Solution: Thread-Safe Voucher Redemption

Review how to use the lock statement to safely evaluate and mutate shared state to prevent double-spending in concurrent environments.

Home

Courses

Learn C# Fundamentals

Solution: Thread-Safe Voucher Redemption

Review how to use the lock statement to safely evaluate and mutate shared state to prevent double-spending in concurrent environments.

C# 14.0

using System.Threading;
namespace ECommerce;
public class VoucherService
{
    public bool IsVoucherUsed { get; private set; } = false;
    
    private readonly object _voucherLock = new object();
    public bool RedeemVoucher()
    {
        lock (_voucherLock)
        {
            if (!IsVoucherUsed)
            {
                // Simulate random network/database delay
                Thread.Sleep(new Random().Next(10, 100)); 
                IsVoucherUsed = true;
                return true;
            }
            
            return false;
        }
    }
}