public async Task QueueShelf(Shelf productData)
{
try
{
_logger.LogInformation($"Number of products on shelf: {productData.Products.Length}");
if (shelfQueue.Count() > 120)
{
while (shelfQueue.Count() > 120)
{
await shelfQueue.DequeueAsync(new CancellationToken()); //throw away result
}
}
// exit early if we dont have a deserialized element and a serial number
if (productData != null)
{
_logger.LogInformation("Shelf Data Generator queueing in progress...");
shelfQueue.QueueShelf(productData);
}
}
catch (AggregateException ex)
{
_logger.LogError($"Error processing message: {ex.Flatten()}");
}
catch (Exception ex)
{
_logger.LogError($"Error processing message: {ex}");
}
}
public void QueueShelf(Shelf shelf)
{
if (shelf == null)
{
throw new ArgumentNullException(nameof(shelf));
}
_shelves.Enqueue(shelf);
_signal.Release();
}
/*The PipeMessage method is what will connect to the IoT Edge Hub and will queue the shelf data
* for processing.
*
* It will be registered as an inputMessageHandler with the IoT Edge Hub in the ExecuteAsync method
* that follows.
*/
public async Task <MessageResponse> PipeMessage(Message message, object userContext)
{
var moduleClient = userContext as ModuleClient;
if (moduleClient == null)
{
throw new InvalidOperationException("UserContext doesn't contain " + "expected values");
}
/*This section receives the data from the IoT Edge Hub and converts it to a Shelf object
* for processing through signalR to the WebApp module.
*/
byte[] messageBytes = message.GetBytes();
string messageString = Encoding.UTF8.GetString(messageBytes);
if (!string.IsNullOrEmpty(messageString))
{
try{
Console.WriteLine($"Receiving Message: {messageString.TrimStart('"').TrimEnd('"').Replace('\\', ' ')}");
Shelf productData = JsonConvert.DeserializeObject <Shelf>
(messageString.TrimStart('"').TrimEnd('"').Replace("\\", String.Empty));
/*If we have more than 120 shelves to process, remove down to the limit*/
if (shelfQueue.Count() > 120)
{
while (shelfQueue.Count() > 120)
{
await shelfQueue.DequeueAsync(new CancellationToken()); //throw away result
Console.WriteLine("Dequeing Extra live shelves.");
}
}
if (productData != null)
{
// Use appropriate shelfQueue based on count.
if (productData.Products.Count() == 0)
{
Console.WriteLine("Queuing 'Live' Feed for displaying in WebApp.");
shelfQueue.QueueShelf(productData);
}
}
// catch and swallow exceptions
} catch (AggregateException ex) {
Console.WriteLine($"Error processing message: {ex.Flatten()}");
} catch (Exception ex) {
Console.WriteLine($"Error processing message: {ex}");
}
}
return(MessageResponse.Completed);
}
