3 * See docs/deferred.txt
5 * @todo document (e.g. one-sentence top-level class description).
12 var $mId, //!< Page ID of the article linked from
13 $mTitle, //!< Title object of the article linked from
14 $mLinks, //!< Map of title strings to IDs for the links in the document
15 $mImages, //!< DB keys of the images used, in the array key only
16 $mTemplates, //!< Map of title strings to IDs for the template references, including broken ones
17 $mExternals, //!< URLs of external links, array key only
18 $mCategories, //!< Map of category names to sort keys
19 $mInterlangs, //!< Map of language codes to titles
20 $mProperties, //!< Map of arbitrary name to value
21 $mDb, //!< Database connection reference
22 $mOptions, //!< SELECT options to be used (array)
23 $mRecursive; //!< Whether to queue jobs for recursive updates
29 * @param Title $title Title of the page we're updating
30 * @param ParserOutput $parserOutput Output from a full parse of this page
31 * @param bool $recursive Queue jobs for recursive updates?
33 function LinksUpdate( $title, $parserOutput, $recursive = true ) {
34 global $wgAntiLockFlags;
36 if ( $wgAntiLockFlags & ALF_NO_LINK_LOCK
) {
37 $this->mOptions
= array();
39 $this->mOptions
= array( 'FOR UPDATE' );
41 $this->mDb
= wfGetDB( DB_MASTER
);
43 if ( !is_object( $title ) ) {
44 throw new MWException( "The calling convention to LinksUpdate::LinksUpdate() has changed. " .
45 "Please see Article::editUpdates() for an invocation example.\n" );
47 $this->mTitle
= $title;
48 $this->mId
= $title->getArticleID();
50 $this->mParserOutput
= $parserOutput;
51 $this->mLinks
= $parserOutput->getLinks();
52 $this->mImages
= $parserOutput->getImages();
53 $this->mTemplates
= $parserOutput->getTemplates();
54 $this->mExternals
= $parserOutput->getExternalLinks();
55 $this->mCategories
= $parserOutput->getCategories();
56 $this->mProperties
= $parserOutput->getProperties();
58 # Convert the format of the interlanguage links
59 # I didn't want to change it in the ParserOutput, because that array is passed all
60 # the way back to the skin, so either a skin API break would be required, or an
61 # inefficient back-conversion.
62 $ill = $parserOutput->getLanguageLinks();
63 $this->mInterlangs
= array();
64 foreach ( $ill as $link ) {
65 list( $key, $title ) = explode( ':', $link, 2 );
66 $this->mInterlangs
[$key] = $title;
69 $this->mRecursive
= $recursive;
70 $this->mTouchTmplLinks
= false;
72 wfRunHooks( 'LinksUpdateConstructed', array( &$this ) );
76 * Update link tables with outgoing links from an updated article
78 public function doUpdate() {
79 global $wgUseDumbLinkUpdate;
81 wfRunHooks( 'LinksUpdate', array( &$this ) );
82 if ( $wgUseDumbLinkUpdate ) {
83 $this->doDumbUpdate();
85 $this->doIncrementalUpdate();
87 wfRunHooks( 'LinksUpdateComplete', array( &$this ) );
90 protected function doIncrementalUpdate() {
91 wfProfileIn( __METHOD__
);
94 $existing = $this->getExistingLinks();
95 $this->incrTableUpdate( 'pagelinks', 'pl', $this->getLinkDeletions( $existing ),
96 $this->getLinkInsertions( $existing ) );
99 $existing = $this->getExistingImages();
101 $imageDeletes = $this->getImageDeletions( $existing );
102 $this->incrTableUpdate( 'imagelinks', 'il', $imageDeletes, $this->getImageInsertions( $existing ) );
104 # Invalidate all image description pages which had links added or removed
105 $imageUpdates = $imageDeletes +
array_diff_key( $this->mImages
, $existing );
106 $this->invalidateImageDescriptions( $imageUpdates );
109 $existing = $this->getExistingExternals();
110 $this->incrTableUpdate( 'externallinks', 'el', $this->getExternalDeletions( $existing ),
111 $this->getExternalInsertions( $existing ) );
114 $existing = $this->getExistingInterlangs();
115 $this->incrTableUpdate( 'langlinks', 'll', $this->getInterlangDeletions( $existing ),
116 $this->getInterlangInsertions( $existing ) );
119 $existing = $this->getExistingTemplates();
120 $this->incrTableUpdate( 'templatelinks', 'tl', $this->getTemplateDeletions( $existing ),
121 $this->getTemplateInsertions( $existing ) );
124 $existing = $this->getExistingCategories();
126 $categoryDeletes = $this->getCategoryDeletions( $existing );
