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CHAPTER 6 AZURE .NET SERVICES SERVICE BUS
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{ _timer = new System.Timers.Timer(1000); _timer.Elapsed += new System.Timers.ElapsedEventHandler(PollingQueueData); _timer.AutoReset = true; _timer.Enabled = true; _timer.Start(); } private void _Initialization() { string solutionName = ConfigurationManager.AppSettings["Solution"]; string queueName = ConfigurationManager.AppSettings["QueueName"]; AzureSolutionCredential azureSolutionCredential = new AzureSolutionCredential(solutionName); Uri queueUri = ServiceBusEnvironment.CreateServiceUri("sb", solutionName, string.Format("/{0}/", queueName)); TransportClientEndpointBehavior userNamePasswordServiceBusCredential = new TransportClientEndpointBehavior(); userNamePasswordServiceBusCredential.CredentialType = TransportClientCredentialType.UserNamePassword; userNamePasswordServiceBusCredential.Credentials.UserName.UserName = solutionName; userNamePasswordServiceBusCredential.Credentials.UserName.Password = azureSolutionCredential.Password; QueuePolicy queuePolicy = new QueuePolicy(); queuePolicy.ExpirationInstant = DateTime.UtcNow + TimeSpan.FromHours(1); QueueClient = QueueRenewalHelper<T>.GetOrCreateQueue<T>( userNamePasswordServiceBusCredential, queueUri, ref queuePolicy); } protected void PollingQueueData(object source, System.Timers.ElapsedEventArgs e) { if (null != QueueClient) { try { _queueMessage = QueueClient.Retrieve(); } catch { } if (null != _queueMessage) { T queueData = _queueMessage.Value as T;
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CHAPTER 6 AZURE .NET SERVICES SERVICE BUS
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if (queueData is IComparable) { if (null == _lastQueueMessage || (queueData as IComparable).CompareTo(_lastQueueMessage.Value) != 0) { _lastQueueMessage = _queueMessage; if (null != _dataUpdateEvent) { _dataUpdateEvent(this, new QueueDataUpdateArgs<T>(_queueMessage.Value)); } } } else { throw new ArgumentException( "The data object must implement IComparable interface!", queueData.GetType().Name); } } } } } } 4. Add a new class, QueueDataUpdateArgs<T>, to the project SoftnetSolutions.ServiceBus.QueueFacade. This class is derived from the EventArgs class and accepts a generic type class as the embedded object for the queue message class. The implementation is shown in Listing 6-20.
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Listing 6-20. Implementation of QueueDataUpdateArgs<T> Class using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace SoftnetSolutions.ServiceBus.QueueFacade { using CSharpBuildingBlocks.EventsHelper; public class QueueDataUpdateArgs<T> :EventHelperArgs { public T QueueData { get; set; } public QueueDataUpdateArgs() { } public QueueDataUpdateArgs(T queueData) { QueueData = queueData; }
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public override string ToString() { return string.Empty; } } } Adapting the QueueFacade class to the applications created in the previous exercise, we have the same results as that from the previous exercise but using the .NET Service Bus Queue.
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In this chapter we saw how .NET Service Bus solves two major problems: How to get service requests through a firewall How to discover service endpoints
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We started by examining the .NET Service Bus in detail, including how its service name hierarchy worked and how we register and discover applications with its service registry. The rest of the chapter contained examples of using the .NET Service Bus to connect applications. We wrote a message hub that clients subscribed to. It was fairly simple but demonstrated the simplicity of .NET Service Bus. The next two examples were distibuted connected systems, one of which demonstrated a loosely coupled distributed drawing application. Our final example used the .NET Service Bus Queue and demonstrated the difference between the .NET Service Bus Queue and the Queue storage we saw in 3.
CHAPTER 6 AZURE .NET SERVICES SERVICE BUS
CHAPTER 7
Azure .NET Services Workflows
The .NET Workflow Service provides a highly scalable host for running workflows in the cloud. Workflows can be designed and constructed using Visual Studio s Workflow Designer. A workflow is a set of activities working together to reach the goal of controlling the logic flow and managing the status of an application, as Figure 7-1 shows. Each activity performs a predefined action, for example, sending or receiving a message, implementing the logic of an if-match, or controlling a while loop. In practice, the set of activities is implemented in a separate .NET assembly library to be reused by different applications. Two types of Windows workflows are available in .NET 3.0 or later: sequential workflows and state machine workflows. At the time of this writing, only one type of workflow template is available for a cloud application, the sequential workflow template. To deploy a state machine workflow to the cloud, the dependent .NET assemblies for the workflow item must be deployed to the cloud fabric, which is not supported by Microsoft yet. (All custom-defined machine workflows, where an activity is derived from the base activity class, are not supported either, because you have to deploy the base activity assembly together with the application. I will provide reasons in detail during the exercise project later in the chapter.) An alternate way to support a state machine workflow from a cloud application is using HttpWebRequest and HttpWebResponse instead of using the template from the workflow designer. In this chapter I'll provide a sample solution to address this issue. We are going to see a .NET Workflow Service example limited to the CloudSequential workflow and provide an example of a work-around for a state machine workflow running in the cloud using HttpWebRequest.
Note Windows Workflow Foundation (WF) uses a SQL Server database to persist its status. However, this
database is not installed by the .NET Framework. This database needs to be manually set up before working with WF. Follow the steps at http://msdn.microsoft.com/en-us/library/aa349366(VS.85).aspx to set up the database in your local development environment.
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