Transaction.php

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<?php
namespace Magento\Framework\DB;

class Transaction
{
    protected $_objects = [];

    protected $_objectsByAlias = [];

    protected $_beforeCommitCallbacks = [];

    protected function _startTransaction()
    {
        foreach ($this->_objects as $object) {
            $object->getResource()->beginTransaction();
        }
        return $this;
    }

    protected function _commitTransaction()
    {
        foreach ($this->_objects as $object) {
            $object->getResource()->commit();
        }
        return $this;
    }

    protected function _rollbackTransaction()
    {
        foreach ($this->_objects as $object) {
            $object->getResource()->rollBack();
        }
        return $this;
    }

    protected function _runCallbacks()
    {
        foreach ($this->_beforeCommitCallbacks as $callback) {
            call_user_func($callback);
        }
        return $this;
    }

    public function addObject(\Magento\Framework\Model\AbstractModel $object, $alias = '')
    {
        $this->_objects[] = $object;
        if (!empty($alias)) {
            $this->_objectsByAlias[$alias] = $object;
        }
        return $this;
    }

    public function addCommitCallback($callback)
    {
        $this->_beforeCommitCallbacks[] = $callback;
        return $this;
    }

    public function save()
    {
        $this->_startTransaction();
        $error = false;

        try {
            foreach ($this->_objects as $object) {
                $object->save();
            }
        } catch (\Exception $e) {
            $error = $e;
        }

        if ($error === false) {
            try {
                $this->_runCallbacks();
            } catch (\Exception $e) {
                $error = $e;
            }
        }

        if ($error) {
            $this->_rollbackTransaction();
            throw $error;
        } else {
            $this->_commitTransaction();
        }

        return $this;
    }

    public function delete()
    {
        $this->_startTransaction();
        $error = false;

        try {
            foreach ($this->_objects as $object) {
                $object->delete();
            }
        } catch (\Exception $e) {
            $error = $e;
        }

        if ($error === false) {
            try {
                $this->_runCallbacks();
            } catch (\Exception $e) {
                $error = $e;
            }
        }

        if ($error) {
            $this->_rollbackTransaction();
            throw $error;
        } else {
            $this->_commitTransaction();
        }
        return $this;
    }
}