128 $this->incrTableUpdate( 'categorylinks', 'cl', $categoryDeletes, $this->getCategoryInsertions( $existing ) );
130 # Invalidate all categories which were added, deleted or changed (set symmetric difference)
131 $categoryInserts = array_diff_assoc( $this->mCategories
, $existing );
132 $categoryUpdates = $categoryInserts +
$categoryDeletes;
133 $this->invalidateCategories( $categoryUpdates );
134 $this->updateCategoryCounts( $categoryInserts, $categoryDeletes );
137 $existing = $this->getExistingProperties();
139 $propertiesDeletes = $this->getPropertyDeletions( $existing );
141 $this->incrTableUpdate( 'page_props', 'pp', $propertiesDeletes, $this->getPropertyInsertions( $existing ) );
143 # Invalidate the necessary pages
144 $changed = $propertiesDeletes +
array_diff_assoc( $this->mProperties
, $existing );
145 $this->invalidateProperties( $changed );
147 # Refresh links of all pages including this page
148 # This will be in a separate transaction
149 if ( $this->mRecursive
) {
150 $this->queueRecursiveJobs();
153 wfProfileOut( __METHOD__
);
157 * Link update which clears the previous entries and inserts new ones
158 * May be slower or faster depending on level of lock contention and write speed of DB
159 * Also useful where link table corruption needs to be repaired, e.g. in refreshLinks.php
161 protected function doDumbUpdate() {
162 wfProfileIn( __METHOD__
);
164 # Refresh category pages and image description pages
165 $existing = $this->getExistingCategories();
166 $categoryInserts = array_diff_assoc( $this->mCategories
, $existing );
167 $categoryDeletes = array_diff_assoc( $existing, $this->mCategories
);
168 $categoryUpdates = $categoryInserts +
$categoryDeletes;
169 $existing = $this->getExistingImages();
170 $imageUpdates = array_diff_key( $existing, $this->mImages
) +
array_diff_key( $this->mImages
, $existing );
172 $this->dumbTableUpdate( 'pagelinks', $this->getLinkInsertions(), 'pl_from' );
173 $this->dumbTableUpdate( 'imagelinks', $this->getImageInsertions(), 'il_from' );
174 $this->dumbTableUpdate( 'categorylinks', $this->getCategoryInsertions(), 'cl_from' );
175 $this->dumbTableUpdate( 'templatelinks', $this->getTemplateInsertions(), 'tl_from' );
176 $this->dumbTableUpdate( 'externallinks', $this->getExternalInsertions(), 'el_from' );
177 $this->dumbTableUpdate( 'langlinks', $this->getInterlangInsertions(),'ll_from' );
178 $this->dumbTableUpdate( 'page_props', $this->getPropertyInsertions(), 'pp_page' );
180 # Update the cache of all the category pages and image description
181 # pages which were changed, and fix the category table count
182 $this->invalidateCategories( $categoryUpdates );
183 $this->updateCategoryCounts( $categoryInserts, $categoryDeletes );
184 $this->invalidateImageDescriptions( $imageUpdates );
186 # Refresh links of all pages including this page
187 # This will be in a separate transaction
188 if ( $this->mRecursive
) {
189 $this->queueRecursiveJobs();
192 wfProfileOut( __METHOD__
);
195 function queueRecursiveJobs() {
196 global $wgUpdateRowsPerJob;
197 wfProfileIn( __METHOD__
);
199 $cache = $this->mTitle
->getBacklinkCache();
200 $batches = $cache->partition( 'templatelinks', $wgUpdateRowsPerJob );
202 foreach ( $batches as $batch ) {
203 list( $start, $end ) = $batch;
208 $jobs[] = new RefreshLinksJob2( $this->mTitle
, $params );
210 Job
::batchInsert( $jobs );
212 wfProfileOut( __METHOD__
);
216 * Invalidate the cache of a list of pages from a single namespace
218 * @param integer $namespace
219 * @param array $dbkeys
221 function invalidatePages( $namespace, $dbkeys ) {
222 if ( !count( $dbkeys ) ) {
227 * Determine which pages need to be updated
228 * This is necessary to prevent the job queue from smashing the DB with
229 * large numbers of concurrent invalidations of the same page
231 $now = $this->mDb
->timestamp();
233 $res = $this->mDb
->select( 'page', array( 'page_id' ),
235 'page_namespace' => $namespace,
236 'page_title IN (' . $this->mDb
->makeList( $dbkeys ) . ')',
237 'page_touched < ' . $this->mDb
->addQuotes( $now )
240 while ( $row = $this->mDb
->fetchObject( $res ) ) {
241 $ids[] = $row->page_id
;
243 if ( !count( $ids ) ) {
249 * We still need the page_touched condition, in case the row has changed since
250 * the non-locking select above.
