108 if ( !self::$instance || !self::$instance->
title->equals(
$title ) ) {
109 self::$instance =
new self(
$title );
122 return [
'partitionCache',
'fullResultCache',
'title' ];
129 $this->partitionCache = [];
130 $this->fullResultCache = [];
149 if ( !isset( $this->db ) ) {
164 public function getLinks( $table, $startId =
false, $endId =
false, $max = INF ) {
177 protected function queryLinks( $table, $startId, $endId, $max, $select =
'all' ) {
179 $fromField = $this->
getPrefix( $table ) .
'_from';
181 if ( !$startId && !$endId && is_infinite( $max )
182 && isset( $this->fullResultCache[$table] )
184 wfDebug( __METHOD__ .
": got results from cache\n" );
185 $res = $this->fullResultCache[$table];
187 wfDebug( __METHOD__ .
": got results from DB\n" );
192 $conds[] =
"$fromField >= " . intval( $startId );
195 $conds[] =
"$fromField <= " . intval( $endId );
197 $options = [
'ORDER BY' => $fromField ];
198 if ( is_finite( $max ) && $max > 0 ) {
202 if ( $select ===
'ids' ) {
206 [ $this->
getPrefix( $table ) .
'_from AS page_id' ],
207 array_filter( $conds,
function ( $clause ) {
208 return !preg_match(
'/(\b|=)page_id(\b|=)/', $clause );
217 [
'page_namespace',
'page_title',
'page_id' ],
220 array_merge( [
'STRAIGHT_JOIN' ],
$options )
224 if ( $select ===
'all' && !$startId && !$endId &&
$res->numRows() < $max ) {
226 $this->fullResultCache[$table] =
$res;
228 wfDebug( __METHOD__ .
": results from DB were uncacheable\n" );
244 'imagelinks' =>
'il',
245 'categorylinks' =>
'cl',
246 'templatelinks' =>
'tl',
250 if ( isset( $prefixes[$table] ) ) {
251 return $prefixes[$table];
254 Hooks::run(
'BacklinkCacheGetPrefix', [ $table, &$prefix ] );
258 throw new MWException(
"Invalid table \"$table\" in " . __CLASS__ );
275 case 'templatelinks':
277 "{$prefix}_namespace" => $this->
title->getNamespace(),
278 "{$prefix}_title" => $this->
title->getDBkey(),
279 "page_id={$prefix}_from"
284 "{$prefix}_namespace" => $this->
title->getNamespace(),
285 "{$prefix}_title" => $this->
title->getDBkey(),
286 $this->
getDB()->makeList( [
287 "{$prefix}_interwiki" =>
'',
288 "{$prefix}_interwiki IS NULL",
290 "page_id={$prefix}_from"
294 case 'categorylinks':
296 "{$prefix}_to" => $this->
title->getDBkey(),
297 "page_id={$prefix}_from"
302 Hooks::run(
'BacklinkCacheGetConditions', [ $table, $this->
title, &$conds ] );
304 throw new MWException(
"Invalid table \"$table\" in " . __CLASS__ );
329 $cache = ObjectCache::getMainWANInstance();
331 if ( isset( $this->partitionCache[$table] ) ) {
332 $entry = reset( $this->partitionCache[$table] );
334 return min( $max, $entry[
'numRows'] );
338 if ( isset( $this->fullResultCache[$table] ) ) {
339 return min( $max, $this->fullResultCache[$table]->numRows() );
342 $memcKey =
$cache->makeKey(
344 md5( $this->
title->getPrefixedDBkey() ),
349 $count =
$cache->get( $memcKey );
351 return min( $max, $count );
355 if ( is_infinite( $max ) ) {
362 $count = $this->
getLinks( $table,
false,
false, $max )->count();
363 if ( $count < $max ) {
364 $cache->set( $memcKey, $count, self::CACHE_EXPIRY );
368 return min( $max, $count );
382 if ( isset( $this->partitionCache[$table][$batchSize] ) ) {
383 wfDebug( __METHOD__ .
": got from partition cache\n" );
385 return $this->partitionCache[$table][$batchSize][
'batches'];
388 $cache = ObjectCache::getMainWANInstance();
389 $this->partitionCache[$table][$batchSize] =
false;
390 $cacheEntry =& $this->partitionCache[$table][$batchSize];
393 if ( isset( $this->fullResultCache[$table] ) ) {
394 $cacheEntry = $this->
partitionResult( $this->fullResultCache[$table], $batchSize );
395 wfDebug( __METHOD__ .
": got from full result cache\n" );
397 return $cacheEntry[
'batches'];
400 $memcKey =
$cache->makeKey(
402 md5( $this->
title->getPrefixedDBkey() ),
408 $memcValue =
$cache->get( $memcKey );
409 if ( is_array( $memcValue ) ) {
410 $cacheEntry = $memcValue;
411 wfDebug( __METHOD__ .
": got from memcached $memcKey\n" );
413 return $cacheEntry[
'batches'];
417 $cacheEntry = [
'numRows' => 0,
'batches' => [] ];
420 $selectSize = max( $batchSize, 200000 - ( 200000 % $batchSize ) );
423 $res = $this->
queryLinks( $table, $start,
false, $selectSize,
'ids' );
426 $cacheEntry[
'numRows'] += $partitions[
'numRows'];
427 $cacheEntry[
'batches'] = array_merge( $cacheEntry[
'batches'], $partitions[
'batches'] );
428 if ( count( $partitions[
'batches'] ) ) {
429 list( , $lEnd ) = end( $partitions[
'batches'] );
432 }
while ( $partitions[
'numRows'] >= $selectSize );
434 if ( count( $cacheEntry[
'batches'] ) ) {
435 $cacheEntry[
'batches'][0][0] =
false;
436 $cacheEntry[
'batches'][count( $cacheEntry[
'batches'] ) - 1][1] =
false;
440 $cache->set( $memcKey, $cacheEntry, self::CACHE_EXPIRY );
443 $memcKey =
$cache->makeKey(
445 md5( $this->
title->getPrefixedDBkey() ),
448 $cache->set( $memcKey, $cacheEntry[
'numRows'], self::CACHE_EXPIRY );
450 wfDebug( __METHOD__ .
