EventManager.php

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<?php
namespace Magento\Framework\EntityManager;

use Magento\Framework\Event\ManagerInterface;

class EventManager
{
    private $eventManager;

    public function __construct(
        ManagerInterface $eventManager
    ) {
        $this->eventManager = $eventManager;
    }

    private function resolveEntityPrefix($entityType)
    {
        return strtolower(str_replace("\\", "_", $entityType));
    }

    public function dispatchEntityEvent($entityType, $eventSuffix, array $data = [])
    {
        $this->eventManager->dispatch(
            $this->resolveEntityPrefix($entityType) . '_' . $eventSuffix,
            $data
        );
    }

    public function dispatch($eventName, array $data = [])
    {
        $this->eventManager->dispatch($eventName, $data);
    }
}