252 $this->mDb
->update( 'page', array( 'page_touched' => $now ),
254 'page_id IN (' . $this->mDb
->makeList( $ids ) . ')',
255 'page_touched < ' . $this->mDb
->addQuotes( $now )
260 function invalidateCategories( $cats ) {
261 $this->invalidatePages( NS_CATEGORY
, array_keys( $cats ) );
265 * Update all the appropriate counts in the category table.
266 * @param $added associative array of category name => sort key
267 * @param $deleted associative array of category name => sort key
269 function updateCategoryCounts( $added, $deleted ) {
270 $a = new Article($this->mTitle
);
271 $a->updateCategoryCounts(
272 array_keys( $added ), array_keys( $deleted )
276 function invalidateImageDescriptions( $images ) {
277 $this->invalidatePages( NS_FILE
, array_keys( $images ) );
280 function dumbTableUpdate( $table, $insertions, $fromField ) {
281 $this->mDb
->delete( $table, array( $fromField => $this->mId
), __METHOD__
);
282 if ( count( $insertions ) ) {
283 # The link array was constructed without FOR UPDATE, so there may
284 # be collisions. This may cause minor link table inconsistencies,
285 # which is better than crippling the site with lock contention.
286 $this->mDb
->insert( $table, $insertions, __METHOD__
, array( 'IGNORE' ) );
291 * Make a WHERE clause from a 2-d NS/dbkey array
293 * @param array $arr 2-d array indexed by namespace and DB key
294 * @param string $prefix Field name prefix, without the underscore
296 function makeWhereFrom2d( &$arr, $prefix ) {
298 $lb->setArray( $arr );
299 return $lb->constructSet( $prefix, $this->mDb
);
303 * Update a table by doing a delete query then an insert query
306 function incrTableUpdate( $table, $prefix, $deletions, $insertions ) {
307 if ( $table == 'page_props' ) {
308 $fromField = 'pp_page';
310 $fromField = "{$prefix}_from";
312 $where = array( $fromField => $this->mId
);
313 if ( $table == 'pagelinks' ||
$table == 'templatelinks' ) {
314 $clause = $this->makeWhereFrom2d( $deletions, $prefix );
321 if ( $table == 'langlinks' ) {
322 $toField = 'll_lang';
323 } elseif ( $table == 'page_props' ) {
324 $toField = 'pp_propname';
326 $toField = $prefix . '_to';
328 if ( count( $deletions ) ) {
329 $where[] = "$toField IN (" . $this->mDb
->makeList( array_keys( $deletions ) ) . ')';
335 $this->mDb
->delete( $table, $where, __METHOD__
);
337 if ( count( $insertions ) ) {
338 $this->mDb
->insert( $table, $insertions, __METHOD__
, 'IGNORE' );
344 * Get an array of pagelinks insertions for passing to the DB
345 * Skips the titles specified by the 2-D array $existing
348 function getLinkInsertions( $existing = array() ) {
350 foreach( $this->mLinks
as $ns => $dbkeys ) {
351 # array_diff_key() was introduced in PHP 5.1, there is a compatibility function
352 # in GlobalFunctions.php
353 $diffs = isset( $existing[$ns] ) ?
array_diff_key( $dbkeys, $existing[$ns] ) : $dbkeys;
354 foreach ( $diffs as $dbk => $id ) {
356 'pl_from' => $this->mId
,
357 'pl_namespace' => $ns,
366 * Get an array of template insertions. Like getLinkInsertions()
369 function getTemplateInsertions( $existing = array() ) {
371 foreach( $this->mTemplates
as $ns => $dbkeys ) {
372 $diffs = isset( $existing[$ns] ) ?
