Sida loo yaqaan 'Cron job runs on only one server', waxaa loo yaqaan 'Cron job runs on only one server', ama waxaa loo yaqaan 'Cron job runs on only one server', waxaa loo yaqaan 'Cron job runs on only one server', ama waxaa loo yaqaan 'Cron job runs on only one server', waxaa loo yaqaan 'Cron job runs on only one server'. Waxay ku yaqaan First Line of Defense. Symfony Lock Component Sida loo yaqaan 'Liberty of Marka aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan yahay. PHP 8.4 dhismaha. this article caddaan warbixinta best practices I use in production, si ay u isticmaali karaa app aad si ay u dhismaha iyo dhismaha-free. Symfony 7.4 DynamoDB Qalabka iyo Configuration Waayo, waxaa loo isticmaali karaa si ay u isticmaali karo. If you plan to use Redis (recommended for distributed systems), wax soo saarka waa in la soo saarka ama la Qalabka symfony/lock predis/predis ext-redis composer require symfony/lock
# If using Redis
composer require predis/predis
# If using the new DynamoDB store (Symfony 7.4+)
composer require symfony/amazon-dynamo-db-lock
 QEEBE Haku Waayo, waxaa loo yaabaa in aad .” A common mistake is using a single default store for everything. Waxaan ka soo xiriir Waayo, waxaa laga yaabaa in ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah. config/packages/lock.yaml lockers named lockers framework:
    lock:
        # Default store (good for single-server setups)
        enabled: true

        # Named lockers
        resources:
            # Critical business locks (Distributed)
            order_processing: '%env(REDIS_DSN)%'

            # CLI command locks (Local is usually fine)
            cron_jobs:
                - 'flock'

            # New in 7.4: DynamoDB for serverless architectures
            # This is commented out as it requires AWS credentials and the symfony/amazon-dynamo-db-lock package.
            # To use it, install the package and configure your AWS credentials.
            # invoice_generation:
            #     - 'dynamodb://default/lock_table'

            # For the attribute example, we'll just use redis.
            invoice_generation: '%env(REDIS_DSN)%'
 The Golden Rule: The Try-Finally Pattern (Luuqaha dhismaha ah ee dhismaha) Sida loo isticmaali karaa in ay ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah. Marka: Pattern Waayo, sidoo kale waxaa laga yaabaa in ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah. namespace App\Service;

use Psr\Log\LoggerInterface;
use Symfony\Component\DependencyInjection\Attribute\Target;
use Symfony\Component\Lock\LockFactory;

readonly class OrderProcessor
{
    public function __construct(
        #[Target('order_processing')]
        private LockFactory     $lockFactory,
        private LoggerInterface $logger,
    ) {}

    public function processOrder(int $orderId, bool $crash = false): void
    {
        // The resource name should be unique for each order.
        $lock = $this->lockFactory->createLock('order_' . $orderId, 30);

        $this->logger->info(sprintf('Attempting to acquire lock for order %d.', $orderId));

        if (!$lock->acquire()) {
            // Fail fast if another process is already handling this order.
            $this->logger->warning(sprintf('Order %d is already being processed.', $orderId));
            throw new \RuntimeException(sprintf('Order %d is already being processed.', $orderId));
        }

        $this->logger->info(sprintf('Lock acquired for order %d.', $orderId));

        try {
            // CRITICAL SECTION
            // This is where you would perform payment capture, inventory updates, etc.
            $this->logger->info(sprintf('Processing order %d. This will take a few seconds.', $orderId));
            sleep(5); // Simulate work

            if ($crash) {
                $this->logger->error(sprintf('Simulating a crash while processing order %d.', $orderId));
                throw new \Exception('Something went wrong! The payment gateway is down.');
            }

            $this->chargeUser($orderId);
            $this->logger->info(sprintf('Finished processing order %d.', $orderId));

        } finally {
            $this->logger->info(sprintf('Releasing lock for order %d.', $orderId));
            $lock->release();
        }
    }

    private function chargeUser(int $id): void
    {
        // In a real application, this would interact with a payment service.
        $this->logger->info(sprintf('Charging user for order %d.', $id));
        // ... payment logic
    }
}
 Sida loo yaqaan "Try Blocks" waxaa loo yaqaan "Try Blocks" ee loo yaqaan "Try Blocks". 
 
