Base Workflow Services in C#.NET

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Purpose The abstract base class from which all persistence services are derived. The base class that provides methods you can use to manage the workflow queues associated with a workflow instance. The abstract base class from which the workflow runtime core services are derived. The base class for all classes that create threads that run workflow instances on the workflow runtime host. The base class for classes that manage subscriptions for a workflow runtime. The base class for all transaction services. The abstract base class that provides the basic interface between a tracking service and the runtime tracking infrastructure.
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Remember that these are base classes. The services we actually use are derived from these. For instance, when we run a workflow instance, something needs to create a thread for that instance to use. DefaultWorkflowSchedulerService does just that, using WorkflowSchedulerService as its base. But if you want to provide the thread yourself, you can use ManualWorkflowSchedulerService instead. In this chapter, we ll look at the tracking service provided by SqlTrackingService, which has TrackingService for a base class. The pluggable part comes in when you consider that at any given time you might need to use a scheduler service (one that prepares threads for your workflow instance to use), the runtime service, and queueing and subscriptions (timers). But you can add persistence (saving in-progress workflow instances) and tracking, as well as external data communication services. They all just plug in and work together.
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In this chapter, we ll concentrate on the tracking service. Other chapters will look at other available services. Regarding tracking, WF ships with one primary tracking service SqlTrackingService. However, should you need them, there are two additional services available as samples. These services, ConsoleTrackingService and SimpleFileTrackingService, allow you to write tracking information to the console window or to files instead of to a Microsoft SQL Server database. We won t use those services here, but they are available if you need to use them.
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The samples are installed with the Windows SDK see 1, Introducing Microsoft Windows Workflow Foundation for installation instructions. See also the section in this chapter entitled Viewing Tracking Information with WorkflowMonitor for accessing the samples. The tracking services to which I refer, Console and File, are located in the Technologies directory under Tracking.
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Workflow Event Tracking Using SqlTrackingService
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You track your workflow processes by adding a tracking service to the workflow runtime typically, SqlTrackingService. As your workflow instance progresses, it fires events, as do individual activities within your workflow. If you have specific tracking needs, you can create your own user-defined tracking events. If the events that are captured provide you with more tracking data than you require, you can filter the tracked data using a tracking profile you establish. As tracked events fire, WF creates and manages tracking records. Although you re not required to do so, you can easily access the tracking records directly from WF. Note that the information is recorded in the database as well, so retrieving the information directly from the database is also a possibility. Queries for tracking information are normally made at a later date using an external tracking monitor tool, such as WorkflowMonitor (a tracking tool that comes with WF as a sample, with source code) or a tool of your own design. Table 5-2 lists the objects you ll typically use when working with WF event tracking, and we ll use some of these as we progress through the chapter. If all you ever do is use WF s outof-the-box event tracking capabilities, you won t directly use many of the objects shown in Table 5-2, but they will be used by WF on your behalf. However, if you need to customize your workflow s event tracking capabilities, it s nice to know WF provides a strong library of tracking-related objects for you to use.
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