array_diff_key( $dbkeys, $existing[$ns] ) : $dbkeys;
373 foreach ( $diffs as $dbk => $id ) {
375 'tl_from' => $this->mId
,
376 'tl_namespace' => $ns,
385 * Get an array of image insertions
386 * Skips the names specified in $existing
389 function getImageInsertions( $existing = array() ) {
391 $diffs = array_diff_key( $this->mImages
, $existing );
392 foreach( $diffs as $iname => $dummy ) {
394 'il_from' => $this->mId
,
402 * Get an array of externallinks insertions. Skips the names specified in $existing
405 function getExternalInsertions( $existing = array() ) {
407 $diffs = array_diff_key( $this->mExternals
, $existing );
408 foreach( $diffs as $url => $dummy ) {
410 'el_from' => $this->mId
,
412 'el_index' => wfMakeUrlIndex( $url ),
419 * Get an array of category insertions
420 * @param array $existing Array mapping existing category names to sort keys. If both
421 * match a link in $this, the link will be omitted from the output
424 function getCategoryInsertions( $existing = array() ) {
426 $diffs = array_diff_assoc( $this->mCategories
, $existing );
428 foreach ( $diffs as $name => $sortkey ) {
429 $nt = Title
::makeTitleSafe( NS_CATEGORY
, $name );
430 $wgContLang->findVariantLink( $name, $nt, true );
431 // for category redirection
432 if ( $nt->isRedirect() ) {
433 $at = new Article( $nt );
434 $nt = $at->getRedirectTarget();
435 // we only redirect a category to another category
436 if ( $nt->getNamespace() == NS_CATEGORY
)
437 $name = $nt->getText();
440 'cl_from' => $this->mId
,
442 'cl_sortkey' => $sortkey,
443 'cl_timestamp' => $this->mDb
->timestamp()
450 * Get an array of interlanguage link insertions
451 * @param array $existing Array mapping existing language codes to titles
454 function getInterlangInsertions( $existing = array() ) {
455 $diffs = array_diff_assoc( $this->mInterlangs
, $existing );
457 foreach( $diffs as $lang => $title ) {
459 'll_from' => $this->mId
,
468 * Get an array of page property insertions
470 function getPropertyInsertions( $existing = array() ) {
471 $diffs = array_diff_assoc( $this->mProperties
, $existing );
473 foreach ( $diffs as $name => $value ) {
475 'pp_page' => $this->mId
,
476 'pp_propname' => $name,
477 'pp_value' => $value,
485 * Given an array of existing links, returns those links which are not in $this
486 * and thus should be deleted.
489 function getLinkDeletions( $existing ) {
491 foreach ( $existing as $ns => $dbkeys ) {
492 if ( isset( $this->mLinks
[$ns] ) ) {
493 $del[$ns] = array_diff_key( $existing[$ns], $this->mLinks
[$ns] );
495 $del[$ns] = $existing[$ns];
502 * Given an array of existing templates, returns those templates which are not in $this
503 * and thus should be deleted.
506 function getTemplateDeletions( $existing ) {
508 foreach ( $existing as $ns => $dbkeys ) {
509 if ( isset( $this->mTemplates
[$ns] ) ) {
510 $del[$ns] = array_diff_key( $existing[$ns], $this->mTemplates
[$ns] );
512 $del[$ns] = $existing[$ns];
519 * Given an array of existing images, returns those images which are not in $this
520 * and thus should be deleted.
523 function getImageDeletions( $existing ) {
524 return array_diff_key( $existing, $this->mImages
);
528 * Given an array of existing external links, returns those links which are not
529 * in $this and thus should be deleted.
532 function getExternalDeletions( $existing ) {
533 return array_diff_key( $existing, $this->mExternals
);
537 * Given an array of existing categories, returns those categories which are not in $this
538 * and thus should be deleted.
541 function getCategoryDeletions( $existing ) {
542 return array_diff_assoc( $existing, $this->mCategories
);
546 * Given an array of existing interlanguage links, returns those links which are not
547 * in $this and thus should be deleted.
550 function getInterlangDeletions( $existing ) {
551 return array_diff_assoc( $existing, $this->mInterlangs
);
555 * Get array of properties which should be deleted.