 
 
 Waayo, waxaa laga yaqaan Lock. Shuruudaha ugu horeysay ee laga yaqaan "Exception" (Crash!) Shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha ugu horeysay ee shuruudaha. Shirkadda adeegga Shuruudaha dhismaha ah ee shuruudaha ah waa shuruudaha dhismaha ah ee shuruudaha ah. +----------+--------------------------------------+---------------------------------------+-----------------------------------------------------------+
| Store    | Use Case                             | Pros                                  | Cons                                                      |
+----------+--------------------------------------+---------------------------------------+-----------------------------------------------------------+
| Flock    | Single-server cron jobs, local dev.  | Zero dependency, persistent on disk.  | Fails in Kubernetes/Docker Swarm (filesystems aren't shared). |
+----------+--------------------------------------+---------------------------------------+-----------------------------------------------------------+
| Redis    | Distributed apps, user requests,     | Extremely fast, supports TTL.         | Requires Redis. Volatile (locks lost if Redis             |
|          | API limits.                          |                                       | crashes without AOF).                                     |
+----------+--------------------------------------+---------------------------------------+-----------------------------------------------------------+
| Semaphore| Local high-performance IPC.          | Fastest for local processes.          | OS-dependent constraints. Hard to debug.                  |
+----------+--------------------------------------+---------------------------------------+-----------------------------------------------------------+
| DynamoDB | Serverless / AWS Lambda environments.| Highly available, no server management.| Higher latency than Redis (network roundtrip).            |
+----------+--------------------------------------+---------------------------------------+-----------------------------------------------------------+
 
 
 
 
 Go Local with Flock or Semaphore if you are running on a single machine and need maximum speed with minimum overhead. Go Distributed with Redis for most modern web applications, oo ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah. Go Cloud-Native with DynamoDB if you are building in a serverless environment whereining a persistent connection to a cache like Redis is inefficient. Sida loo isticmaalaa Kubernetes, sidoo kale loo isticmaalaa Flock ama Semaphore si loo isticmaalaa locks-level. Always use Redis, Memcached, or Database stores (PDO/DynamoDB). Locking Declarative iyo atributes In Symfony 7.4 + PHP 8.x, sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale sidoo kale. Sida loo isticmaali karaa, waxaan sidoo kale loo isticmaali karaa this is a “Senior Developer” pattern that keeps your domain logic clean. LockFactory #[Lock] Qalabka Qalabka Qalabka namespace App\Attribute;

use Attribute;

#[Attribute(Attribute::TARGET_METHOD)]
final class Lock
{
    public function __construct(
        public string $resourceName,
        public int $ttl = 30,
        public bool $blocking = false
    ) {}
}
 Waayo, waxaa loo yaqaan 'Event Listener'. Waxaan loo isticmaali karaa wax soo saarka kernel si ay u iibsaday wax soo saarka ka dib markii controller si ay u iibsaday. namespace App\EventListener;

use App\Attribute\Lock;
use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
use Symfony\Component\HttpKernel\Event\ControllerEvent;
use Symfony\Component\HttpKernel\Event\TerminateEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\Lock\LockFactory;
use Symfony\Component\Lock\LockInterface;
use Symfony\Component\HttpKernel\Exception\TooManyRequestsHttpException;
use Psr\Log\LoggerInterface;
use Symfony\Component\DependencyInjection\Attribute\Target;

class LockAttributeListener
{
    private \WeakMap $locks;

    public function __construct(
        #[Target('invoice_generation')]
        private readonly LockFactory $lockFactory,
        private readonly LoggerInterface $logger,
    ) {
        $this->locks = new \WeakMap();
    }

    #[AsEventListener(event: KernelEvents::CONTROLLER)]
    public function onKernelController(ControllerEvent $event): void
    {
        $attributes = $event->getAttributes();
        if (!isset($attributes[Lock::class])) {
            return;
        }

        /** @var Lock $lockAttr */
        $lockAttr = $attributes[Lock::class][0];

        $request = $event->getRequest();
        $resource = $lockAttr->resourceName;

        // Simple interpolation for request attributes (e.g., 'invoice_{id}')
        foreach ($request->attributes->all() as $key => $value) {
            if (is_scalar($value)) {
                $resource = str_replace("{{$key}}", (string) $value, $resource);
            }
        }

        $this->logger->info(sprintf('Attempting to acquire lock for resource "%s".', $resource));

        $lock = $this->lockFactory->createLock($resource, $lockAttr->ttl);

        if (!$lock->acquire($lockAttr->blocking)) {
            $this->logger->warning(sprintf('Resource "%s" is currently locked.', $resource));
            throw new TooManyRequestsHttpException(null, 'Resource is currently locked.');
        }

