private CalcMessage readNextMessage(IMsgBusContext queue)
{
CalcMessage message = null;
int retryCount = Int32.Parse(ConfigurationManager.AppSettings["QueueGetMessageRetry"]);
int retryWaitSec = Int32.Parse(ConfigurationManager.AppSettings["QueueGetMessageRetryWaitSec"]);
try
{
while (retryCount > 0 && message == null)
{
MsgBusPayload payload = queue.GetNextMessage();
--retryCount;
if (payload != null)
{
message = JsonConvert.DeserializeObject <CalcMessage>(payload.Payload);
}
else
{
Console.WriteLine(String.Format("{1} No message - waiting: retries left {0}", retryCount, DateTime.UtcNow.ToShortTimeString()));
System.Threading.Thread.Sleep(retryWaitSec * 1000);
}
}
}
catch (Exception ex)
{
Console.WriteLine(String.Format("{1} Exception while reading message: {0}", ex.Message, DateTime.UtcNow.ToShortTimeString()));
message = null;
}
return(message);
}
private IMsgBusContext prepareMsgBusConext()
{
IMsgBusContext ctx = WebApiApplication.CompositionContainer.GetExportedValue <IMsgBusContext>(
ConfigurationManager.AppSettings["MessageBus"]);
IMsgBusContextParams ctxParams = ctx.PrepareParams();
ctxParams.Parameters["StorageAccountName"] = ConfigurationManager.AppSettings["StorageAccountName"];
ctxParams.Parameters["StorageAccountKey"] = ConfigurationManager.AppSettings["StorageAccountKey"];
ctxParams.Parameters["MessageQueue"] = ConfigurationManager.AppSettings["MessageQueue"];
ctx.Init(ctxParams);
return(ctx);
}
private IMsgBusContext prepareMsgBusConext()
{
IMsgBusContext ctx = Startup.CompositionContainer.GetExportedValue <IMsgBusContext>(
config["MessageBus"]);
IMsgBusContextParams ctxParams = ctx.PrepareParams();
ctxParams.Parameters["StorageAccountName"] = config["StorageAccountName"];
ctxParams.Parameters["StorageAccountKey"] = config["StorageAccountKey"];
ctxParams.Parameters["MessageQueue"] = config["MessageQueue"];
ctx.Init(ctxParams);
return(ctx);
}
public void Start()
{
#region composition
AggregateCatalog catalog = new AggregateCatalog();
DirectoryCatalog directoryCatalog = new DirectoryCatalog(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location));
catalog.Catalogs.Add(directoryCatalog);
catalog.Catalogs.Add(new AssemblyCatalog(typeof(SampleHeavyCalc).Assembly));
CompositionContainer = new CompositionContainer(catalog);
CompositionContainer.ComposeParts(this);
#endregion
CloudStorageAccount account = createCloudStorageAccount();
CloudBlobClient client = account.CreateCloudBlobClient();
CloudBlobContainer container = getBlobContainer(client, ConfigurationManager.AppSettings["ContainerInput"]);
CalcMessage message = null;
IMsgBusContext msgBusContext = prepareMsgBusConext();
do
{
message = readNextMessage(msgBusContext);
if (message != null)
{
string inputFileName = message.InputFileName;
List <decimal> inputs = getInput(container, inputFileName);
List <decimal> outputs = process(inputs);
writeOutput(container, inputFileName, outputs);
}
}while (message != null);
}
public HeavyCalcController()
{
ctxMsgBus = prepareMsgBusConext();
}
public HeavyCalcController(IConfiguration config, ILogger <EchoController> logger)
{
this.config = config;
ctxMsgBus = prepareMsgBusConext();
this.logger = logger;
}
