RelationComposite.php

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<?php
namespace Magento\Framework\Model\ResourceModel\Db\VersionControl;

use Magento\Framework\Model\AbstractModel;
use Magento\Framework\Event\ManagerInterface as EventManager;

class RelationComposite
{
    protected $relationProcessors;

    protected $eventManager;

    public function __construct(
        EventManager $eventManager,
        array $relationProcessors = []
    ) {
        $this->eventManager = $eventManager;
        $this->relationProcessors = $relationProcessors;
    }

    public function processRelations(AbstractModel $object)
    {
        foreach ($this->relationProcessors as $processor) {
            $processor->processRelation($object);
        }
        $this->eventManager->dispatch(
            $object->getEventPrefix(). '_process_relation',
            [
                'object' => $object
            ]
        );
    }
}