AbstractNotifier.php

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<?php
namespace Magento\Sales\Model;

use Psr\Log\LoggerInterface as Logger;
use Magento\Sales\Model\Order\Email\Sender;
use Magento\Sales\Model\ResourceModel\Order\Status\History\CollectionFactory;

abstract class AbstractNotifier extends \Magento\Framework\Model\AbstractModel
{
    protected $historyCollectionFactory;

    protected $logger;

    protected $sender;

    public function __construct(
        CollectionFactory $historyCollectionFactory,
        Logger $logger,
        Sender $sender
    ) {
        $this->historyCollectionFactory = $historyCollectionFactory;
        $this->logger = $logger;
        $this->sender = $sender;
    }

    public function notify(\Magento\Sales\Model\AbstractModel $model)
    {
        try {
            $this->sender->send($model);
            if (!$model->getEmailSent()) {
                return false;
            }
            $historyItem = $this->historyCollectionFactory->create()
                ->getUnnotifiedForInstance($model);
            if ($historyItem) {
                $historyItem->setIsCustomerNotified(1);
                $historyItem->save();
            }
        } catch (\Magento\Framework\Exception\MailException $e) {
            $this->logger->critical($e);
            return false;
        }
        return true;
    }
}