/// <summary>
/// Accepts a restock request and changes the Actor's state accordingly. The request is processed
/// async and the caller will be notified when the processing is done.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public async Task AddRestockRequestAsync(RestockRequest request)
{
RestockRequestActorState state = await this.StateManager.GetStateAsync <RestockRequestActorState>(ActorStatePropertyName);
if (state.IsStarted()) //Don't accept a request that is already started
{
ActorEventSource.Current.Message(string.Format("RestockRequestActor: {0}: Can't accept restock request in this state", state));
throw new InvalidOperationException(string.Format("{0}: Can't accept restock request in this state", state));
}
// Accept the request
ActorEventSource.Current.ActorMessage(this, "RestockRequestActor: Accept update quantity request {0}", request);
state.Status = RestockRequestStatus.Accepted;
state.Request = request;
await this.StateManager.SetStateAsync <RestockRequestActorState>(ActorStatePropertyName, state);
// Start a reminder to go through the processing pipeline.
// A reminder keeps the actor from being garbage collected due to lack of use,
// which works better than a timer in this case.
await this.RegisterReminderAsync(
RestockRequestReminderNames.RestockPipelineChangeReminderName,
null,
PipelineStageVerificationDelay,
PipelineStageProcessingDuration);
return;
}
public static void Run([QueueTrigger("orders", Connection = "AzureWebJobsStorage")] string myQueueItem,
TraceWriter log)
{
log.Info($"RestockProducts function triggered.");
RestockRequest restockRequest = JsonConvert.DeserializeObject <RestockRequest>(myQueueItem);
var productRepository = new ProductRepository();
productRepository.IncrementProductCount(restockRequest.ProductId, restockRequest.RestockQuantity).Wait();
}
public static async Task <HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequestMessage req,
TraceWriter log)
{
log.Info("Order Products function triggered.");
// Retrieve the order request details
var order = await req.Content.ReadAsAsync <OrderRequest>();
if (order == null)
{
return(req.CreateResponse(HttpStatusCode.BadRequest, "Missing order details."));
}
// Retrieve the product
var productRepository = new ProductRepository();
var product = productRepository.GetProductById(order.Item.ProductId);
// If the product does not exist return a meaningful response
if (product == null)
{
var response = new OrderResponse {
OrderStatus = "Unsuccessful", Message = "Product not found"
};
return(req.CreateResponse(HttpStatusCode.OK, response));
}
// Check to see if there is enough inventory
var orderResponse = new OrderResponse()
{
OrderStatus = "Success"
};
if (product.Count >= order.Item.Quantity)
{
orderResponse.Message = "Your product will be shipped within 5 business days.";
}
else
{
orderResponse.Message = "Your product will be shipped within 10 business days.";
// Place an item into a queue to manufacture more products.
var restock = new RestockRequest {
ProductId = product.Id, RestockQuantity = order.Item.Quantity * 2
};
await SendRestockMessageToQueue(JsonConvert.SerializeObject(restock));
}
// Decrement the inventory count
productRepository.DecrementProductCount(product.Id, order.Item.Quantity).Wait();
return(req.CreateResponse(HttpStatusCode.OK, orderResponse));
}
/// <summary>
/// This method uses an IReliableQueue to store completed RestockRequests which are later sent to the client using batch processing.
/// We could send the request immediately but we prefer to minimize traffic back to the Inventory Service by batching multiple requests
/// in one trip.
/// </summary>
/// <param name="actorId"></param>
/// <param name="request"></param>
public async void RestockRequestCompleted(ActorId actorId, RestockRequest request)
{
IReliableQueue <RestockRequest> completedRequests = await this.StateManager.GetOrAddAsync <IReliableQueue <RestockRequest> >(CompletedRequestsQueueName);
using (ITransaction tx = this.StateManager.CreateTransaction())
{
await completedRequests.EnqueueAsync(tx, request);
await tx.CommitAsync();
}
IRestockRequestActor restockRequestActor = ActorProxy.Create <IRestockRequestActor>(actorId, this.ApplicationName);
await restockRequestActor.UnsubscribeAsync <IRestockRequestEvents>(this); //QUESTION:What does this method do?
