MessageList.php

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<?php
namespace Magento\Framework\Notification;

class MessageList
{
    protected $_messageClasses;

    protected $_messages;

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager, $messages = [])
    {
        $this->_objectManager = $objectManager;
        $this->_messageClasses = $messages;
    }

    protected function _loadMessages()
    {
        if (!empty($this->_messages)) {
            return;
        }
        foreach ($this->_messageClasses as $key => $messageClass) {
            if (!$messageClass) {
                throw new \InvalidArgumentException('Message class for message "' . $key . '" is not set');
            }
            $message = $this->_objectManager->get($messageClass);
            if ($message instanceof \Magento\Framework\Notification\MessageInterface) {
                $this->_messages[$message->getIdentity()] = $message;
            } else {
                throw new \UnexpectedValueException("Message class has to implement the message interface.");
            }
        }
    }

    public function getMessageByIdentity($identity)
    {
        $this->_loadMessages();
        return $this->_messages[$identity] ?? null;
    }

    public function asArray()
    {
        $this->_loadMessages();
        return $this->_messages;
    }
}