": got from database\n" );
452 return $cacheEntry[
'batches'];
465 $numRows =
$res->numRows();
466 $numBatches = ceil( $numRows / $batchSize );
468 for ( $i = 0; $i < $numBatches; $i++ ) {
469 if ( $i == 0 && $isComplete ) {
472 $rowNum = $i * $batchSize;
473 $res->seek( $rowNum );
474 $row =
$res->fetchObject();
475 $start = (int)$row->page_id;
478 if ( $i == ( $numBatches - 1 ) && $isComplete ) {
481 $rowNum = min( $numRows - 1, ( $i + 1 ) * $batchSize - 1 );
482 $res->seek( $rowNum );
483 $row =
$res->fetchObject();
484 $end = (int)$row->page_id;
488 if ( $start && $end && $start > $end ) {
489 throw new MWException( __METHOD__ .
': Internal error: query result out of order' );
492 $batches[] = [ $start, $end ];
495 return [
'numRows' => $numRows,
'batches' => $batches ];
509 $resSets[] =
$dbr->select(
510 [
'templatelinks',
'page_restrictions',
'page' ],
511 [
'page_namespace',
'page_title',
'page_id' ],
513 'tl_namespace' => $this->
title->getNamespace(),
514 'tl_title' => $this->title->getDBkey(),
523 $resSets[] =
$dbr->select(
524 [
'imagelinks',
'page_restrictions',
'page' ],
525 [
'page_namespace',
'page_title',
'page_id' ],
527 'il_to' => $this->
title->getDBkey(),
539 foreach ( $resSets
as $res ) {
540 foreach (
$res as $row ) {
541 $mergedRes[$row->page_id] = $row;
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for use
$wgUpdateRowsPerJob
Number of rows to update per job.
wfDebug( $text, $dest='all', array $context=[])
Sends a line to the debug log if enabled or, optionally, to a comment in output.
wfGetDB( $db, $groups=[], $wiki=false)
Get a Database object.
Class for fetching backlink lists, approximate backlink counts and partitions.
getCascadeProtectedLinks()
Get a Title iterator for cascade-protected template/file use backlinks.
array[] $partitionCache
Multi dimensions array representing batches.
queryLinks( $table, $startId, $endId, $max, $select='all')
Get the backlinks for a given table.
getLinks( $table, $startId=false, $endId=false, $max=INF)
Get the backlinks for a given table.
partition( $table, $batchSize)
Partition the backlinks into batches.
getPrefix( $table)
Get the field name prefix for a given table.
partitionResult( $res, $batchSize, $isComplete=true)
Partition a DB result with backlinks in it into batches.
__construct(Title $title)
Create a new BacklinkCache.
clear()
Clear locally stored data and database object.
getDB()
Get the replica DB connection to the database When non existing, will initialize the connection.
__sleep()
Serialization handler, diasallows to serialize the database to prevent failures after this class is d...
getNumLinks( $table, $max=INF)
Get the approximate number of backlinks.
hasLinks( $table)
Check if there are any backlinks.
setDB( $db)
Set the Database object to use.
$db
Local copy of a database object.
ResultWrapper[] $fullResultCache
Contains the whole links from a database result.
getConditions( $table)
Get the SQL condition array for selecting backlinks, with a join on the page table.
$title
Local copy of a Title object.
static BacklinkCache $instance
static newFromResult( $res)
Represents a title within MediaWiki.
deferred txt A few of the database updates required by various functions here can be deferred until after the result page is displayed to the user For updating the view updating the linked to tables after a etc PHP does not yet have any way to tell the server to actually return and disconnect while still running these but it might have such a feature in the future We handle these by creating a deferred update object and putting those objects on a global list
when a variable name is used in a it is silently declared as a new local masking the global
This document is intended to provide useful advice for parties seeking to redistribute MediaWiki to end users It s targeted particularly at maintainers for Linux since it s been observed that distribution packages of MediaWiki often break We ve consistently had to recommend that users seeking support use official tarballs instead of their distribution s and this often solves whatever problem the user is having It would be nice if this could such as
the array() calling protocol came about after MediaWiki 1.4rc1.
this hook is for auditing only RecentChangesLinked and Watchlist RecentChangesLinked and Watchlist Do not use this to implement individual filters if they are compatible with the ChangesListFilter and ChangesListFilterGroup structure use sub classes of those in conjunction with the ChangesListSpecialPageStructuredFilters hook This hook can be used to implement filters that do not implement that or custom behavior that is not an individual filter e g Watchlist and Watchlist you will want to construct new ChangesListBooleanFilter or ChangesListStringOptionsFilter objects When constructing you specify which group they belong to You can reuse existing or create your you must register them with $special registerFilterGroup removed from all revisions and log entries to which it was applied This gives extensions a chance to take it off their books as the deletion has already been partly carried out by this point or something similar the user will be unable to create the tag set and then return false from the hook function Ensure you consume the ChangeTagAfterDelete hook to carry out custom deletion actions as context called by AbstractContent::getParserOutput May be used to override the normal model specific rendering of page content as context as context $options
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php