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 App\Http\Controllers;
use App\Models\Payment;
use Illuminate\Support\Facades\DB;
use App\Exceptions\PaymentException;
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.