SourceSelectionService.php

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<?php
declare(strict_types=1);

namespace Magento\InventorySourceSelection\Model;

use Magento\Framework\ObjectManagerInterface;
use Magento\InventorySourceSelectionApi\Api\Data\InventoryRequestInterface;
use Magento\InventorySourceSelectionApi\Api\Data\SourceSelectionResultInterface;
use Magento\InventorySourceSelectionApi\Api\SourceSelectionServiceInterface;
use Magento\InventorySourceSelectionApi\Model\SourceSelectionInterface;

class SourceSelectionService implements SourceSelectionServiceInterface
{
    private $objectManager;

    private $sourceSelectionMethods;

    public function __construct(
        ObjectManagerInterface $objectManager,
        array $sourceSelectionMethods = []
    ) {
        $this->objectManager = $objectManager;
        $this->sourceSelectionMethods = $sourceSelectionMethods;
    }

    public function execute(
        InventoryRequestInterface $inventoryRequest,
        string $algorithmCode
    ): SourceSelectionResultInterface {
        if (!isset($this->sourceSelectionMethods[$algorithmCode])) {
            throw new \LogicException(
                __('There is no such Source Selection Algorithm implemented: %1', $algorithmCode)
            );
        }
        $sourceSelectionClassName = $this->sourceSelectionMethods[$algorithmCode];

        $sourceSelectionAlgorithm = $this->objectManager->create($sourceSelectionClassName);
        if (false === $sourceSelectionAlgorithm instanceof SourceSelectionInterface) {
            throw new \LogicException(
                __('%1 doesn\'t implement SourceSelectionInterface', $sourceSelectionClassName)
            );
        }
        return $sourceSelectionAlgorithm->execute($inventoryRequest);
    }
}