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<?php
/**
* See deferred.doc
* @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 $wgUseBetterLinksUpdate, $wgLinkCache, $wgDBtransactions;
global $wgEnablePersistentLC, $wgUseCategoryMagic;
$fname = 'LinksUpdate::doUpdate';
wfProfileIn( $fname );
$del = array();
$add = array();
$dbw =& wfGetDB( DB_MASTER );
$links = $dbw->tableName( 'links' );
$brokenlinks = $dbw->tableName( 'brokenlinks' );
$imagelinks = $dbw->tableName( 'imagelinks' );
$categorylinks = $dbw->tableName( 'categorylinks' );
#------------------------------------------------------------------------------
# Good links
if ( $wgLinkCache->incrementalSetup( LINKCACHE_GOOD, $del, $add ) ) {
# Delete where necessary
if ( count( $del ) ) {
$sql = "DELETE FROM $links WHERE l_from={$this->mId} AND l_to IN(".
implode( ',', $del ) . ')';
$dbw->query( $sql, $fname );
}
} else {
# Delete everything
$dbw->delete( 'links', array( 'l_from' => $this->mId ), $fname );
# Get the addition list
$add = $wgLinkCache->getGoodLinks();
}
# Do the insertion
if ( 0 != count( $add ) ) {
$arr=array();
foreach($add as $lt=>$lid)
array_push( $arr, array(
'l_from' => $this->mId,
'l_to' => $lid ) );
# 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( 'links', $arr, $fname, array( 'IGNORE' ) );
}
#------------------------------------------------------------------------------
# Bad links
if ( $wgLinkCache->incrementalSetup( LINKCACHE_BAD, $del, $add ) ) {
# Delete where necessary
if ( count( $del ) ) {
$sql = "DELETE FROM $brokenlinks WHERE bl_from={$this->mId} AND bl_to IN(";
$first = true;
foreach( $del as $badTitle ) {
if ( $first ) {
$first = false;
} else {
$sql .= ',';
}
$sql .= $dbw->addQuotes( $badTitle );
}
$sql .= ')';
$dbw->query( $sql, $fname );
}
} else {
# Delete all
$dbw->delete( 'brokenlinks', array( 'bl_from' => $this->mId ) );
# Get addition list
$add = $wgLinkCache->getBadLinks();
}
# Do additions
$sql = '';
if ( 0 != count ( $add ) ) {
$arr = array();
foreach( $add as $blt ) {
array_push( $arr, array(
'bl_from' => $this->mId,
'bl_to' => $blt ) );
}
$dbw->insert( 'brokenlinks', $arr, $fname, array( 'IGNORE' ) );
}
#------------------------------------------------------------------------------
# Image links
$sql = "DELETE FROM $imagelinks WHERE il_from='{$this->mId}'";
$dbw->query( $sql, $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 ) {
$sql = "DELETE FROM $categorylinks WHERE cl_from='{$this->mId}'";
$dbw->query( $sql, $fname );
# Get addition list
$add = $wgLinkCache->getCategoryLinks();
# Do the insertion
$sql = '';
if ( 0 != count ( $add ) ) {
$arr = array();
foreach( $add as $cname => $sortkey ) {
$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' ) );
}
}
$this->fixBrokenLinks();
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 );
$links = $dbw->tableName( 'links' );
$brokenlinks = $dbw->tableName( 'brokenlinks' );
$imagelinks = $dbw->tableName( 'imagelinks' );
$categorylinks = $dbw->tableName( 'categorylinks' );
$sql = "DELETE FROM $links WHERE l_from={$this->mId}";
$dbw->query( $sql, $fname );
$a = $wgLinkCache->getGoodLinks();
if ( 0 != count( $a ) ) {
$arr = array();
foreach( $a as $lt => $lid ) {
array_push( $arr, array(
'l_from' => $this->mId,
'l_to' => $lid ) );
}
$dbw->insert( 'links', $arr, $fname, array( 'IGNORE' ) );
}
$sql = "DELETE FROM $brokenlinks WHERE bl_from={$this->mId}";
$dbw->query( $sql, $fname );
$a = $wgLinkCache->getBadLinks();
if ( 0 != count ( $a ) ) {
$arr = array();
foreach( $a as $blt ) {
array_push($arr,array(
'bl_from' => $this->mId,
'bl_to' => $blt));
}
$dbw->insert( 'brokenlinks', $arr, $fname, array( 'IGNORE' ) );
}
$sql = "DELETE FROM $imagelinks WHERE il_from={$this->mId}";
$dbw->query( $sql, $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 ) {
$sql = "DELETE FROM $categorylinks WHERE cl_from='{$this->mId}'";
$dbw->query( $sql, $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' ) );
}
}
$this->fixBrokenLinks();
wfProfileOut( $fname );
}
/**
* Update any brokenlinks *to* this page
* Call for a newly created page, or just to make sure state is consistent
*/
function fixBrokenLinks() {
$fname = 'LinksUpdate::fixBrokenLinks';
$dbw =& wfGetDB( DB_MASTER );
$page = $dbw->tableName( 'page' );
$links = $dbw->tableName( 'links' );
$res = $dbw->select( 'brokenlinks', array( 'bl_from' ), array( 'bl_to' => $this->mTitle ),
$fname, 'FOR UPDATE' );
if ( 0 == $dbw->numRows( $res ) ) { return; }
$arr=array();
$now = $dbw->timestamp();
$sql2 = "UPDATE $page SET page_touched='{$now}' WHERE page_id IN (";
$first = true;
while ( $row = $dbw->fetchObject( $res ) ) {
if ( ! $first ) { $sql2 .= ","; }
$first = false;
array_push( $arr, array(
'l_from' => $row->bl_from,
'l_to' => $this->mId ) );
$sql2 .= $row->bl_from;
}
$sql2 .= ')';
# Ignore errors. If a link existed in both the brokenlinks table and the links
# table, that's an error which can be fixed at this stage by simply ignoring collisions
$dbw->insert( 'links', $arr, $fname, array( 'IGNORE' ) );
$dbw->query( $sql2, $fname );
$dbw->delete( 'brokenlinks', array( 'bl_to' => $this->mTitle ), $fname );
}
}
?>
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