IntegrationConfig.php

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<?php
namespace Magento\Integration\Model;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Serialize\SerializerInterface;
use Magento\Integration\Model\Cache\TypeIntegration;
use Magento\Integration\Model\Config\Integration\Reader;

class IntegrationConfig
{
    const CACHE_ID = 'integration-api';

    protected $_configCacheType;

    protected $_configReader;

    protected $_integrations;

    private $serializer;

    public function __construct(
        TypeIntegration $configCacheType,
        Reader $configReader,
        SerializerInterface $serializer = null
    ) {
        $this->_configCacheType = $configCacheType;
        $this->_configReader = $configReader;
        $this->serializer = $serializer ?: ObjectManager::getInstance()->get(SerializerInterface::class);
    }

    public function getIntegrations()
    {
        if (null === $this->_integrations) {
            $integrations = $this->_configCacheType->load(self::CACHE_ID);
            if ($integrations && is_string($integrations)) {
                $this->_integrations = $this->serializer->unserialize($integrations);
            } else {
                $this->_integrations = $this->_configReader->read();
                $this->_configCacheType->save(
                    $this->serializer->serialize($this->_integrations),
                    self::CACHE_ID,
                    [TypeIntegration::CACHE_TAG]
                );
            }
        }
        return $this->_integrations;
    }
}