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<?php
namespace SMW\MediaWiki\Hooks;
use SMW\ApplicationFactory;
use SMW\DIWikiPage;
use SMW\EventHandler;
use SMW\MediaWiki\Jobs\UpdateDispatcherJob;
use SMW\SemanticData;
use SMW\Store;
use Title;
use Wikipage;
/**
* @see https://www.mediawiki.org/wiki/Manual:Hooks/ArticleDelete
*
* @license GNU GPL v2+
* @since 2.0
*
* @author mwjames
*/
class ArticleDelete extends HookHandler {
/**
* @var
*/
private $store;
/**
* @since 3.0
*
* @param Store $store
*/
public function __construct( Store $store ) {
$this->store = $store;
}
/**
* @since 2.0
*
* @param Wikipage $wikiPage
*
* @return true
*/
public function process( Wikipage $wikiPage ) {
$deferredCallableUpdate = ApplicationFactory::getInstance()->newDeferredCallableUpdate( function() use( $wikiPage ) {
$this->doDelete( $wikiPage->getTitle() );
} );
$deferredCallableUpdate->setOrigin( __METHOD__ );
$deferredCallableUpdate->pushUpdate();
return true;
}
/**
* @since 3.0
*
* @param Title $title
*/
public function doDelete( Title $title ) {
$applicationFactory = ApplicationFactory::getInstance();
$subject = DIWikiPage::newFromTitle( $title );
$semanticDataSerializer = $applicationFactory->newSerializerFactory()->newSemanticDataSerializer();
$jobFactory = $applicationFactory->newJobFactory();
// Instead of Store::getSemanticData, construct the SemanticData by
// attaching only the incoming properties indicating which entities
// carry an actual reference to this subject
$semanticData = new SemanticData(
$subject
);
$properties = $this->store->getInProperties( $subject );
foreach ( $properties as $property ) {
// Avoid doing $propertySubjects = $store->getPropertySubjects( $property, $subject );
// as it may produce a too large pool of entities and ultimately
// block the delete transaction
// Use the subject as dataItem with the UpdateDispatcherJob because
// Store::getAllPropertySubjects is only scanning the property
$semanticData->addPropertyObjectValue( $property, $subject );
}
$parameters['semanticData'] = $semanticDataSerializer->serialize(
$semanticData
);
$parameters['origin'] = 'ArticleDelete';
// Fetch the ID before the delete process marks it as outdated to help
// run a dispatch process on secondary tables
$parameters['_id'] = $this->store->getObjectIds()->getId(
$subject
);
// Restricted to the available SemanticData
$parameters[UpdateDispatcherJob::RESTRICTED_DISPATCH_POOL] = true;
$updateDispatcherJob = $jobFactory->newUpdateDispatcherJob( $title, $parameters );
$updateDispatcherJob->insert();
$parserCachePurgeJob = $jobFactory->newParserCachePurgeJob(
$title,
[
'idlist' => [
$parameters['_id']
],
'origin' => 'ArticleDelete',
// Insert will only be done for when the links store is active
// otherwise the job wouldn't have any work to do
'is.enabled' => $this->getOption( 'smwgEnabledQueryDependencyLinksStore' )
]
);
$parserCachePurgeJob->insert();
$this->store->deleteSubject( $title );
$eventHandler = EventHandler::getInstance();
$dispatchContext = $eventHandler->newDispatchContext();
$dispatchContext->set( 'title', $title );
$dispatchContext->set( 'subject', $subject );
$dispatchContext->set( 'context', 'ArticleDelete' );
$eventHandler->getEventDispatcher()->dispatch(
'cached.prefetcher.reset',
$dispatchContext
);
// Removes any related update marker
$eventHandler->getEventDispatcher()->dispatch(
'cached.update.marker.delete',
$dispatchContext
);
}
}
|
