public void ToGetInLine(IReadOnlyBuyer buyer)
{
if (buyer == null)
{
throw new ArgumentNullException(nameof(buyer));
}
if (_buyers.Any(b => b.Id == buyer.Id))
{
throw new BuyerAlreadyInQueueException();
}
var lockTaken = false;
try
{
_spinLock.Enter(ref lockTaken);
_buyers.Enqueue(buyer);
if (Object.IsAvailable(out var count))
{
Notify(count);
}
}
finally
{
if (lockTaken)
{
_spinLock.Exit(false);
}
}
}
private void MakePurchasesInternal(IReadOnlyBuyer buyer)
{
var remainingAmount = buyer.Basket.Products.Count;
foreach (var product in buyer.Basket.Products)
{
PunchProduct(product);
remainingAmount--;
OnScanned(buyer, product, remainingAmount);
}
}
public ShelfTakedProductEventArgs(IReadOnlyBuyer buyer, IReadOnlyShelf shelf, Product product, int remainingAmount)
{
if (buyer == null)
{
throw new ArgumentNullException(nameof(buyer));
}
if (shelf == null)
{
throw new ArgumentNullException(nameof(shelf));
}
if (product == null)
{
throw new ArgumentNullException(nameof(product));
}
Buyer = buyer;
Shelf = shelf;
Product = product;
RemainingAmount = remainingAmount;
}
public IReadOnlyCollection <Product> TakeAnyProducts(int count, IReadOnlyBuyer buyer)
{
if (buyer == null)
{
throw new ArgumentNullException(nameof(buyer));
}
if (!IsAvailable())
{
throw new ShelfIsBusyException();
}
_semaphoreSlim.Wait();
var result = TakeProductInternal(count, buyer);
_semaphoreSlim.Release();
Availabled?.Invoke(this, EventArgs.Empty);
return(result);
}
public CashboxScanEventArgs(IReadOnlyBuyer buyer, IReadOnlyCashbox cashbox, Product product, int remainingAmount)
{
if (buyer == null)
{
throw new ArgumentNullException(nameof(buyer));
}
if (cashbox == null)
{
throw new ArgumentNullException(nameof(cashbox));
}
if (product == null)
{
throw new ArgumentNullException(nameof(product));
}
Buyer = buyer;
Cashbox = cashbox;
Product = product;
RemainingAmount = remainingAmount;
}
private List <Product> TakeProductInternal(int count, IReadOnlyBuyer buyer)
{
if (_products.IsEmpty)
{
throw new ShelfIsEmptyException();
}
var result = new List <Product>();
for (int i = 0; i < count; i++)
{
if (!_products.TryTake(out var product))
{
return(result);
}
Task.Delay(TimeSpan.FromSeconds(2)).Wait();
result.Add(product);
OnProductTaked(buyer, product, count - (i + 1));
}
return(result);
}
public Receipt MakePurchases(IReadOnlyBuyer buyer)
{
if (buyer == null)
{
throw new ArgumentNullException(nameof(buyer));
}
if (!IsAvailable())
{
throw new CashboxIsBusyException();
}
_semaphoreSlim.Wait();
MakePurchasesInternal(buyer);
var result = new Receipt(Supermarket, buyer.Basket.Products);
_semaphoreSlim.Release();
Availabled?.Invoke(this, EventArgs.Empty);
return(result);
}
private void OnScanned(IReadOnlyBuyer buyer, Product product, int remainingAmount)
{
Scanned?.Invoke(this, new CashboxScanEventArgs(buyer, this, product, remainingAmount));
}
private void OnProductTaked(IReadOnlyBuyer buyer, Product product, int remainingAmount)
{
ProductTaked?.Invoke(this, new ShelfTakedProductEventArgs(buyer, this, product, remainingAmount));
}
