect' ),
+ array( 'page_namespace' => $nt->getNamespace(), 'page_title' => $nt->getDBkey() ),
+ __METHOD__, $options );
+ # Set fields...
+ if ( $s !== false ) {
+ $id = intval( $s->page_id );
+ $len = intval( $s->page_len );
+ $redirect = intval( $s->page_is_redirect );
+ } else {
+ $len = -1;
+ $redirect = 0;
}
- switch ( $which ) {
- case LINKCACHE_GOOD:
- $old =& $this->mOldGoodLinks;
- $cur =& $this->mGoodLinks;
- $del = $this->getGoodDeletions();
- $add = $this->getGoodAdditions();
- break;
- case LINKCACHE_BAD:
- $old =& $this->mOldBadLinks;
- $cur =& $this->mBadLinks;
- $del = $this->getBadDeletions();
- $add = $this->getBadAdditions();
- break;
- case LINKCACHE_PAGE:
- $old =& $this->mOldPageLinks;
- $cur =& $this->mPageLinks;
- $del = $this->getPageDeletions();
- $add = $this->getPageAdditions();
- break;
- default: # LINKCACHE_IMAGE
- return false;
+ if ( $id == 0 ) {
+ $this->addBadLinkObj( $nt );
+ } else {
+ $this->addGoodLinkObj( $id, $nt, $len, $redirect );
}
-
- return true;
+ wfProfileOut( __METHOD__ );
+ return $id;
}
/**
- * Clears cache
+ * Clears cache
*/
- function clear() {
- $this->mPageLinks = array();
+ public function clear() {
$this->mGoodLinks = array();
+ $this->mGoodLinkFields = array();
$this->mBadLinks = array();
- $this->mImageLinks = array();
- $this->mCategoryLinks = array();
- $this->mOldGoodLinks = array();
- $this->mOldBadLinks = array();
- $this->mOldPageLinks = array();
- }
-
- /**
- * Swaps old and current link registers
- */
- function swapRegisters() {
- swap( $this->mGoodLinks, $this->mOldGoodLinks );
- swap( $this->mBadLinks, $this->mOldBadLinks );
- swap( $this->mImageLinks, $this->mOldImageLinks );
- swap( $this->mPageLinks, $this->mOldPageLinks );
- }
-}
-
-/**
- * Class representing a list of titles
- * The execute() method checks them all for existence and adds them to a LinkCache object
- +
- * @package MediaWiki
- * @subpackage Cache
- */
-class LinkBatch {
- /**
- * 2-d array, first index namespace, second index dbkey, value arbitrary
- */
- var $data = array();
-
- function LinkBatch( $arr = array() ) {
- foreach( $arr as $item ) {
- $this->addObj( $item );
- }
- }
-
- function addObj( $title ) {
- $this->add( $title->getNamespace(), $title->getDBkey() );
- }
-
- function add( $ns, $dbkey ) {
- if ( $ns < 0 ) {
- return;
- }
- if ( !array_key_exists( $ns, $this->data ) ) {
- $this->data[$ns] = array();
- }
-
- $this->data[$ns][$dbkey] = 1;
- }
-
- function execute( &$cache ) {
- $fname = 'LinkBatch::execute';
- $namespaces = array();
-
- if ( !count( $this->data ) ) {
- return;
- }
-
- wfProfileIn( $fname );
-
- // Construct query
- // This is very similar to Parser::replaceLinkHolders
- $dbr = wfGetDB( DB_SLAVE );
- $page = $dbr->tableName( 'page' );
- $sql = "SELECT page_id, page_namespace, page_title FROM $page WHERE "
- . $this->constructSet( 'page', $dbr );
-
- // Do query
- $res = $dbr->query( $sql, $fname );
-
- // Process results
- // For each returned entry, add it to the list of good links, and remove it from $remaining
-
- $remaining = $this->data;
- while ( $row = $dbr->fetchObject( $res ) ) {
- $title = Title::makeTitle( $row->page_namespace, $row->page_title );
- $cache->addGoodLinkObj( $row->page_id, $title );
- unset( $remaining[$row->page_namespace][$row->page_title] );
- }
- $dbr->freeResult( $res );
-
- // The remaining links in $data are bad links, register them as such
- foreach ( $remaining as $ns => $dbkeys ) {
- foreach ( $dbkeys as $dbkey => $nothing ) {
- $title = Title::makeTitle( $ns, $dbkey );
- $cache->addBadLinkObj( $title );
- }
- }
-
- wfProfileOut( $fname );
- }
-
- /**
- * Construct a WHERE clause which will match all the given titles.
- * Give the appropriate table's field name prefix ('page', 'pl', etc).
- *
- * @param string $prefix
- * @return string
- * @access public
- */
- function constructSet( $prefix, $db ) {
- $first = true;
- $sql = '';
- foreach ( $this->data as $ns => $dbkeys ) {
- if ( !count( $dbkeys ) ) {
- continue;
- }
-
- if ( $first ) {
- $first = false;
- } else {
- $sql .= ' OR ';
- }
- $sql .= "({$prefix}_namespace=$ns AND {$prefix}_title IN (";
-
- $firstTitle = true;
- foreach( $dbkeys as $dbkey => $nothing ) {
- if ( $firstTitle ) {
- $firstTitle = false;
- } else {
- $sql .= ',';
- }
- $sql .= $db->addQuotes( $dbkey );
- }
-
- $sql .= '))';
- }
- return $sql;
}
}
-
-?>
scripts.mit.edu / autoinstallsdev / mediawiki.git / blobdiff