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<?php |
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/******************************************************************************* |
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* This file is part of the GraphQL Bundle package. |
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* |
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* (c) YnloUltratech <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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******************************************************************************/ |
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namespace Ynlo\GraphQLBundle\Resolver; |
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use Doctrine\Bundle\DoctrineBundle\Registry; |
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use Doctrine\Common\Util\ClassUtils; |
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use Doctrine\ORM\EntityRepository; |
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use Ynlo\GraphQLBundle\Model\NodeInterface; |
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/** |
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* This buffer is used to solve the N+1 Problem |
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* |
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* @see https://secure.phabricator.com/book/phabcontrib/article/n_plus_one/ |
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* |
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* Create a array of pending relations to load and create a only one |
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* IN(...) query for all entities of the same type |
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*/ |
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class DeferredBuffer |
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{ |
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/** |
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* @var Registry |
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*/ |
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protected $registry; |
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/** |
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* @var array[] |
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*/ |
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private static $deferred = []; |
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/** |
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* @var bool |
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*/ |
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private static $loaded = false; |
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/** |
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* DeferredBuffer constructor. |
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* |
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* @param Registry $registry |
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*/ |
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public function __construct(Registry $registry) |
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{ |
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$this->registry = $registry; |
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} |
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/** |
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* @param NodeInterface $entity |
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*/ |
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public function add(NodeInterface $entity) |
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{ |
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$class = ClassUtils::getClass($entity); |
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self::$deferred[$class][$entity->getId()] = $entity->getId(); |
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} |
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/** |
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* Return the loaded entity for given not initialized entity |
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* |
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* @param NodeInterface $entity |
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* |
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* @return NodeInterface |
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*/ |
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public function getLoadedEntity(NodeInterface $entity): NodeInterface |
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{ |
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$class = ClassUtils::getClass($entity); |
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if (isset(self::$deferred[$class][$entity->getId()]) && self::$deferred[$class][$entity->getId()] instanceof NodeInterface) { |
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return self::$deferred[$class][$entity->getId()]; |
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} |
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//fallback |
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return $entity; |
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} |
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/** |
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* Load buffer of entities |
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*/ |
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public function loadBuffer() |
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{ |
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if (self::$loaded) { |
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return; |
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} |
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self::$loaded = true; |
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foreach (self::$deferred as $class => $ids) { |
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/** @var EntityRepository $repo */ |
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$repo = $this->registry->getRepository($class); |
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$qb = $repo->createQueryBuilder('o', 'o.id'); |
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$entities = $qb->where($qb->expr()->in('o.id', $ids)) |
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->getQuery() |
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->getResult(); |
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self::$deferred[$class] = $entities; |
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} |
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} |
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} |
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ynloultratech /
graphql-bundle
