Managing Concurrent Requests with Laravel Session Blocking

Laravel’s session blocking prevents race conditions and data inconsistencies by controlling concurrent session access. This feature ensures data integrity during simultaneous operations.

Understanding Session Blocking

Session blocking requires:

• Cache driver supporting atomic locks (redis, memcached, dynamodb, database)
• Non-cookie session driver

Route::post('/endpoint', function() {
    // Operation logic
})->block($lockSeconds = 5, $waitSeconds = 10);

Real-World Implementation

Let’s build a payment processing system with concurrency control:

<?php

namespace AppHttpControllers;

use AppModelsPayment;
use IlluminateSupportFacadesDB;
use AppExceptionsPaymentException;

class PaymentController extends Controller
{
    public function process(Request $request)
    {
        return DB::transaction(function() use ($request) {
            // Validate payment exists and isn't processed
            $payment = Payment::findOrFail($request->payment_id);
            
            if ($payment->isProcessed()) {
                throw new PaymentException('Payment already processed');
            }

            // Process payment
            $result = $this->paymentGateway->charge([
                'amount' => $payment->amount,
                'currency' => $payment->currency,
                'token' => $request->payment_token
            ]);
            $payment->markAsProcessed($result->transaction_id);

            return response()->json([
                'status' => 'success',
                'transaction_id' => $result->transaction_id
            ]);
        });
    }
}

// routes/api.php
Route::post('/payments/process', [PaymentController::class, 'process'])->block(5, 10);

This implementation:

• Prevents duplicate payment processing
• Waits up to 10 seconds for lock acquisition
• Uses database transactions for atomicity
• Handles concurrent requests gracefully

Session blocking provides a robust solution for managing concurrent requests, ensuring data integrity in high-traffic applications while maintaining a clean, Laravel-centric implementation.

The post Managing Concurrent Requests with Laravel Session Blocking appeared first on Laravel News.

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