MetadataPool.php

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<?php
namespace Magento\Framework\EntityManager;

use Magento\Framework\EntityManager\Sequence\SequenceFactory;
use Magento\Framework\ObjectManagerInterface;

class MetadataPool
{
    protected $objectManager;

    protected $metadata;

    protected $registry;

    protected $sequenceFactory;

    public function __construct(
        ObjectManagerInterface $objectManager,
        SequenceFactory $sequenceFactory,
        array $metadata
    ) {
        $this->objectManager = $objectManager;
        $this->sequenceFactory = $sequenceFactory;
        $this->metadata = $metadata;
    }

    private function createMetadata($entityType)
    {
        //@todo: use ID as default if , check is type has EAV attributes
        $connectionName = isset($this->metadata[$entityType]['connectionName'])
            ? $this->metadata[$entityType]['connectionName']
            : 'default';
        $eavEntityType = isset($this->metadata[$entityType]['eavEntityType'])
            ? $this->metadata[$entityType]['eavEntityType']
            : null;
        $entityContext = isset($this->metadata[$entityType]['entityContext'])
            ? $this->metadata[$entityType]['entityContext']
            : [];
        return $this->objectManager->create(
            EntityMetadataInterface::class,
            [
                'entityTableName' => $this->metadata[$entityType]['entityTableName'],
                'eavEntityType' => $eavEntityType,
                'connectionName' => $connectionName,
                'identifierField' => $this->metadata[$entityType]['identifierField'],
                'sequence' => $this->sequenceFactory->create($entityType, $this->metadata),
                'entityContext' => $entityContext
            ]
        );
    }

    public function getMetadata($entityType)
    {
        if (!isset($this->metadata[$entityType])) {
            throw new \Exception(sprintf('Unknown entity type: %s requested', $entityType));
        }
        if (!isset($this->registry[$entityType])) {
            $this->registry[$entityType] = $this->createMetadata($entityType);
        }
        return $this->registry[$entityType];
    }

    public function getHydrator($entityType)
    {
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
        return $objectManager->get(HydratorPool::class)->getHydrator($entityType);
    }

    public function hasConfiguration($entityType)
    {
        return isset($this->metadata[$entityType]);
    }
}