Nan aplikasyon yo ki trè konpetitif, kondisyon ras yo asirans silenn nan integrite done. Si li anpeche doub-rezèvasyon nan yon sistèm rezèvasyon, asire yon travay cron kouri sou sèlman yon sèvè, oswa boule itilize API, Li se premye liy nan defans ou. Symfony Lock Component avèk liberasyon an nan , ekosistèm la te matirite, ofri atribit ki pi limyè, pi bon entegre ak magazen natif natal (tankou ), ak PHP 8.4 sipò. Atik sa a kouvri batay-teste pratik yo pi byen mwen sèvi ak nan pwodiksyon, asire aplikasyon ou rete robust ak gratis. Symfony 7.4 DynamoDB Instalasyon ak Konfigirasyon Kòmanse pa enstale eleman an. Nou pral itilize estanda a Si ou planifye pou sèvi ak Redis (rekomande pou sistèm distribiye), asire w ke ou gen yon kliyan tankou Ou nan Extansyon nan. 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
 Konfigirasyon nan defini ou “ .” Yon erè komen se lè l sèvi avèk yon sèl magazen default pou tout. Mwen rekòmande defini pou domèn biznis diferan pou evite kolizyon ak pèmèt diferan estrateji depo (pou egzanp, dosye lokal pou travay cron vs. Redis pou aksyon itilizatè). 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)%'
 Règ la Golden: modèl la Try-Finally Yon sèl règ ki pi enpòtan lè travay ak blòk se asire ke yo libere, menm si kòd ou kraze. Pandan ke Symfony ap eseye pou otomatikman libere blòk sou destriksyon objè, ou pa ta dwe depann sou konpòtman entansyon pou resous kritik. Modèl la Toujou ranpli seksyon kritik ou nan yon blòk eseye ak libere nan finalman. 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
    }
}
 Pou tcheke sa a travay, jwi yon eksepsyon nan blòk la eseye pandan devlopman an. 
 
 
 
 Jwenn yon Lock. Jwi yon nouvo \Exception (‘Crash!’) Tcheke depo ou (pou egzanp, Redis KEYS *). Chaje kle a ta dwe ale imedyatman apre eksepsyon an te pran pa kernel la oswa boule moute. Chwazi boutik la dwat Chwazi boutik la mal se yon mank arsitektyèl komen. +----------+--------------------------------------+---------------------------------------+-----------------------------------------------------------+
| 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 ak Flock oswa Semaphore si w ap kouri sou yon sèl machin ak bezwen vitès maksimòm ak minimòm overhead. Go Distribye ak Redis pou pi fò aplikasyon web modèn, kote plizyè nodes bezwen koordine byen vit. Go Cloud-Native ak DynamoDB si ou se bati nan yon anviwònman san serveur kote kenbe yon koneksyon persistent ak yon cache tankou Redis se pa efikas. Si ou kouri sou Kubernetes, pa janm sèvi ak Flock oswa Semaphore pou Lock nan nivo aplikasyon. Toujou itilize Redis, Memcached, oswa Database magazen (PDO / DynamoDB). Deklaratif Locking ak atribit Nan Symfony 7.4 + PHP 8.x, nou ka netwaye kontwòl nou anpil. Anplis de enjekte nan chak kontwoleur, nou ka kreye yon koutim atribit. Sa a se yon modèl "Senior Developer" ki kenbe logik domèn ou klè. LockFactory #[Lock] Kreye atribit la 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
    ) {}
}
 Kreye evènman an Listener Nou itilize evènman yo nan Kernel a pou achte blòk la anvan kontwòl la execute ak libere li apre sa. 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]);
        }
    }
}
 Sèvi ak li nan kontwòl ou Koulye a, kontwòl ou se limyè, liable, ak san danje. 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');
    }
 Kòmanse Task Long Running: Metòd la refresh() Yon koupe komen se mete yon TTL (Time To Live) ki se trè kout pou travay la. Si travay ou pran 31 segonn, men TTL la bloke ou se 30 segonn, bloke a pral peryòd, pèmèt yon lòt pwosesis kòmanse, potansyèlman pèdi done. Plis pase mete yon TTL masiv (pou egzanp, 1 èdtan), ki bloke sistèm la si yon kraze rive, sèvi ak yon TTL pi kout ak refresh li. $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: 
 
 
 
 Kòmanse yon TTL nan 5 segonn. Kòmanse yon lyen ki sove pou 2 segonn ak rele refresh(). Monitè tan fin vye granmoun nan magazen ou a (pou egzanp, Redis TTL lock_key). Ou ta dwe wè li reset nan 30s repete, pa janm ba nan 0. Bloke vs. pa bloke nan default, se non-bloke. Li retire false imedyatman si resous la se okipe. Passe verite a atann: acquire() // Wait forever until lock is free
$lock->acquire(true);
 Evite bloke san limit nan demann HTTP. Li konekte travayè PHP-FPM ou ak ka mennen nan yon 504 Gateway Timeout. Sèvi ak yon loop ak yon timeout pou pi bon kontwòl: 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
}
 Konklisyon Sèvi ak konpozan se pa sèlman sou "bloke" dosye; li se sou entansyon arsitektyèl. Nan Symfony 7.4: symfony/lock 
 
 
 
 
 Toujou sèvi ak Nimewo Lockers: Separe magazen an bloke ou pa domèn (order, cron, itilizatè). Prefer Remote Stores: Sèvi ak Redis oswa DynamoDB pou nenpòt aplikasyon ki kouri sou plis pase yon sèvè. Clean Kòd: Adopte modèl Attribit yo retire boilerplate soti nan kontwòl ou yo. Sécurité Première: Tès-final blòk la se pa negosyab. Konpetisyon bugs yo notèman difisil replike. Implemantasyon modèl sa yo jodi a pral sove ou èdtan nan debugging jodi a. Ou ka jwenn deplwaman an plen ak swiv pwojè a nan pwojè a sou GitHub: [ ] Source Code: https://github.com/mattleads/SymfonyLockSample https://github.com/mattleads/SymfonyLockSample Tanpri konekte nou! Si ou te jwenn sa a itil oswa gen kesyon sou implemantasyon an, mwen ta renmen tande soti nan ou. Reste nan kontak ak kenbe konvèsasyon an sou platfòm sa yo: 
 
 
 
 
 Linkedin: [https://www.linkedin.com/in/matthew-mochalkin/] X (Twitter): [https://x.com/MattLeads] Telefòn: [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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