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CHAPTER 6 AZURE .NET SERVICES SERVICE BUS
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The format of a queue address is: sb://solution.servicebus.windows.net/QueueName http://solution.servicebus.windows.net/QueueName https://solution.servicebus.windows.net/QueueName
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The queue name can be in any format. In other words, the .NET Service Bus queues can be addressed by subject in the hierarchical structure. This makes the .NET Service Bus Queue a good candidate to be used in an event-driven distributed system. This exercise refactors the .NET Services SDK example TypedMessages. The original source code and document can be found at [install drive]:\Program Files\Microsoft .NET Services SDK\Samples\ServiceBus\ExploringFeatures\Queues\TypedMessages.
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Note The code for this example is in the Exercise 6-4 bundle from the code download.
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To use the .NET Service Bus Queue it is essential to create an instance of the QueueClient class. The core class is the QueueClientFactory, which accepts a generic type T as a parameter since the core member variable in this class, _queueMessage (of type of QueueMessage), does. The steps to create a .NET Service Bus QueueClient are straightforward. 1. Create a service URI by calling a static method CreateServiceUri() from the class ServiceBusEnvironment in the Microsoft.ServiceBus.dll assembly. (This assembly can be found in the Assemblies folder of the .NET Services SDK path.) Create a QueuePolicy. The simplest way, which this exercise uses, is to create the queue policy using the .NET Services SDK s Microsoft.ServiceBus.QueuePolicy class. The QueueClient instances cannot be created directly but must be created via the QueueManagementClient. Create the QueueClientFactory class to wrap up the methods from the SDK s TypedMessages example. This class can be used for both client-side and serverside applications. If this factory class is used for a server-side application, the application can register an update callback notification when a new queue message is detected.
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The implementation of the QueueClientFactory is shown in Listing 6-19. In order to process the update callback notification, the data entity object needs to implement the IComparable interface allowing the caller object to detect the value change of the internal custom-defined data types (in this example the custom data is the enumerator type). This all applies where a WCF data contract type class is used (since under the hood QueueClient uses the WCF service for communication). The QueueClientFactory class has two member variables, _queueMessage and _lastQueueMessage, with the type of QueueMessage defined in the Microsoft.Samples.ServiceBus namespace. Unlike the Azure Queue we explored in 3, this class dose not fire the callback event when a new message is put into the queue. Therefore our wrapper class has to actively poll the queue periodically to get the new message. This is done from the timer tick handler PollingQueueData. If the internal data value of the message is different from that of the last message, the factory wrapper class fires a notification event and persists the message instance to the member variable _lastQueueMessage. This is the reason why the data
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CHAPTER 6 AZURE .NET SERVICES SERVICE BUS
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contract class must implement the IComparable interface if the embedded data is a custom-defined type. Another difference between the Azure Queue storage and .NET Service Bus Queue is that the queue message is not persisted in the QueueMessage class. As I mentioned at the beginning of this exercise, the .NET Service Bus Queue is an application-level queue available through the Internet. Therefore, it would make sense to expect it to have a permanent persistence storage space. This also explains why the Azure Queue does not actively remove the message from queue storage until the client explicitly calls a service to delete it, while the .NET Service Bus Queue does actively remove messages. Listing 6-19. Implementation of QueueClientFactory using using using using using using using using System; System.ServiceModel; System.ServiceModel.Description; Microsoft.ServiceBus; Microsoft.ServiceBus.Description; System.Text; System.ServiceModel.Channels; System.Configuration; SoftnetSolutions.ServiceBus.QueueFacade Microsoft.Samples.ServiceBus; SoftnetSolutions.AzureSolutionCredential; CSharpBuildingBlocks.EventsHelper;
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namespace { using using using
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public class QueueClientFactory<T> where T: class { protected System.Timers.Timer _timer = null; protected QueueClientFactory<T> _queueClientFactory = null; protected QueueMessage<T> _queueMessage = null; protected QueueMessage<T> _lastQueueMessage = null; protected event EventNotificationHandler _dataUpdateEvent = null; public QueueClient<T> QueueClient { get; set; } public QueueClientFactory() { _Initialization(); _StartQueuePollingTimer(); } public event EventNotificationHandler DataUpdateEvent { add { _dataUpdateEvent += value; _StartQueuePollingTimer(); } remove { _dataUpdateEvent -= value; } } private void _StartQueuePollingTimer()
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