TransactionManager.php

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

use Magento\Framework\DB\Adapter\AdapterInterface as Connection;

class TransactionManager implements TransactionManagerInterface
{
    protected $participants;

    public function start(Connection $connection)
    {
        $this->participants[] = $connection;
        $connection->beginTransaction();
        return $connection;
    }

    public function commit()
    {
        while ($connection = array_pop($this->participants)) {
            $connection->commit();
        }
    }

    public function rollBack()
    {
        while ($connection = array_pop($this->participants)) {
            $connection->rollBack();
        }
    }

    protected function getConnectionKey(Connection $connection)
    {
        return spl_object_hash($connection);
    }
}