DataProviderInterface.php

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<?php
namespace Magento\Framework\Search\Dynamic;

use Magento\Framework\DB\Ddl\Table;
use Magento\Framework\Search\Dynamic\EntityStorage;
use Magento\Framework\Search\Request\BucketInterface;

interface DataProviderInterface
{
    public function getRange();

    public function getAggregations(EntityStorage $entityStorage);

    public function getInterval(
        BucketInterface $bucket,
        array $dimensions,
        EntityStorage $entityStorage
    );

    public function getAggregation(
        BucketInterface $bucket,
        array $dimensions,
        $range,
        EntityStorage $entityStorage
    );

    public function prepareData($range, array $dbRanges);
}