ReportSystemCacheFlush.php

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<?php
namespace Magento\NewRelicReporting\Model\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\NewRelicReporting\Model\Config;

class ReportSystemCacheFlush implements ObserverInterface
{
    protected $config;

    protected $systemFactory;

    protected $jsonEncoder;

    public function __construct(
        Config $config,
        \Magento\NewRelicReporting\Model\SystemFactory $systemFactory,
        \Magento\Framework\Json\EncoderInterface $jsonEncoder
    ) {
        $this->config = $config;
        $this->systemFactory = $systemFactory;
        $this->jsonEncoder = $jsonEncoder;
    }

    public function execute(Observer $observer)
    {
        if ($this->config->isNewRelicEnabled()) {
            $jsonData = ['status' => 'updated'];

            $modelData = [
                'type' => Config::FLUSH_CACHE,
                'action' => $this->jsonEncoder->encode($jsonData)
            ];

            $systemModel = $this->systemFactory->create();
            $systemModel->setData($modelData);
            $systemModel->save();
        }
    }
}