Subscriber.php

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<?php
namespace Magento\Newsletter\Block\Adminhtml;

use Magento\Newsletter\Model\ResourceModel\Queue\Collection;

class Subscriber extends \Magento\Backend\Block\Template
{
    protected $_queueCollection = null;

    protected $_template = 'Magento_Newsletter::subscriber/list.phtml';

    protected $_collectionFactory;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Newsletter\Model\ResourceModel\Queue\CollectionFactory $collectionFactory,
        array $data = []
    ) {
        $this->_collectionFactory = $collectionFactory;
        parent::__construct($context, $data);
    }

    protected function _beforeToHtml()
    {
        return parent::_beforeToHtml();
    }

    public function getQueueCollection()
    {
        if ($this->_queueCollection === null) {
            $this->_queueCollection = $this
                ->_collectionFactory
                ->create()
                ->addTemplateInfo()
                ->addOnlyUnsentFilter()
                ->load();
        }

        return $this->_queueCollection;
    }

    public function getShowQueueAdd()
    {
        return $this->getChildBlock('grid')->getShowQueueAdd();
    }

    public function getQueueAsOptions()
    {
        return $this->getQueueCollection()->toOptionArray();
    }
}