Meta.php

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<?php
namespace Magento\SalesSequence\Model\ResourceModel;

use Magento\Framework\Exception\LocalizedException as Exception;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\Model\ResourceModel\Db\Context as DatabaseContext;
use Magento\SalesSequence\Model\ResourceModel\Profile as ResourceProfile;
use Magento\SalesSequence\Model\MetaFactory;
use Magento\SalesSequence\Model\Profile as ModelProfile;

class Meta extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    protected $_eventPrefix = 'sales_sequence_meta';

    protected $resourceProfile;

    protected $metaFactory;

    public function __construct(
        DatabaseContext $context,
        MetaFactory $metaFactory,
        ResourceProfile $resourceProfile,
        $connectionName = null
    ) {
        $this->metaFactory = $metaFactory;
        $this->resourceProfile = $resourceProfile;
        parent::__construct($context, $connectionName);
    }

    protected function _construct()
    {
        $this->_init('sales_sequence_meta', 'meta_id');
    }

    public function loadByEntityTypeAndStore($entityType, $storeId)
    {
        $meta = $this->metaFactory->create();
        $connection = $this->getConnection();
        $bind = ['entity_type' => $entityType, 'store_id' => $storeId];
        $select = $connection->select()->from(
            $this->getMainTable(),
            [$this->getIdFieldName()]
        )->where(
            'entity_type = :entity_type AND store_id = :store_id'
        );
        $metaId = $connection->fetchOne($select, $bind);

        if ($metaId) {
            $this->load($meta, $metaId);
        }
        return $meta;
    }

    protected function _afterLoad(\Magento\Framework\Model\AbstractModel $object)
    {
        $object->setData(
            'active_profile',
            $this->resourceProfile->loadActiveProfile($object->getId())
        );
        return $this;
    }

    protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
    {
        if (!$object->getData('active_profile') instanceof ModelProfile) {
            throw new NoSuchEntityException(
                __(
                    "The entity sequence profile wasn't added to the meta active profile. "
                    . "Verify the profile and try again."
                )
            );
        }

        if (!$object->getData('entity_type')
            || $object->getData('store_id') === null
            || !$object->getData('sequence_table')
        ) {
            throw new Exception(__('Not enough arguments'));
        }

        return $this;
    }

    protected function _afterSave(\Magento\Framework\Model\AbstractModel $object)
    {
        $profile = $object->getData('active_profile')
            ->setMetaId($object->getId());
        $this->resourceProfile->save($profile);
        return $this;
    }
}