Appfabric cache Notification problem

Question

Hi i have problem with notification receive , we have cache "Rates" attach configuration 

and my code :

class Program

    {



        static DataCacheServerEndpoint cache_server = new DataCacheServerEndpoint("192.168.1.87", 22233);
        static DataCacheFactoryConfiguration configuration = new DataCacheFactoryConfiguration();
        static List<DataCacheServerEndpoint> servers;
        static DataCache dtCache;
        static void Main(string[] args)
        {

            servers = new List<DataCacheServerEndpoint>(1);
            servers.Add(cache_server);
            configuration.SecurityProperties = new DataCacheSecurity(DataCacheSecurityMode.None, DataCacheProtectionLevel.None);



            configuration.Servers = servers;
            configuration.NotificationProperties = new DataCacheNotificationProperties(1000, new TimeSpan(0, 0, 0, 0, 5));

            configuration.LocalCacheProperties = new DataCacheLocalCacheProperties();

            //Disable exception messages since this sample works on a cache aside
            DataCacheClientLogManager.ChangeLogLevel(System.Diagnostics.TraceLevel.Info);

            DataCacheFactory CacheFactory = null;
            CacheFactory = new DataCacheFactory(configuration);



            dtCache = CacheFactory.GetCache("Rates");
            DataCacheOperations allCacheOperations;
            allCacheOperations = DataCacheOperations.AddItem |
                                                              DataCacheOperations.ReplaceItem |
                                                              DataCacheOperations.RemoveItem;

            DataCacheNotificationDescriptor dtnDesc2 = dtCache.AddItemLevelCallback("Rates", allCacheOperations, myCacheLvlDelegate);

            Console.WriteLine("Ready for receive notifications"); 
            Console.Read(); 
        }

        public static void myCacheLvlDelegate(string myCacheName,
                          string myRegion,
                          string myKey,
                          DataCacheItemVersion itemVersion,
                          DataCacheOperations OperationId,
                          DataCacheNotificationDescriptor nd)
                                {
                                    //display some of the delegate parameters
                                    Console.WriteLine("A cache-level notification was triggered!");
                                    Console.WriteLine("    Cache: " + myCacheName);
                                    Console.WriteLine("    Region: " + myRegion);
                                    Console.WriteLine("    Key: " + myKey);
                                    Console.WriteLine("    Operation: " + OperationId.ToString());
                                    Console.WriteLine();
                                }
    }

i can update cache in push mode but i can't receive notification , why ?

Regards

Alex 

Answer 1

Hello Alex,

There is a small bug in the code.

DataCacheNotificationDescriptor dtnDesc2 = dtCache.AddItemLevelCallback("Rates", allCacheOperations, myCacheLvlDelegate);

When you want ItemLevel Call back, the first parameter of AddItemLevelCallback is supposed to be the "key" (item) on which you want notifications [Where as you are specifying "cacheName"]. Documentation pointer - http://msdn.microsoft.com/en-us/library/ff424507(v=ws.10)

So, in your case if you want call back for various operations on the cache you need to use AddCacheLevelCallback - If you use this method you would get notification call backs for different operations as you specify in the method params.

Hope the difference is clear.

Thanks

Ranganath G