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<?php
namespace SMW;
use Onoi\BlobStore\BlobStore;
use SMWQuery as Query;
/**
* This class should be accessed via ApplicationFactory::getCachedPropertyValuesPrefetcher
* to ensure a singleton instance.
*
* The purpose of this class is to give fragmented access to frequent (hence
* cacheable) property values to ensure that the store is only used for when a
* match can not be found and so freeing up the capacities that can equally be
* served from a persistent cache instance.
*
* It is expected that as soon as the "on.before.semanticdata.update.complete"
* event has been emitted that matchable cache entries are purged for the
* subject in question.
*
* @license GNU GPL v2+
* @since 2.4
*
* @author mwjames
*/
class CachedPropertyValuesPrefetcher {
/**
* @var string
*/
const VERSION = '0.4.1';
/**
* Namespace occupied by the BlobStore
*/
const CACHE_NAMESPACE = 'smw:pvp:store';
/**
* @var Store
*/
private $store;
/**
* @var BlobStore
*/
private $blobStore;
/**
* @var boolean
*/
private $disableCache = false;
/**
* @since 2.4
*
* @param Store $store
* @param BlobStore $blobStore
*/
public function __construct( Store $store, BlobStore $blobStore ) {
$this->store = $store;
$this->blobStore = $blobStore;
}
/**
* @since 2.4
*/
public function resetCacheBy( DIWikiPage $subject ) {
$this->blobStore->delete( $this->getRootHashFrom( $subject ) );
}
/**
* @since 3.0
*
* @param boolean $disableCache
*/
public function disableCache( $disableCache ) {
$this->disableCache = (bool)$disableCache;
}
/**
* @since 2.4
*
* @param DIWikiPage $subject
* @param DIProperty $property
* @param RequestOptions|null $requestOptions
*
* @return array
*/
public function getPropertyValues( DIWikiPage $subject, DIProperty $property, RequestOptions $requestOptions = null ) {
// Items are collected as part of the subject hash so that any request is
// stored with that entity identifier allowing it to be evicted entirely
// when the subject is changed.
//
// The key on the other hand represent an individual request identifier
// that is stored as part of the overall cache item but making distinct
// requests possible, yet is fetched as part of the overall subject to
// minimize cache fragmentation and a better eviction strategy.
$key = $property->getKey() .
':' . $subject->getSubobjectName() .
':' . ( $requestOptions !== null ? md5( $requestOptions->getHash() ) : null );
$container = $this->blobStore->read(
$this->getRootHashFrom( $subject )
);
if ( $this->disableCache === false && $container->has( $key ) ) {
return $container->get( $key );
}
$dataItems = $this->store->getPropertyValues(
$subject,
$property,
$requestOptions
);
$container->set( $key, $dataItems );
$this->blobStore->save(
$container
);
return $dataItems;
}
/**
* @since 2.4
*
* @param Query $query
*
* @return array
*/
public function queryPropertyValuesFor( Query $query ) {
return $this->store->getQueryResult( $query )->getResults();
}
/**
* @since 2.4
*
* @return BlobStore
*/
public function getBlobStore() {
return $this->blobStore;
}
/**
* @since 2.4
*
* @return Store
*/
public function getStore() {
return $this->store;
}
/**
* @since 2.4
*
* @param DIWikiPage $subject
*
* @return string
*/
public function getRootHashFrom( DIWikiPage $subject ) {
return md5( $subject->asBase()->getHash() . self::VERSION );
}
/**
* @since 2.4
*
* @param string $hash
*
* @return string
*/
public function createHashFromString( $hash ) {
return md5( $hash . self::VERSION );
}
}
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