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POWorkflow Foundation 4, Best way to execute Workflow
 

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    <p>Before asking a question, and before you all get mad because there are a couple of similar questions, I would like to explain a bit what are project requirements. You will see that question differs from all others.</p> <ul> <li>Users will create workflows using ReHosted WPF application and upload xaml files to web application we will provide.</li> <li>Entry points to start workflow execution is in that web application. They can use UI or consume API function from their own application.</li> <li>Workflows will be long-running.</li> </ul> <p>I'm aware of different possibilities for hosting. </p> <p>Simplest would be to host it <strong>within ASP.NET web application</strong>, but as we are not aware what kind of workflows users will upload, IIS AppDomain recycling could break workflow thread execution.</p> <p><strong>WCF Workflow Services</strong> look nice, but the fact users will upload their own xaml workflow definitions makes things more complicated. Looks like we would have to create something like <em>core</em> workflow, exposed as WCF service, and that workflow will load and execute inner workflow (xaml customers uploaded). Not sure how in parameters would be passed to inner workflow in that case.</p> <p>Third option, and the one looking best to me, is hosting workflow execution in <strong>Windows Service</strong>. Communication between web application and window service can go over MSMQ. Downside of this solutions is maybe boylerplate code to ensure good communication between web app and win service.</p> <p>Am I missing better solution? In case you need more details, just post a comment.</p>
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