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<?php
/**
* See deferred.txt
* @package MediaWiki
*/
/**
* @todo document
* @package MediaWiki
*/
class LinksUpdate {
/**#@+
* @access private
*/
var $mId, $mTitle;
/**#@-*/
/**
* Constructor
* Initialize private variables
* @param integer $id
* @param string $title
*/
function LinksUpdate( $id, $title ) {
$this->mId = $id;
$this->mTitle = $title;
}
/**
* Update link tables with outgoing links from an updated article
* Relies on the 'link cache' to be filled out.
*/
function doUpdate() {
global $wgUseDumbLinkUpdate, $wgLinkCache, $wgDBtransactions;
global $wgUseCategoryMagic;
if ( $wgUseDumbLinkUpdate ) {
$this->doDumbUpdate();
return;
}
$fname = 'LinksUpdate::doUpdate';
wfProfileIn( $fname );
$del = array();
$add = array();
$dbw =& wfGetDB( DB_MASTER );
$pagelinks = $dbw->tableName( 'pagelinks' );
$imagelinks = $dbw->tableName( 'imagelinks' );
$categorylinks = $dbw->tableName( 'categorylinks' );
#------------------------------------------------------------------------------
# Good links
if ( $wgLinkCache->incrementalSetup( LINKCACHE_PAGE, $del, $add ) ) {
# Delete where necessary
if ( count( $del ) ) {
$batch = new LinkBatch( $del );
$set = $batch->constructSet( 'pl', $dbw );
if ( $set ) {
$sql = "DELETE FROM $pagelinks WHERE pl_from={$this->mId} AND ($set)";
$dbw->query( $sql, $fname );
}
}
} else {
# Delete everything
$dbw->delete( 'pagelinks', array( 'pl_from' => $this->mId ), $fname );
# Get the addition list
$add = $wgLinkCache->getPageLinks();
}
# Do the insertion
if( 0 != count( $add ) ) {
$arr = array();
foreach( $add as $lt => $target ) {
array_push( $arr, array(
'pl_from' => $this->mId,
'pl_namespace' => $target->getNamespace(),
'pl_title' => $target->getDbKey() ) );
}
# The link cache was constructed without FOR UPDATE, so there may be collisions
# Ignoring for now, I'm not sure if that causes problems or not, but I'm fairly
# sure it's better than without IGNORE
$dbw->insert( 'pagelinks', $arr, $fname, array( 'IGNORE' ) );
}
#------------------------------------------------------------------------------
# Image links
$dbw->delete('imagelinks',array('il_from'=>$this->mId),$fname);
# Get addition list
$add = $wgLinkCache->getImageLinks();
# Do the insertion
$sql = '';
$image = NS_IMAGE;
if ( 0 != count ( $add ) ) {
$arr = array();
foreach ($add as $iname => $val ) {
$nt = Title::makeTitle( $image, $iname );
if( !$nt ) continue;
$nt->invalidateCache();
array_push( $arr, array(
'il_from' => $this->mId,
'il_to' => $iname ) );
}
$dbw->insert('imagelinks', $arr, $fname, array('IGNORE'));
}
#------------------------------------------------------------------------------
# Category links
if( $wgUseCategoryMagic ) {
global $messageMemc, $wgDBname;
# Get addition list
$add = $wgLinkCache->getCategoryLinks();
# select existing catlinks for this page
$res = $dbw->select( 'categorylinks',
array( 'cl_to', 'cl_sortkey' ),
array( 'cl_from' => $this->mId ),
$fname,
'FOR UPDATE' );
$del = array();
if( 0 != $dbw->numRows( $res ) ) {
while( $row = $dbw->fetchObject( $res ) ) {
if( !isset( $add[$row->cl_to] ) || $add[$row->cl_to] != $row->cl_sortkey ) {
// in the db, but no longer in the page
// or sortkey has changed -> delete
