Controller/Adminhtml/Ajax/AbstractAjax.php

<?php
/**
 * Copyright (c) Meta Platforms, Inc. and affiliates. All Rights Reserved
 */

namespace Facebook\BusinessExtension\Controller\Adminhtml\Ajax;

use Magento\Security\Model\AdminSessionsManager;

abstract class AbstractAjax extends \Magento\Backend\App\Action
{
  /**
   * @var \Magento\Framework\Controller\Result\JsonFactory
   */
    protected $_resultJsonFactory;

    protected $_fbeHelper;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory,
        \Facebook\BusinessExtension\Helper\FBEHelper $fbeHelper
    ) {
        parent::__construct($context);
        $this->_resultJsonFactory = $resultJsonFactory;
        $this->_fbeHelper = $fbeHelper;
    }

    abstract protected function executeForJson();

    public function execute()
    {
        $result = $this->_resultJsonFactory->create();
      // TODO : Move all String objects to constants.
        $admin_session = $this->_fbeHelper
        ->createObject(AdminSessionsManager::class)
        ->getCurrentSession();
        if (!$admin_session && $admin_session->getStatus() != 1) {
            throw new \Exception('Oops, this endpoint is for logged in admin and ajax only!');
        } else {
            try {
                $json = $this->executeForJson();
                return $result->setData($json);
            } catch (\Exception $e) {
              // Uncomment once the logger is added
              // $this->_fbeHelper->logException($e);
                throw new Exception(
                    'Oops, there was error while processing your request.' .
                    ' Please contact admin for more details.'
                );
            }
        }
    }
}