ProductDataProvider.php

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<?php
namespace Magento\Catalog\Ui\DataProvider\Product;

use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;
use Magento\Framework\App\ObjectManager;
use Magento\Ui\DataProvider\Modifier\ModifierInterface;
use Magento\Ui\DataProvider\Modifier\PoolInterface;

class ProductDataProvider extends \Magento\Ui\DataProvider\AbstractDataProvider
{
    protected $collection;

    protected $addFieldStrategies;

    protected $addFilterStrategies;

    private $modifiersPool;

    public function __construct(
        $name,
        $primaryFieldName,
        $requestFieldName,
        CollectionFactory $collectionFactory,
        array $addFieldStrategies = [],
        array $addFilterStrategies = [],
        array $meta = [],
        array $data = [],
        PoolInterface $modifiersPool = null
    ) {
        parent::__construct($name, $primaryFieldName, $requestFieldName, $meta, $data);
        $this->collection = $collectionFactory->create();
        $this->addFieldStrategies = $addFieldStrategies;
        $this->addFilterStrategies = $addFilterStrategies;
        $this->modifiersPool = $modifiersPool ?: ObjectManager::getInstance()->get(PoolInterface::class);
    }

    public function getData()
    {
        if (!$this->getCollection()->isLoaded()) {
            $this->getCollection()->load();
        }
        $items = $this->getCollection()->toArray();

        $data = [
            'totalRecords' => $this->getCollection()->getSize(),
            'items' => array_values($items),
        ];

        foreach ($this->modifiersPool->getModifiersInstances() as $modifier) {
            $data = $modifier->modifyData($data);
        }
        return $data;
    }

    public function addField($field, $alias = null)
    {
        if (isset($this->addFieldStrategies[$field])) {
            $this->addFieldStrategies[$field]->addField($this->getCollection(), $field, $alias);
        } else {
            parent::addField($field, $alias);
        }
    }

    public function addFilter(\Magento\Framework\Api\Filter $filter)
    {
        if (isset($this->addFilterStrategies[$filter->getField()])) {
            $this->addFilterStrategies[$filter->getField()]
                ->addFilter(
                    $this->getCollection(),
                    $filter->getField(),
                    [$filter->getConditionType() => $filter->getValue()]
                );
        } else {
            parent::addFilter($filter);
        }
    }

    public function getMeta()
    {
        $meta = parent::getMeta();

        foreach ($this->modifiersPool->getModifiersInstances() as $modifier) {
            $meta = $modifier->modifyMeta($meta);
        }

        return $meta;
    }
}