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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.

Important The Smart Card Logon and Client Authentication OIDs must be valid in the entire certificate chain.

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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.

Planning for disaster or emergencies is not a single step, but an iterative, ongoing process. Systems are not mountains, but rivers, constantly moving and changing, and your disaster recovery plan needs to change as your environment changes. To put together a good disaster recovery plan one you can bet your business on you need to follow these steps: 1. Identify the risks. 2. Identify the resources. 3. Develop the responses. 4. Test the responses. 5. Iterate.

The first step in creating a disaster recovery plan is to identify the risks to your business and the costs associated with those risks The risks vary from the simple deletion of a critical file to the total destruction of your place of business and its computers To properly prepare for a disaster, you need to perform a realistic assessment of the risks, the potential costs and consequences of each disaster scenario, the likelihood of any given disaster scenario, and the resources available to address the risks Risks that seemed vanishingly remote a few years ago are now part of our everyday life Identifying risks is not a job for only one person As with all the tasks associated with a disaster recovery plan, all concerned parties must participate.

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.

A Windows Server 2003 Enterprise Edition CA meets these requirements. Alternatively, a third-party CA can issue a smart card certificate, as long as the requirements are met. The requirements are detailed in Microsoft Knowledge Base Article 281245, Guidelines for Enabling Smart Card Logon with Third-Party Certification Authorities. referenced in the "Additional Information" section at the end of the chapter.