558 function getPropertyDeletions( $existing ) {
559 return array_diff_assoc( $existing, $this->mProperties
);
563 * Get an array of existing links, as a 2-D array
566 function getExistingLinks() {
567 $res = $this->mDb
->select( 'pagelinks', array( 'pl_namespace', 'pl_title' ),
568 array( 'pl_from' => $this->mId
), __METHOD__
, $this->mOptions
);
570 while ( $row = $this->mDb
->fetchObject( $res ) ) {
571 if ( !isset( $arr[$row->pl_namespace
] ) ) {
572 $arr[$row->pl_namespace
] = array();
574 $arr[$row->pl_namespace
][$row->pl_title
] = 1;
576 $this->mDb
->freeResult( $res );
581 * Get an array of existing templates, as a 2-D array
584 function getExistingTemplates() {
585 $res = $this->mDb
->select( 'templatelinks', array( 'tl_namespace', 'tl_title' ),
586 array( 'tl_from' => $this->mId
), __METHOD__
, $this->mOptions
);
588 while ( $row = $this->mDb
->fetchObject( $res ) ) {
589 if ( !isset( $arr[$row->tl_namespace
] ) ) {
590 $arr[$row->tl_namespace
] = array();
592 $arr[$row->tl_namespace
][$row->tl_title
] = 1;
594 $this->mDb
->freeResult( $res );
599 * Get an array of existing images, image names in the keys
602 function getExistingImages() {
603 $res = $this->mDb
->select( 'imagelinks', array( 'il_to' ),
604 array( 'il_from' => $this->mId
), __METHOD__
, $this->mOptions
);
606 while ( $row = $this->mDb
->fetchObject( $res ) ) {
607 $arr[$row->il_to
] = 1;
609 $this->mDb
->freeResult( $res );
614 * Get an array of existing external links, URLs in the keys
617 function getExistingExternals() {
618 $res = $this->mDb
->select( 'externallinks', array( 'el_to' ),
619 array( 'el_from' => $this->mId
), __METHOD__
, $this->mOptions
);
621 while ( $row = $this->mDb
->fetchObject( $res ) ) {
622 $arr[$row->el_to
] = 1;
624 $this->mDb
->freeResult( $res );
629 * Get an array of existing categories, with the name in the key and sort key in the value.
632 function getExistingCategories() {
633 $res = $this->mDb
->select( 'categorylinks', array( 'cl_to', 'cl_sortkey' ),
634 array( 'cl_from' => $this->mId
), __METHOD__
, $this->mOptions
);
636 while ( $row = $this->mDb
->fetchObject( $res ) ) {
637 $arr[$row->cl_to
] = $row->cl_sortkey
;
639 $this->mDb
->freeResult( $res );
644 * Get an array of existing interlanguage links, with the language code in the key and the
645 * title in the value.
648 function getExistingInterlangs() {
649 $res = $this->mDb
->select( 'langlinks', array( 'll_lang', 'll_title' ),
650 array( 'll_from' => $this->mId
), __METHOD__
, $this->mOptions
);
652 while ( $row = $this->mDb
->fetchObject( $res ) ) {
653 $arr[$row->ll_lang
] = $row->ll_title
;
659 * Get an array of existing categories, with the name in the key and sort key in the value.
662 function getExistingProperties() {
663 $res = $this->mDb
->select( 'page_props', array( 'pp_propname', 'pp_value' ),
664 array( 'pp_page' => $this->mId
), __METHOD__
, $this->mOptions
);
666 while ( $row = $this->mDb
->fetchObject( $res ) ) {
667 $arr[$row->pp_propname
] = $row->pp_value
;
669 $this->mDb
->freeResult( $res );
675 * Return the title object of the page being updated
677 function getTitle() {
678 return $this->mTitle
;
682 * Invalidate any necessary link lists related to page property changes
684 function invalidateProperties( $changed ) {
685 global $wgPagePropLinkInvalidations;
687 foreach ( $changed as $name => $value ) {
688 if ( isset( $wgPagePropLinkInvalidations[$name] ) ) {
689 $inv = $wgPagePropLinkInvalidations[$name];
690 if ( !is_array( $inv ) ) {
691 $inv = array( $inv );
693 foreach ( $inv as $table ) {
694 $update = new HTMLCacheUpdate( $this->mTitle
, $table );