}
/// <summary>
/// This method activates an actor to fulfill the RestockRequest.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public async Task AddRestockRequestAsync(RestockRequest request)
{
try
{
//Get dictionary of Restock Requests
IReliableDictionary <InventoryItemId, ActorId> requestDictionary =
await this.StateManager.GetOrAddAsync <IReliableDictionary <InventoryItemId, ActorId> >(ItemIdToActorIdMapName);
ActorId actorId = ActorId.CreateRandom();
try
{
using (ITransaction tx = this.StateManager.CreateTransaction())
{
await requestDictionary.AddAsync(tx, request.ItemId, actorId);
await tx.CommitAsync();
}
}
catch (ArgumentException)
{
// restock request already exists
return;
}
// Create actor proxy and send the request
IRestockRequestActor restockRequestActor = ActorProxy.Create <IRestockRequestActor>(actorId, this.ApplicationName);
await restockRequestActor.AddRestockRequestAsync(request);
// Successfully added, register for event notifications for completion
await restockRequestActor.SubscribeAsync <IRestockRequestEvents>(this);
ServiceEventSource.Current.ServiceMessage(this, "Created restock request. Item ID: {0}. Actor ID: {1}", request.ItemId, actorId);
}
catch (InvalidOperationException ex)
{
ServiceEventSource.Current.Message(string.Format("RestockRequestManagerService: Actor rejected {0}: {1}", request, ex));
throw;
}
catch (Exception ex)
{
ServiceEventSource.Current.Message(string.Format("RestockRequestManagerService: Exception {0}: {1}", request, ex));
throw;
}
}
private static async void AddRestockRequestsAsync()
{
// TODO: need to go to correct partition
// For now, the inventory is not partitioned, so always go to first partition
IRestockRequestManager restockRequestService = ServiceProxy.Create <IRestockRequestManager>(0, RestockRequestManagerServiceName);
IList <Task> tasks = new List <Task>();
for (int i = 0; i < ParallelRequests; i++)
{
RestockRequest request = GenerateRandomRequest();
Console.WriteLine("Add request {0}", request);
tasks.Add(restockRequestService.AddRestockRequestAsync(request));
}
await Task.WhenAll(tasks);
}
private async Task PeriodicInventoryCheck(CancellationToken cancellationToken)
{
IReliableDictionary <InventoryItemId, InventoryItem> inventoryItems =
await this.stateManager.GetOrAddAsync <IReliableDictionary <InventoryItemId, InventoryItem> >(InventoryItemDictionaryName);
if (this.storageType == StorageTypes.Azure)
{
await this.InitializeAsync(cancellationToken);
}
while (!cancellationToken.IsCancellationRequested)
{
ServiceEventSource.Current.ServiceMessage(this, "Checking inventory stock for {0} items.", await inventoryItems.GetCountAsync());
foreach (InventoryItem item in inventoryItems.Select(x => x.Value))
{
cancellationToken.ThrowIfCancellationRequested();
try
{
//Check if stock is below restockThreshold and if the item is not already on reorder
if ((item.AvailableStock <= item.RestockThreshold) && !item.OnReorder)
{
ServiceUriBuilder builder = new ServiceUriBuilder(RestockRequestManagerServiceName);
IRestockRequestManager restockRequestManagerClient = ServiceProxy.Create <IRestockRequestManager>(0, builder.ToUri());
// we reduce the quantity passed in to RestockRequest to ensure we don't overorder
RestockRequest newRequest = new RestockRequest(item.Id, (item.MaxStockThreshold - item.AvailableStock));
InventoryItem updatedItem = new InventoryItem(
item.Description,
item.Price,
item.AvailableStock,
item.RestockThreshold,
item.MaxStockThreshold,
item.Id,
true);
// TODO: this call needs to be idempotent in case we fail to update the InventoryItem after this completes.
await restockRequestManagerClient.AddRestockRequestAsync(newRequest);
// Write operations take an exclusive lock on an item, which means we can't do anything else with that item while the transaction is open.
// If something blocks before the transaction is committed, the open transaction on the item will prevent all operations on it, including reads.
// Once the transaction commits, the lock is released and other operations on the item can proceed.
// Operations on the transaction all have timeouts to prevent deadlocking an item,
// but we should do as little work inside the transaction as possible that is not related to the transaction itself.
using (ITransaction tx = this.stateManager.CreateTransaction())
{
await inventoryItems.TryUpdateAsync(tx, item.Id, updatedItem, item);
await tx.CommitAsync();
}
ServiceEventSource.Current.ServiceMessage(
this,
"Restock order placed. Item ID: {0}. Quantity: {1}",
newRequest.ItemId,
newRequest.Quantity);
}
}
catch (Exception e)
{
ServiceEventSource.Current.ServiceMessage(this, "Failed to place restock order for item {0}. {1}", item.Id, e.ToString());
}
if (this.storageType == StorageTypes.Local)
{
await this.StateManager.BackupAsync(this.BackupCallbackAsync);
}
else
{
await this.StateManager.BackupAsync(this.BackupCallbackAzureAsync);
}
}
await Task.Delay(TimeSpan.FromSeconds(30), cancellationToken);
}
}
