public async Task <IEnumerable <Event> > ProcessAsync(Event evnt)
        {
            var itemBackInStockForOrder = evnt.GetBody <ItemBackInStockForOrder>();
            var parkedItems             = (await _parkedOrderItemsStore.GetAsync("ProductQueuedForOrder",
                                                                                 itemBackInStockForOrder.OrderId)).ToArray();
            var parkedOrderItem = parkedItems.Single(x => x.ProductId == itemBackInStockForOrder.ProductId);

            parkedOrderItem.IsItemReadyToShip = true;
            _parkedOrderItemsStore.UpdateAsync("ProductQueuedForOrder", itemBackInStockForOrder.OrderId,
                                               parkedOrderItem);
            if (parkedItems.Any(x => !x.IsItemReadyToShip))
            {
                Trace.TraceInformation("ItemBackInStockForOrderActor - still items remaining");
                return(new Event [0]);
            }
            else // ready
            {
                Trace.TraceInformation("ItemBackInStockForOrderActor - itemss all OK");

                return(new[]
                {
                    new Event(new OrderInventoryCheckCompleted()
                    {
                        OrderId = itemBackInStockForOrder.OrderId
                    })
                });
            }
        }
        public async Task <IEnumerable <Event> > ProcessAsync(Event evnt)
        {
            var productArrivedBackInStock = evnt.GetBody <ProductArrivedBackInStock>();
            var orders = await _ordersWaitingProvider.GetAsync("OrderQueuedForProduct",
                                                               productArrivedBackInStock.ProductId);

            _ordersWaitingProvider.RemoveAsync("OrderQueuedForProduct",
                                               productArrivedBackInStock.ProductId).Wait();


            return(orders.Select(x => new Event(new ItemBackInStockForOrder()
            {
                ProductId = productArrivedBackInStock.ProductId,
                OrderId = x.OrderId
            })));
        }