$del[] = $row->cl_to;
} else {
// remove already existing category memberships
// from the add array
unset( $add[$row->cl_to] );
}
}
}
// delete any removed categorylinks
if( count( $del ) > 0) {
// delete old ones
$dbw->delete( 'categorylinks',
array(
'cl_from' => $this->mId,
'cl_to' => $del ),
$fname );
foreach( $del as $cname ){
$nt = Title::makeTitle( NS_CATEGORY, $cname );
$nt->invalidateCache();
// update the timestamp which indicates when the last article
// was added or removed to/from this article
$key = $wgDBname . ':Category:' . md5( $nt->getDBkey() ) . ':adddeltimestamp';
$messageMemc->set( $key , wfTimestamp( TS_MW ), 24*3600 );
}
}
// add any new category memberships
if( count( $add ) > 0 ) {
$arr = array();
foreach( $add as $cname => $sortkey ) {
$nt = Title::makeTitle( NS_CATEGORY, $cname );
$nt->invalidateCache();
// update the timestamp which indicates when the last article
// was added or removed to/from this article
$key = $wgDBname . ':Category:' . md5( $nt->getDBkey() ) . ':adddeltimestamp';
$messageMemc->set( $key , wfTimestamp( TS_MW ), 24*3600 );
array_push( $arr, array(
'cl_from' => $this->mId,
'cl_to' => $cname,
'cl_sortkey' => $sortkey ) );
}
// do the actual sql insertion
$dbw->insert( 'categorylinks', $arr, $fname, array( 'IGNORE' ) );
}
}
wfProfileOut( $fname );
}
/**
* Link update which clears the previous entries and inserts new ones
* May be slower or faster depending on level of lock contention and write speed of DB
* Also useful where link table corruption needs to be repaired, e.g. in refreshLinks.php
*/
function doDumbUpdate() {
global $wgLinkCache, $wgDBtransactions, $wgUseCategoryMagic;
$fname = 'LinksUpdate::doDumbUpdate';
wfProfileIn( $fname );
$dbw =& wfGetDB( DB_MASTER );
$pagelinks = $dbw->tableName( 'pagelinks' );
$imagelinks = $dbw->tableName( 'imagelinks' );
$categorylinks = $dbw->tableName( 'categorylinks' );
$dbw->delete('pagelinks', array('pl_from'=>$this->mId),$fname);
$a = $wgLinkCache->getPageLinks();
if ( 0 != count( $a ) ) {
$arr = array();
foreach( $a as $lt => $target ) {
array_push( $arr, array(
'pl_from' => $this->mId,
'pl_namespace' => $target->getNamespace(),
'pl_title' => $target->getDBkey() ) );
}
$dbw->insert( 'pagelinks', $arr, $fname, array( 'IGNORE' ) );
}
$dbw->delete('imagelinks', array('il_from'=>$this->mId),$fname);
$a = $wgLinkCache->getImageLinks();
$sql = '';
if ( 0 != count ( $a ) ) {
$arr = array();
foreach( $a as $iname => $val )
array_push( $arr, array(
'il_from' => $this->mId,
'il_to' => $iname ) );
$dbw->insert( 'imagelinks', $arr, $fname, array( 'IGNORE' ) );
}
if( $wgUseCategoryMagic ) {
$dbw->delete('categorylinks', array('cl_from'=>$this->mId),$fname);
# Get addition list
$add = $wgLinkCache->getCategoryLinks();
# Do the insertion
$sql = '';
if ( 0 != count ( $add ) ) {
$arr = array();
foreach( $add as $cname => $sortkey ) {
# FIXME: Change all this to avoid unnecessary duplication
$nt = Title::makeTitle( NS_CATEGORY, $cname );
if( !$nt ) continue;
$nt->invalidateCache();
array_push( $arr, array(
'cl_from' => $this->mId,
'cl_to' => $cname,
'cl_sortkey' => $sortkey ) );
}
$dbw->insert( 'categorylinks', $arr, $fname, array( 'IGNORE' ) );
}
}
wfProfileOut( $fname );
}
}
?>
|
