CompositeProductBatchSizeAdjuster.php

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<?php
namespace Magento\Catalog\Model\ResourceModel\Product\Indexer\Price;

class CompositeProductBatchSizeAdjuster implements CompositeProductBatchSizeAdjusterInterface
{
    private $compositeProductRelationsCalculator;

    public function __construct(CompositeProductRelationsCalculator $compositeProductRelationsCalculator)
    {
        $this->compositeProductRelationsCalculator = $compositeProductRelationsCalculator;
    }

    public function adjust($batchSize)
    {
        $maxRelationsCount = $this->compositeProductRelationsCalculator->getMaxRelationsCount();
        return $maxRelationsCount > 0 ? ceil($batchSize / $maxRelationsCount) : $batchSize;
    }
}