public void removeProduct(Product product, int quantity) {
InventoryItem inventoryItem = inventory.get(product.getId());
inventoryItem.deplete(quantity);
}
@ReadOnly
public boolean isProductAvailable(Product product, int quantity) {
InventoryItem inventoryItem = inventory.get(product.getId());
return inventoryItem.getQuantityOnHand() >= quantity;
}
public void addProduct(Product product, int quantity) {
InventoryItem inventoryItem = inventory.get(product.getId());
inventoryItem.replenish(quantity);
}