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System.Net.WebClient class uses System.Net.WebRequest internally, and we can certainly do that too. We need to create a new WebRequest object by passing the URL in the constructor, set its Method property to HEAD, and check the response status code. If the code is different than 200 (OK), we will get an error that we need to trap. We will save that piece of functionality in a reusable script that we will call Test-Url.ps1. Here is the code: param ($url) trap { Write-Host $_ #clean up the current request $request.Abort() #an error occurred. ignore it and continue to returning false. continue } $request = [System.Net.WebRequest]::Create($url) $request.Method = "HEAD" $request.TimeOut = 5000 if ($request.GetResponse().StatusCode -eq "OK") { #clean up the current request $request.GetResponse().Close() return $true } #should get here only if we got an error for our web request return $false The line that will raise an error if the server or file does not exist is the one containing the GetResponse method call. If that happens, the error will get suppressed by our trap, and execution will continue after the if statement. That will make the script return $false. Otherwise, we will execute the return statement inside the if body, and that will exit the script returning $true. It is very important that we close the response when we are done and, just in case, abort the request if an error occurs. If we do not do that, we will end up with a bunch of hung requests that have not been cleaned up. It seems that the WebRequest class uses an internal connection pool and failing to properly clean up will cause subsequent requests to fail. Finally, here is how we can use the script: PS> .\Test-Url.ps1 http://www.google.com True PS> .\Test-Url.ps1 http://www.google.com/nosuchfile False PS> .\Test-Url.ps1 http://www.googlec.om/ False

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namespace Bukovics.Workflow.Hosting { /// <summary> /// A wrapper class to manage workflow creation /// and workflow runtime engine events /// </summary> public class WorkflowRuntimeManager : IDisposable { private WorkflowRuntime _workflowRuntime; private Dictionary<Guid, WorkflowInstanceWrapper> _workflows = new Dictionary<Guid, WorkflowInstanceWrapper>(); /// <summary> /// Constructor /// </summary> /// <param name="instance"></param> public WorkflowRuntimeManager(WorkflowRuntime instance) { _workflowRuntime = instance; if (instance == null) { throw new NullReferenceException( "A non-null WorkflowRuntime instance is required"); } //subscribe to all workflow runtime events SubscribeToEvents(instance); } The class defines two instance variables. The _workflowRuntime variable holds a reference to the WorkflowRuntime instance that is passed to the constructor. The _workflows variable is a Dictionary of WorkflowInstanceWrapper objects keyed by the workflow instance Guid. Both of these variables are also exposed as public properties. During construction, the SubscribeToEvents method is executed to add handlers for the WorkflowRuntime events.

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/// <summary> /// Create and start a workflow /// </summary> /// <param name="workflowType"></param> /// <param name="parameters"></param> /// <returns>A wrapped workflow instance</returns> public WorkflowInstanceWrapper StartWorkflow(Type workflowType, Dictionary<String, Object> parameters) { WorkflowInstance instance = _workflowRuntime.CreateWorkflow( workflowType, parameters); WorkflowInstanceWrapper wrapper = AddWorkflowInstance(instance); instance.Start(); return wrapper; } The StartWorkflow method is used to create and start a workflow. This method expects two arguments: the Type of the workflow to start and a Dictionary containing any input parameters. The WorkflowInstance that is returned from the CreateWorkflow method is wrapped in a WorkflowInstanceWrapper by the AddWorkflowInstance private method. After constructing a WorkflowInstanceWrapper, the AddWorkflowInstance method adds it to the Dictionary of workflows. #region Public properties and Events /// <summary> /// Get the WorkflowRuntime instance /// </summary> public WorkflowRuntime WorkflowRuntime { get { return _workflowRuntime; } } /// <summary> /// Get a Dictionary of workflow instance wrappers /// </summary> public Dictionary<Guid, WorkflowInstanceWrapper> Workflows { get { return _workflows; } } /// <summary> /// Event for logging messages from this class /// </summary> public event EventHandler<WorkflowLogEventArgs> MessageEvent; #endregion A public event named MessageEvent is also defined. This event is raised from the WorkflowRuntime event handlers. It is designed to pass a formatted String message to the host application. The host application can then choose to display the message on the console or handle the message in some other way.

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OK, if you actually followed all these steps on your local computer (not just in your mind), then you now know how to install AppFabric and how to verify the proper configuration of all its components. For those of you who preferred to read this chapter instead of using it as a manual when performing the installation of AppFabric yourself, we hope this chapter has provided sufficient information for planning the steps required to install AppFabric in your environment when the time comes.

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