nineinchnick\nfy\components\MailQueue::init PHP Метод

    public function init()
    {
        parent::init();
        if ($this->blocking) {
            throw new NotSupportedException(Yii::t('app', 'MailQueue does not support blocking.'));
        }
        $this->subscriptionQueue = Instance::ensure($this->subscriptionQueue, 'nineinchnick\\nfy\\components\\QueueInterface');
        $this->mailer = Instance::ensure($this->mailer, 'yii\\mail\\MailerInterface');
        if (!is_callable($this->recipientCallback)) {
            throw new InvalidConfigException(Yii::t('app', 'MailQueue requires a valid callback for recipientCallback.'));
        }
        if ($this->composeCallback === null) {
            $this->composeCallback = [$this, 'createMessage'];
        }
    }