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This application requires the ability to raise two different events that are handled by the workflow. To raise these events, you need to implement a local service. Start by creating a new project using the Empty Workflow Project template and name the project SharedWorkflows. This creates a DLL assembly that can be referenced by the Windows Forms demonstration application. You ll need to first define an interface for the local service. Add a new C# interface to the SharedWorkflows project and name it IPersistenceDemo. Listing 8-1 shows the complete contents of the IPersistenceDemo.cs file. Listing 8-1. Complete IPersistenceDemo.cs File using System; using System.Workflow.Activities; namespace SharedWorkflows { /// <summary> /// Events exposed by the PersistenceDemoService /// </summary> [ExternalDataExchange] public interface IPersistenceDemo { event EventHandler<ExternalDataEventArgs> ContinueReceived; event EventHandler<ExternalDataEventArgs> StopReceived; } } The interface is decorated with the ExternalDataExchangeAttribute to identify it as the local service interface. The two events that are defined both use ExternalDataEventArgs as their event arguments. This is a requirement in order to handle these events in a workflow. Next, add a new C# class to the SharedWorkflows project and name it PersistenceDemoService. This is the local service that implements the IPersistenceDemo interface. It is almost as simple as the interface. Listing 8-2 shows the complete PersistenceDemoService.cs file.

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Listing 8-2. Complete PersistenceDemoService.cs File using System; using System.Workflow.Activities; namespace SharedWorkflows { /// <summary> /// Implements events that are handled by workflow instances /// </summary> public class PersistenceDemoService : IPersistenceDemo { #region IPersistenceDemo Members public event EventHandler<ExternalDataEventArgs> ContinueReceived; public event EventHandler<ExternalDataEventArgs> StopReceived; #endregion #region Members used by the host application /// <summary> /// Raise the ContinueReceived event /// </summary> /// <param name="args"></param> public void OnContinueReceived(ExternalDataEventArgs args) { if (ContinueReceived != null) { ContinueReceived(null, args); } } /// <summary> /// Raise the StopReceived event /// </summary> /// <param name="args"></param> public void OnStopReceived(ExternalDataEventArgs args) { if (StopReceived != null) { StopReceived(null, args); } } #endregion } } In addition to implementing the two IPersistenceDemo events, the service includes two methods to raise the events. These methods will be invoked by the host application and are not available to workflows since they are not part of the interface.

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After the AppFabric configuration wizard has successfully configured the Caching Service, you will need to start the cache cluster. Follow these steps to start a new cluster in a single-node cluster environment: 1. 2. 3. 4. 5. 6. Open the PowerShell command window. Execute the following cmdlet: Import-Module DistributedCacheAdministration Execute the following cmdlet: Import-Module DistributedCacheConfiguration Execute the following cmdlet: Use-CacheCluster Execute the following cmdlet: Start-CacheCluster The resulting PowerShell screen should look like it is shown in Figure 5-17.

HTTP BASIC AUTHENTICATION IS NOT SECURE!

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To implement the example workflow, add a new sequential workflow to the SharedWorkflows project and name it PersistenceDemoWorkflow. The workflow requires one property that will be referenced by a condition of the WhileActivity, so it s best to add the property before you begin the visual design of the workflow. Listing 8-3 shows the PersistenceDemoWorkflow.cs file after the property has been added. Listing 8-3. PersistenceDemoWorkflow.cs After Adding a Property using System; using System.Workflow.Activities; namespace SharedWorkflows { /// <summary> /// A workflow that demonstrates the behavior of /// persistence services /// </summary> public sealed partial class PersistenceDemoWorkflow : SequentialWorkflowActivity { public Boolean IsComplete { get; set; } public PersistenceDemoWorkflow() { InitializeComponent(); } } } The visual design of the workflow is fairly simple. Here s the big picture: The workflow will start with a WhileActivity, with a CompensatableSequenceActivity as its child. Under the CompensatableSequenceActivity, there will be a ListenActivity with two EventDrivenActivity branches. Each EventDrivenActivity will contain a single HandleExternalEventActivity that listens for an event from the local service. To implement the workflow, first switch to the visual workflow designer view, and then drag and drop a WhileActivity onto the empty workflow. Add a declarative rule condition to the WhileActivity and give it a ConditionName of checkIsComplete. Enter an Expression that checks the value of the IsComplete workflow property like this: !this.IsComplete This condition causes the WhileActivity to repeat its child activity until the IsComplete property is set to true. Next, add a CompensatableSequenceActivity as the direct child of the WhileActivity.

The previous example uses the so-called HTTP Basic authentication mechanism. Looking at the Fiddler screen shot, you might be guessing already that the authentication mechanism is implemented with one HTTP header. In our case, this is the Authorization header. There is a security risk with that authentication mechanism: the user name and password are sent unencrypted over the network! The credentials are not really sent in plain text; they are base64 encoded. That makes little difference as base64 is not an encryption algorithm and anyone can decode the password back. That makes the algorithm vulnerable to replay attacks. A malicious individual can capture the request data and use the Authorization header contents to craft requests that will get authenticated. There is no need for him or her to even decode the actual user name and password all that is needed is providing the correct Authorization header value. Let s play the bad guys and craft a malicious request ourselves: PS> $url = "http://www.pagetutor.com/keeper/mystash/secretstuff.html" PS> $proxy = "http://localhost:8888" PS> $headers = @{"Authorization" = "Basic amltbXk6cGFnZQ=="} PS> .\Get-Url.ps1 -Url $url -Proxy $proxy -Headers $headers <HTML> <HEAD> <TITLE></TITLE> </HEAD>

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