        $this->logger->info(sprintf('Lock acquired for resource "%s".', $resource));

        // Store lock to release it later
        $this->locks[$event->getRequest()] = $lock;
    }

    #[AsEventListener(event: KernelEvents::TERMINATE)]
    public function onKernelTerminate(TerminateEvent $event): void
    {
        $request = $event->getRequest();
        if (isset($this->locks[$request])) {
            /** @var LockInterface $lock */
            $lock = $this->locks[$request];
            $resource = 'unknown'; // Can't easily get the resource name back from the lock object

            $this->logger->info(sprintf('Releasing lock for request to "%s".', $request->getPathInfo()));
            $lock->release();
            unset($this->locks[$request]);
        }
    }
}
 Waxaa la isticmaali karaa in controller-ka Tani, controller aad waa qiyaasta, si aad u aragto, iyo si aad u aragto. namespace App\Controller;

use App\Attribute\Lock;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;

class InvoiceController extends AbstractController
{
    #[Route('/invoice/{id}/generate', name: 'invoice_generate')]
    #[Lock(resourceName: 'invoice_{id}', ttl: 60)]
    public function generate(int $id): Response
    {
        // This code executes ONLY if the lock is acquired
        // ... heavy generation logic ...
        
        return new Response('Invoice generated');
    }
 Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Si aad u shaqeeyaan 31 saacadood, laakiin aad qaado TTL waa 30 saacadood, xawaaraha waxay ku yaalaa, si ay u baahan tahay nidaamka kale si ay u shaqeeyaan, si ay u caawinayaa data. Sida loo yaabaa in ay ku yaalaa TTL mashiinka (e.g., 1 saacad), oo loo yaabaa nidaamka in la xira, loo isticmaali karaa TTL ka mid ah oo ka mid ah wax soo saarka. $lock = $factory->createLock('import_job', ttl: 30);
$lock->acquire(blocking: true);

try {
    foreach ($largeDataSet as $row) {
        $this->processRow($row);
        
        // Extend the lock by another 30 seconds
        $lock->refresh(); 
    }
} finally {
    $lock->release();
}
 Verification: 
 
 
 
 Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Waayo, waxaa laga yaabaa in la soo xiriir oo ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah. Waayo, ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah. Qalabka dhismaha Sida loo helo, Waayo, waxaa loo yaqaan 'False' oo ka mid ah 'Fake' oo ka mid ah 'Fake' oo ka mid ah 'Fake' oo ka mid ah 'Fake'. acquire() // Wait forever until lock is free
$lock->acquire(true);
 Waayo, waxaa laga yaabaa in ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah mid ah mid ka mid ah: Best Practice: $maxRetries = 5;
$retryCount = 0;

while (!$lock->acquire()) {
    if ($retryCount++ >= $maxRetries) {
        throw new \Exception('Could not acquire lock after 5 attempts');
    }
    sleep(1); // Wait 1 second before retrying
}
 Qalabka Marka loo isticmaali Qalabka waa in ka mid ah "Locking" files; waa in ka mid ah dhismaha arkiibta. symfony/lock 
 
 
 
 
 Waayo, waxaa loo isticmaali karaa Named Lockers (Lockers Nominated): Waayo, waxaa loo isticmaali karaa in ka mid ah macluumaadka (Order, cron, user). Ma rabtaa Remote Stores: loo isticmaalo Redis ama DynamoDB ee wax soo saarka oo loo isticmaalaa in ka badan mid ka mid ah server. Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Qalabka Shuruudaha First: Block try-finally waa non-negotiable. Haddii aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan tahay in aad u baahan yahay. Waxaad ka mid ah u baahan tahay in ay ka mid ah wax soo saarka ah ee loo yaqaan "GitHub": [ ] Source Code: https://github.com/mattleads/SymfonyLockSample https://github.com/mattleads/SymfonyLockSample Nala soo xiriir! Haddii aad u baahan tahay in aad u isticmaali karaa, ama aad u baahan tahay in aad u isticmaali karaa, waxaan sidoo kale u baahan tahay in aad isticmaali karaa in aad isticmaali karaa. 
 
 
 
 
 Haku: [https://www.linkedin.com/in/matthew-mochalkin/] X (Twitter): [https://x.com/MattLeads] Haku: [https://t.me/MattLeads] GitHub: [https://github.com/mattleads] https://www.linkedin.com/in/matthew-mochalkin/ https://x.com/MattLeads https://t.me/MattLeads https://github.com/mattleads

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