StatePlugin.php

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<?php
declare(strict_types=1);

namespace Magento\NewRelicReporting\Plugin;

use Magento\Framework\App\State;
use Magento\Framework\Exception\LocalizedException;
use Magento\NewRelicReporting\Model\Config;
use Magento\NewRelicReporting\Model\NewRelicWrapper;
use Psr\Log\LoggerInterface;

class StatePlugin
{
    private $config;

    private $newRelicWrapper;

    private $logger;

    public function __construct(
        Config $config,
        NewRelicWrapper $newRelicWrapper,
        LoggerInterface $logger
    ) {
        $this->config = $config;
        $this->newRelicWrapper = $newRelicWrapper;
        $this->logger = $logger;
    }

    public function afterSetAreaCode(State $subject, $result)
    {
        if (!$this->shouldSetAppName()) {
            return $result;
        }

        try {
            $this->newRelicWrapper->setAppName($this->appName($subject));
        } catch (LocalizedException $e) {
            $this->logger->critical($e);
            return $result;
        }

        return $result;
    }

    private function appName(State $state): string
    {
        $code = $state->getAreaCode();
        $current = $this->config->getNewRelicAppName();

        return $current . ';' . $current . '_' . $code;
    }

    private function shouldSetAppName(): bool
    {
        return (
            $this->config->isSeparateApps() &&
            $this->config->getNewRelicAppName() &&
            $this->config->isNewRelicEnabled()
        );
    }
}