public static async Task <bool> RunOrchestrator(
[OrchestrationTrigger] IDurableOrchestrationContext context)
{
var userId = context.GetInput <string>();
var shoppingCartEntity = new EntityId(nameof(ShoppingCartEntity), userId);
var inventoryEntity = new EntityId(nameof(InventoryEntity), "onestore");
var orderEntity = new EntityId(nameof(OrderEntity), userId);
// Create a critical section to avoid race conditions.
using (await context.LockAsync(inventoryEntity, orderEntity, shoppingCartEntity))
{
IShoppingCart shoppingCartProxy =
context.CreateEntityProxy <IShoppingCart>(shoppingCartEntity);
IInventory inventoryProxy =
context.CreateEntityProxy <IInventory>(inventoryEntity);
IOrder orderProxy =
context.CreateEntityProxy <IOrder>(orderEntity);
var shoppingCartItems = await shoppingCartProxy.GetItemsAsync();
var orderItem = new OrderItem()
{
Timestamp = DateTime.UtcNow,
UserId = userId,
Details = shoppingCartItems
};
var canSell = true;
foreach (var inventoryItem in orderItem.Details)
{
if (await inventoryProxy.IsItemInInventory(inventoryItem))
{
await inventoryProxy.RemoveStockAsync(inventoryItem);
await shoppingCartProxy.RemoveItemAsync(inventoryItem);
}
else
{
canSell = false;
break;
}
}
if (canSell)
{
await orderProxy.AddAsync(orderItem);
// order placed successfully
return(true);
}
// the order failed due to insufficient stock
return(false);
}
}
