🚀 Maximizing Efficiency with Singleton Design Pattern in Symfony

Hey, Developers community! 👋 Today, I want to share with you a practical example of how the Singleton design pattern can be a game-changer in Symfony applications. Let’s dive into a real-world scenario using Symfony’s ValidationReportingService.

🧐 The Challenge

In complex Symfony applications, managing database-related operations efficiently is crucial. We need a centralized service that validates and retrieves information related to database tables. Enter the ValidationReportingService with the power of the Singleton pattern.

🌐 The Singleton Setup

The ValidationReportingService class employs the Singleton pattern to ensure there's only one instance throughout the application's lifecycle. This is achieved through a private static instance and a getInstance method.

ValidationReportingService class

// Extract from ValidationReportingService class

class ValidationReportingService
{
    private static $instance;

    // Constructor and other methods...

    public static function getInstance(Connection $connection): self
    {
        if (self::$instance === null) {
            self::$instance = new self($connection);
        }

        return self::$instance;
    }

   public function validateReport(ReportingDTO $reportingDTO): bool
    {
        
        $query=$this->reportService->generateFinalQuery($reportingDTO);
        
        if($this->validateOrder($this->reportService->setupFromTables($reportingDTO->getFor())))
        {
            if(is_array($query->fetchAllAssociative()))
            {
                return true;
            }else{
                return  false ;
            }
        }else{
            return false;
        }

    }
}

🚀 Singleton in Action

The ValidationReportingService instance is created and used within a Symfony controller. Here's a snippet from the controller:

// Extract from the controller

$validator = ValidationReportingService::getInstance($this->repository->getConnection());

if ($validator->validateReport($reportDto)) {
    // Valid report, save it in the database
    $this->repository->save($report, true);
    return $this->redirectToRoute('route');
} else {
    // Invalid report, handle the error
    $response = $this->requestStack->getCurrentRequest();
    $response->getSession()->getFlashBag()->add('error', $this->translator->trans('reporting.errors.orderInvalid'));

    return new RedirectResponse($this->generateUrl('route'));
}

💪 Benefits of Singleton

1. Resource Efficiency: The Singleton pattern ensures that only one instance is created, reducing resource consumption.
2. Global Access: The instance is globally accessible, promoting a centralized and standardized approach.
3. Lazy Loading: The instance is created on-demand, enhancing performance by avoiding unnecessary early instantiation.

🌟 Conclusion

Implementing the Singleton pattern in Symfony, as shown in the ValidationReportingService, can significantly enhance the efficiency and maintainability of your application. Centralized services are key to achieving scalable and robust Symfony applications.

Feel free to check out the full code example on GitHub and let me know your thoughts! 💬 Happy coding! 🚀