Workflow Services Integration of WCF and WF

1. Workflow ServicesIntegration of WCF and WF PhaniKumar M T Technical Architect | BrainScale Consulting phani@brainscale.com

2. Session Objectives and Takeaways • Why Workflow Services? • Architectural overview of Workflow Services • Features • Context Exchange • Durable Services • Duplex Workflow Services • Conversations

3. Agenda • A Typical Application Architecture • Architecture of WF Services • Features • Context Exchange • Durable Services • Duplex Workflow Services • Conversations • Prerequisites: • Basic Understanding of WF and WCF

4. A Typical Application Architecture

5. Windows Workflow Foundation What is Workflow? Visual Studio Designer A Workflow Workflow is the organization of work Activity Activity Library What’s the value of Workflow? Long Running Logic Workflow Runtime Engine Flexibility Runtime Services Transparency Host Process

8. Workflow ServicesAdvantages • Service implemented as Workflow • Leverage Workflow development experience • Enforces application protocol by default • Allows long-running, durable Services • Workflow hosted as Service • ServiceContract provides typed interface for integrating with the Workflow • Messages enforce by-value, serializable data • Workflows can be message-activated

9. DEMO First Look at Workflow Services

10. Bindings • NetTcpContextBinding • WSHttpContextBinding • BasicHttpContextBinding • <Your Binding Here> • Create a custom binding and insert the ContextChannel into the Channel Stack

11. Custom Context Binding <customBinding> <binding name="namedPipeWithContext"> <context /> <binaryMessageEncoding /> <namedPipeTransport /> </binding> </customBinding>

12. Session Objectives and Takeaways • Why Workflow Services? • Architectural overview of Workflow Services • Features • Context Exchange • Durable Services • Duplex Messaging • Conversations

14. Context Exchange Architecture • ContextChannelimplemention • Receive • Extract context to ContextMessageProperty • Apply context on response to activating request • Send • Add context to all outgoing messages • Representation of context • SOAP header <wsc:Context /> • HTTP cookie • In code: IDictionary<XmlQualifiedName, string> WorkflowOperationInvoker Service Runtime DurableInstanceProvider MessageContextInspector OperationInvoker OperationSelector ContextChannel ListenerChannel InstanceProvider MessageInspector

15. Setting Outgoing Context • // inside wf code application • IDictionary<XmlQualifiedName, string> context; • // context = … obtain context from store • sendActivity.Context = context; • //also, to dynamically set send address • sendActivity.CustomAddress = • “net.tcp://140.141.2.5/service.svc”;

16. demo Context Exchange, Persistence and Management

17. Non WF Client Access to Context • // my wpf application • IDictionary<XmlQualifiedName, string> context; • // context = … obtain context from store • IContextManager cm = • proxy.InnerChannel.GetProperty<IContextManager>(); • if (null != cm) • cm.SetContext(context); • // need to use a channel stack which includes the • // context channel, or write the headers directly into • // the message (non-WCF) client

18. Session Objectives and Takeaways • Why Workflow Services? • Architectural overview of Workflow Services • Features • Context Exchange • Durable Services • Duplex Messaging • Conversations

19. Durable Services Architecture Persistence Provider Service.cs Service Instance Service Runtime App.config ServiceHost DurableInstanceProvider Operation 1 OperationInvoker MessageContextInspector Operation 2 OperationSelector InstanceProvider ContextChannel ListenerChannel MessageInspector DurableServiceBehavior ServiceDescription DurableOperationBehavior ServiceBehavior OperationBehavior

20. demo Durable Services

21. Session Objectives and Takeaways • Why Workflow Services? • Architectural overview of Workflow Services • Features • Context Exchange • Durable Services • Duplex Messaging • Conversations

23. demo Duplex Messaging

24. Session Objectives and Takeaways • Why Workflow Services? • Architectural overview of Workflow Services • Features • Context Exchange • Durable Services • Duplex Messaging • Conversations

25. Conversations • Multiple messages arriving for the same operation • Receives operating in parallel • Scenarios • Bidding • Coordinating approvals

29. demo Conversations

30. So, does the integration make sense?

31. Summary • WF and WCF developers benefit from these two worlds coming together • Workflow Services provide a natural way to model services • With an understanding of context, advanced communication patterns can be implemented across many parties.

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33. Contact • You can visit us at: www.brainscale.com • Email Address phani@brainscale.com