NotifierList.php

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<?php
namespace Magento\Framework\Notification;

class NotifierList
{
    protected $objectManager;

    protected $notifiers;

    protected $isNotifiersVerified;

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager, $notifiers = [])
    {
        $this->objectManager = $objectManager;
        $this->notifiers = $notifiers;
        $this->isNotifiersVerified = false;
    }

    public function asArray()
    {
        if (!$this->isNotifiersVerified) {
            $hasErrors = false;
            foreach ($this->notifiers as $classIndex => $class) {
                $notifier = $this->objectManager->get($class);
                if ($notifier instanceof NotifierInterface) {
                    $this->notifiers[$classIndex] = $notifier;
                } else {
                    $hasErrors = true;
                    unset($this->notifiers[$classIndex]);
                }
            }
            $this->isNotifiersVerified = true;
            if ($hasErrors) {
                throw new \InvalidArgumentException('All notifiers should implement NotifierInterface');
            }
        }
        return $this->notifiers;
    }
}