Chat::getMessage

public function getMessage(int $messageId): ?Message
{
	if (isset($this->messageRegistry[$messageId]))
	{
		return $this->messageRegistry[$messageId];
	}

	$message = new Message;
	$message->setRegistry($this->messageRegistry);

	$loadResult = $message->load($messageId);
	if ($loadResult->isSuccess())
	{
		return $message;
	}

	return null;
}