c# generate data matrix DEPLOYING WORKFLOW APPLICATIONS in Visual C#.NET

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CHAPTER 9 DEPLOYING WORKFLOW APPLICATIONS
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static void OnWorkflowIdled(object sender, WorkflowEventArgs e) { Console.WriteLine("Workflow is idle."); ThreadPool.QueueUserWorkItem(UnloadInstance, e.WorkflowInstance); } static void UnloadInstance(object workflowInstance) { ((WorkflowInstance)workflowInstance).TryUnload(); } static void OnWorkflowCompleted(object sender, WorkflowCompletedEventArgs instance) { waitHandle.Set(); } Make sure the following Handlers are defined within the void Main: workflowRuntime.WorkflowCompleted += OnWorkflowCompleted; workflowRuntime.WorkflowIdled += OnWorkflowIdled; workflowRuntime.WorkflowPersisted += OnWorkflowPersisted; workflowRuntime.WorkflowUnloaded += OnWorkflowUnloaded; workflowRuntime.WorkflowLoaded += OnWorkflowLoaded; workflowRuntime.WorkflowTerminated += OnWorkflowTerminated; Add a Code activity to the workflow, leaving the name the default and generating the Handlers. Within the Handler add the following: Console .Write ("First Activity: " + DateTime .Now); Next, add a Delay activity with a timeout duration property set to 30 seconds. Add another Code activity to the workflow, leaving the name the default and generating the Handlers. Within the Handler add the following: Console .Write ("Second Activity: " + DateTime .Now); Execute the workflow, and you ll see the workflow going idle, persisting its data, unloading, loading again, and displaying the correct time. Using a Delay activity is the first way to force a workflow to go idle and persist its data. The other way is to call the Unload method of the workflow instance. By default, this method uses the Persistence Service associated with the workflow to take the workflow instance out of memory and save the state of the workflow. You can then use the GetWorkflow method of the workflow runtime and the Load method of the workflow instance to load the correct instance of the workflow up again. To see how this might work, add a Suspend activity after the Delay activity but before the second Code activity. Execute the workflow. You ll see the workflow get unloaded, persist, and load up again. Then the workflow will stop. Open a new query into the SQLPersistenceDatabase and execute Select * from instancestate. You ll see there s a uidinstanceid column that has a GUID representing the workflow instance.
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CHAPTER 9 DEPLOYING WORKFLOW APPLICATIONS
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This chapter has covered how to deploy a workflow application, and also how to persistent the workflow data. The next chapter will use all the knowledge learned in the previous chapters to build a real-world application. The application will be an ASP.NET-based employee performance review application that uses workflow.
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he previous chapters first introduced you to workflow, then described the various activities that can be added to a workflow, and finally discussed custom activities. The previous chapters also covered how to interact with workflow from other applications. This chapter will bring together all the concepts learned in the previous chapters to build a real-world application: an Employee Performance Review workflow application.
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Workflow Design
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As with any software development project, the first step is to understand the requirements of the system. The first step in understanding the requirements is to understand the business process. In general, a workflow application models a business process. You must define that process so it can be modeled. Once you define the business process, you can create a model to show the project stakeholders those that use the process to make sure the process was captured correctly. After the process is modeled, you need to determine which type of workflow to use (Sequential or State Machine). Finally, you need to select and model all the activities that will be used. At the end of this process, a model will exist that models the process and also allows you to begin immediately with constructing the necessary activities.
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The first step in developing a workflow application is to define the business process. Here s the business process this application facilitates: 1. Employee begins a self-review. For each review, the employee s name, location, supervisor, title, and department must be known. 2. Employee provides a summary of activities for the previous year. 3. Employee rates himself or herself on various criteria, and provides a summary for each criterion. 4. Employee provides overall rating of self.
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