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<?php |
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namespace SG\Cache; |
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use SG\SemanticDataComparator; |
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use SG\PropertyRegistrationHelper; |
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use SMW\Store; |
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use SMW\SemanticData; |
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use SMW\DIWikiPage; |
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use SMW\DIProperty; |
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use Lingo\LingoParser; |
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use MediaWiki\Linker\LinkTarget; |
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/** |
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* @ingroup SG |
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* @ingroup SemanticGlossary |
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* |
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* @license GNU GPL v2+ |
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* @since 1.0 |
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* |
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* @author Stephan Gambke |
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* @author mwjames |
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*/ |
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class CacheInvalidator { |
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/** |
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* @var CacheInvalidator |
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*/ |
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private static $instance = null; |
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/** |
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* @var GlossaryCache |
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*/ |
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private $cache = null; |
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/** |
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* @since 1.0 |
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* |
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* @return CacheInvalidator |
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*/ |
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public static function getInstance() { |
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if ( self::$instance === null ) { |
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$instance = new self(); |
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$instance->setCache( new GlossaryCache() ); |
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self::$instance = $instance; |
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} |
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return self::$instance; |
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} |
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/** |
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* @since 1.0 |
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*/ |
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public static function clear() { |
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self::$instance = null; |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param GlossaryCache $glossaryCache |
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*/ |
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public function setCache( GlossaryCache $glossaryCache ) { |
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$this->glossaryCache = $glossaryCache; |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param Store $store |
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* @param SemanticData $semanticData |
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* |
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* @return boolean |
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*/ |
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public function invalidateCacheOnStoreUpdate( Store $store, SemanticData $semanticData = null ) { |
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if ( $semanticData === null ) { |
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return false; |
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} |
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$this->matchAllSubobjects( $store, $semanticData ); |
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if ( $this->hasSemanticDataDeviation( $store, $semanticData ) ) { |
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$this->purgeCache( $semanticData->getSubject() ); |
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LingoParser::purgeCache(); |
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} |
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return true; |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param Store $store |
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* @param DIWikiPage $subject |
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* @param boolean|true $purgeLingo |
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* |
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* @return boolean |
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*/ |
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public function invalidateCacheOnPageDelete( Store $store, DIWikiPage $subject, $purgeLingo = true ) { |
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$this->matchSubobjectsToSubject( $store, $subject ); |
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$this->purgeCache( $subject ); |
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if ( $purgeLingo ) { |
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LingoParser::purgeCache(); |
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} |
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return true; |
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} |
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/** |
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* @since 1.0 |
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* |
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* @param LinkTarget $title |
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* |
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* @return boolean |
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*/ |
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public function invalidateCacheOnPageMove( LinkTarget $title ) { |
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$this->purgeCache( DIWikiPage::newFromText( $title->getDBkey(), $title->getNamespace() )); |
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return true; |
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} |
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private function matchAllSubobjects( Store $store, SemanticData $semanticData ) { |
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$properties = $semanticData->getProperties(); |
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if ( array_key_exists( DIProperty::TYPE_SUBOBJECT, $properties ) ) { |
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foreach ( $semanticData->getPropertyValues( $properties[ DIProperty::TYPE_SUBOBJECT ] ) as $subobject ) { |
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$this->invalidateCacheOnStoreUpdate( |
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$store, |
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$semanticData->findSubSemanticData( $subobject->getSubobjectName() ), |
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false |
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); |
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} |
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} |
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} |
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private function matchSubobjectsToSubject( Store $store, DIWikiPage $subject ) { |
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$properties = $store->getProperties( $subject ); |
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if ( array_key_exists( DIProperty::TYPE_SUBOBJECT, $properties ) ) { |
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foreach ( $store->getPropertyValues( $subject, $properties[ DIProperty::TYPE_SUBOBJECT ] ) as $subobject ) { |
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$this->invalidateCacheOnPageDelete( |
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$store, |
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$subobject->getSubject(), |
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false |
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); |
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} |
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} |
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} |
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private function hasSemanticDataDeviation( Store $store, SemanticData $semanticData ) { |
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$dataComparator = new SemanticDataComparator( $store, $semanticData ); |
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return $dataComparator->compareForProperty( PropertyRegistrationHelper::SG_TERM ) || |
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$dataComparator->compareForProperty( PropertyRegistrationHelper::SG_DEFINITION ) || |
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$dataComparator->compareForProperty( PropertyRegistrationHelper::SG_LINK ) || |
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$dataComparator->compareForProperty( PropertyRegistrationHelper::SG_STYLE ); |
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} |
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private function purgeCache( DIWikiPage $subject ) { |
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$this->glossaryCache->getCache()->delete( |
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$this->glossaryCache->getKeyForSubject( $subject ) |
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); |
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return true; |
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} |
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} |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: