Brian Noyes Chief Architect IDesign Inc. SOA401

Chief Architect IDesign Inc. ( Microsoft Regional Director MVP Microsoft MVP Connected Systems About Brian Publishing Developing Applications with Windows Workflow Foundation, LiveLessons training DVD, June 2007 Smart Client Deployment with ClickOnce, Addison Wesley, January 2007 Data Binding in Windows Forms 2.0, Addison Wesley, January 2006 MSDN Magazine, MSDN Online, CoDe Magazine, The Server Side.NET, asp.netPRO, Visual Studio Magazine Speaking Microsoft Tech∙Ed U.S., Europe, Malaysia, Visual Studio Connections, DevTeach, INETA Speakers Bureau, MSDN Webcasts Blog:

Agenda SOA Overview WF Service Capabilities Exposing WF Workflows as Services Consuming Services from Workflows Workflow 4.0 Coming Changes Workflows in the Cloud

SOA Overview Service Orientation is a way of building composite applications A service is a composable unit of processing and data exposed to consumers Details of the implementation are hidden from the consumer of the service A further abstraction from objects or components

SOA Tenets Services are autonomous Services share schema and contract, not type Services are compatible based on policy Service boundaries are explicit

Workflow as Orchestration Loan Application Process Submit Loan Application Send to Reviewer Fund Application Approve Application Validate Application Notification Service Funding Service Approval Service Validation Service Notification Biz Layer Funding Biz Layer Approval Biz Layer Validation Biz Layer Notification Data Layer Funding Data Layer Approval Data Layer ExchangeSQL dB

Workflow as Service Operation Loan Application Process Debit Account Transfer Funds Credit Account Approve Transfer Debit Manager Fund Manager Credit Manager Authorization Manager Transfer Money

Workflow Coordination Loan Application Process Submit Loan Application Send to Reviewer Fund Application Approve Application Validate Application Loan Approval Process Send to Reviewer Approve Application Validate Application

Agenda SOA Overview WF Service Capabilities Exposing WF Workflows as Services Consuming Services from Workflows Workflow 4.0 Coming Changes Workflows in the Cloud

WF Service Capabilities WF leverages WCF’s ability to define, expose, and call services Interoperable Extensible Productive Complies with SOA tenets

WF Service Capabilities Expose workflows as services Can be clients to services ReceiveActivity Activities as service operation implementation SendActivity Custom activity encapsulating a proxy

WF Service Capabilities WF/WCF supply supporting bindings and hosting capabilities to make it easy to expose the WF service capabilities Bindings: BasicHttpContextBinding NetTcpContextBinding WSHttpContextBinding WorkflowServiceHost

Agenda SOA Overview WF Service Capabilities Exposing WF Workflows as Services Consuming Services from Workflows Workflow 4.0 Coming Changes Workflows in the Cloud

Exposing Workflows as Services Add ReceiveActivity to workflow Set service contract/method properties Bind input parameters/return values Create host application WorkflowServiceHost – self-hosted WorkflowServiceHostFactory – IIS-hosted Use Workflow compatible bindings NetTcpContextBinding BasicHttpContextBinding WSHttpContextBinding

Context Bindings Round trip workflow instance ID in custom header Similar to cookie passing in a browser Uses WCF contexts to store header info Not required to call workflow services, but makes it much easier Automatic routing by workflow runtime to target workflow instance

Multiple Clients per Workflow Will need to extract instanceID from message headers Proxy inner channel context manager

Exposing Workflows as Services

Agenda SOA Overview WF Service Capabilities Exposing WF Workflows as Services Consuming Services from Workflows Workflow 4.0 Coming Changes Workflows in the Cloud

Consuming Services from Workflows SendActivity acts as a WCF proxy Needs service contract interface that it will be calling Needs proxy configuration to specify binding and endpoint information

SendActivity Limitations Default security on NetTcpContextBinding and WSHttpContextBinding are Windows Authentication based on host process identity Default security on BasicHttpBinding is None Can configure a client certificate for certificate authentication in host process app.config No easy way to use username/password or token authentication Solution: custom activity that encapsulates a normal WCF proxy

Consuming Services from Workflows

Agenda SOA Overview WF Service Capabilities Exposing WF Workflows as Services Consuming Services from Workflows Workflow 4.0 Coming Changes Workflows in the Cloud

What’s New in 4.0? Specific to Services SendMessage / ReceiveMessage activities replace Send/Receive activities Better integration with WCF capabilities Easier correlation for calls between workflows Across WF...?TONS!

Agenda SOA Overview WF Service Capabilities Exposing WF Workflows as Services Consuming Services from Workflows Workflow 4.0 Coming Changes Workflows in the Cloud

Set of new activities for integrating with Cloud Services Run workflows in the cloud Scalable, robust, reliable infrastructure for running workflows

Workflows in the Cloud Child Workflow Parent Workflow Invoke Sub-Process Aggregate Results Notify Client Start Process Step 1 Step 2 Client App

Summary WF fits nicely into the future of cloud computing WF fits nicely into the SOA picture with.NET 3.5 and 4.0 capabilities Consider WF for front-end service coordination (orchestration) Consider WF for service-processing implementation Can be used for workflow–workflow coordination

Resources IDesign WF Master Class Developing Applications with Windows Workflow Foundation, Brian Noyes, LiveLesson training DVD Essential Windows Communication Foundation (WCF): For.NET Framework 3.5, Resnick, Crane, Bowen, Addison Wesley Pro WF, Bruce Bukovics, Apress Essential Windows Workflow Foundation, Dharma Shukla and Bob Schmidt, Addison Wesley, &rl= &rl=1 Blog:

Track Resources Required Slide Track PMs will supply the content for this slide, which will be inserted during the final scrub. Required Slide Track PMs will supply the content for this slide, which will be inserted during the final scrub. SOA msdn.microsoft.com/biztalk “Dublin” “Oslo” msdn.microsoft.com/oslo msdn.microsoft.com/wcf msdn.microsoft.com/wf msdn.microsoft.com/azure/netservices twitter.com/dotnetservices

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