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Up to this point, you have seen workflows that perform only short-lived tasks. You have seen that multiple instances of a workflow can be started by an application, but each workflow exists only in memory, within the workflow runtime engine. While these in-memory workflows are very useful and can be used to accomplish many tasks, they are limited. When the host application or the workflow runtime is stopped, the workflow instances cease to exist. Their lifetime is tightly bound to a single host application. Workflows that exist only in memory are limited in several ways. Workflow persistence means to save the complete state of a workflow to a durable store such as a SQL database or file. Once persisted, the workflow can be removed from memory and reloaded at a later time. Here are some of the reasons to use persistence with your workflows:

Settings for all shells typically are placed in files named profile.ps1 that are located inside the Windows PowerShell install folder. To get to that location in PowerShell, use the $PSHome variable like this: PS> $PSHome C:\Windows\System32\WindowsPowerShell\v1.0 And here is how to add a setting there: PS> $code = "Write-Host 'Hello, all users, all shells'" PS> Add-Content $PSHOME\profile.ps1 $code PS> Note that, because you are modifying a file in the system folder, you have to run the preceding code with administrator credentials and elevated privileges (if running under Windows Vista).

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Figure 4-16. Viewing workflow Tracking Events in the Windows Event Viewer Tracking Records emitted through the ETW Tracking Participant also appear with the appropriate severity level in Event Viewer. This makes it easy to identify any warnings or errors with the execution of the workflow. If you like, you can also view tracking data through the AppFabric extensions. You can select View Tracking Data while inspecting persisted service instances, which will run a SQL query against the monitoring store to produce a list of tracking events for you to view. When you want to track custom events, you can define custom tracking profiles and configure them through the Tracking Profiles option on the main IIS Manager view.

Human interaction tasks: Workflows that are designed to interact with humans are typically long running They may take minutes, hours, days, or weeks to complete It isn t practical to keep such a workflow alive in memory for that length of time Persistence of the workflow provides a way to unload it while it is waiting for the next human event and then reload it when the event is received State machine workflows: These workflows are designed around a set of defined states, with interactions that cause a transition to a different state The kinds of tasks that are modeled with a state machine workflow usually require persistence of the workflow while waiting for the next transition Scalability: In-memory workflows are limited to execution within a single application host To provide scalability, some applications may require multiple workflow runtime hosts, perhaps running on multiple servers.

A persisted workflow can be loaded and executed on a different server than the one that started it Resource consumption: Without a persistence mechanism, workflows must stay in memory They have nowhere else to go If a workflow is waiting for an external input, such as an event, it is actually idle With a persistence mechanism in place, the idled workflow can be persisted and unloaded from memory Once the external event is received, the workflow is loaded back into memory and processing can continue Swapping workflows in and out of memory like this frees resources (memory and workflow threads), making them available for workflows that are actively executing Application flexibility: An in-memory workflow can be executed only by the application that started it.

To create settings for all users of a specific shell, we again have to place a file in the PowerShell install folder. This time, the file is named according to the convention <ShellID>_profile.ps1. In the case of the default shell host, this is Microsoft.PowerShell_profile.ps1. Here is how to add a setting that will take effect for all users running the default shell host: PS> $code = "Write-Host 'Hello, all users of Microsoft.PowerShell'" PS> Add-Content $PSHOME\Microsoft.PowerShell_profile.ps1 $code PS> Just like I mentioned before, you will need administrator credentials and elevated privileges to run the code. How do we get the ShellID value for an arbitrary shell host Doing that is as simple as querying the PowerShell $ShellID variable: PS> $ShellID Microsoft.PowerShell

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