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Declarative Services in .NET 4.0Alan Smith
SDC 2010 – 16th March 2010
Alan Smith
• Developer, Trainer, Mentor, Evangelist– Know IT Consulting
• “Connected Systems Developer” MVP• Microsoft “Connected Technology Advisor”• Contact:– www.CloudCasts.net– geekswithblogs.net/asmith– [email protected]
.NET 4.0 at your Service
• Windows Communication Foundation (WCF)– Simplified Configuration– WS-Discovery– Routing Service– Improved REST support
.NET 4.0 at your Service
• Windows Workflow Foundation (WF)– New workflow runtime– New workflow designer– New activity model– New WCF integration capabilities
.NET 4.0 at your Service
• WCF Workflow Services– Workflow designer used to create WCF services– Workflow exposed through WCF endpoint– Powerful integration with WCF– One of many uses for WF
.NET 4.0 at your Service
• Windows Server AppFabric Application Server Extensions (AppFabric)– Formally “Codename Dublin”– Enhanced WCF and WF hosting capabilities– Workflow persistence– Workflow and service management– Distributed in-memory cache (formally
“Codename Velocity”)
Workflow Service ConceptsConcept Description
Declarative Service implementation is declared using XAML
Persistent State of workflow can be serialized to data store
Long-Running Service lifetime can be longer than first call duration
Durable Service instances can survive host restarts
Classic WCF Service• Client can call methods in any
order• Service is instanced on per-call
basis• Order state is maintained in LOB
Database
[ServiceContract(Name = "OrderManagement")]public interface IOrderManagement{ [OperationContract] void RegisterOrder(Order newOrder); [OperationContract] void ConfirmOrder(Order newOrder); [OperationContract] void CancelOrder(Order newOrder); }
Classic WCF Implementation
Warehouse Database
AppFabric
Order Manager Service
Client
RegisterRegisterId = 123Id = 123
OrderID State
RegisterRegisterId = 456Id = 456ConformConformId = 123Id = 123RegisterRegisterId = 789Id = 789CancelCancel
Id = 789Id = 789ConfirmConfirmId = 456Id = 456
OrderID State
123 Registered
OrderID State
123 Registered
456 Registered
OrderID State
123 Confirmed
456 Registered
OrderID State
123 Confirmed
456 Registered
789 Registered
OrderID State
123 Confirmed
456 Registered
789 Cancelled
OrderID State
123 Confirmed
456 Confirmed
789 Cancelled
Stateful Services – Classic WCF
• Client maintains session with service– Secure session– Reliable session– Transport session
• Service instancing configured appropriately– Per call– Per session– Single
WCF Workflow Service• RegisterOrder creates workflow
instance• Order state is maintained in
workflow instance• ConformOrder or CancelOrder is
then called• Correlation needed between
service calls
Register (123)
AppFabric Persistence Database
AppFabric
Order Manager Service
Client
RegisterRegisterId = 123Id = 123
ConfirConfirmm
CanceCancell
123123
ConfirConfirmm
CanceCancell
123123
Register (456)
AppFabric Persistence Database
AppFabric
Order Manager Service
Client
RegisterRegisterId = 456Id = 456
ConfirConfirmm
CanceCancell
456456
ConfirConfirmm
CanceCancell
123123
ConfirConfirmm
CanceCancell
456456
AppFabric Persistence Database
ConfirConfirmm
CanceCancell
123123
Confirm (123)AppFabric
Order Manager Service
Client
ConformConformId = 123Id = 123
ConfirConfirmm
CanceCancell
123123
ConfirConfirmm
CanceCancell
123123
ConfirConfirmm
CanceCancell
456456
ConfirConfirmm
CanceCancell
123123
Register (789)
AppFabric Persistence Database
AppFabric
Order Manager Service
Client
RegisterRegisterId = 789Id = 789
ConfirConfirmm
CanceCancell
789789
ConfirConfirmm
CanceCancell
123123
ConfirConfirmm
CanceCancell
456456
ConfirConfirmm
CanceCancell
789789
AppFabric Persistence Database
ConfirConfirmm
CanceCancell
789789
Cancel (789)AppFabric
Order Manager Service
Client
CancelCancelId = 789Id = 789
ConfirConfirmm
CanceCancell
789789
ConfirConfirmm
CanceCancell
789789
ConfirConfirmm
CanceCancell
456456
ConfirConfirmm
CanceCancell
123123
ConfirConfirmm
CanceCancell
789789
AppFabric Persistence Database
ConfirConfirmm
CanceCancell
456456
Confirm (456)AppFabric
Order Manager Service
Client
ConfirmConfirmId = 456Id = 456
ConfirConfirmm
CanceCancell
456456
ConfirConfirmm
CanceCancell
456456
ConfirConfirmm
CanceCancell
456456
ConfirConfirmm
CanceCancell
123123
ConfirConfirmm
CanceCancell
789789
Demo…
IIS Manager
AppFabric Hosting ArchitectureVisual Studio
System Centre
IIS / WAS
App Fabric Tools
Runtime Services & Components
Persistence Hosting Monitoring
ASP.NET
WCF ETWWF
SQL Server
Monitoring Persistence
PowerShell
App Cmdlets
Services Going 4ward…
• WCF– Clean migration path for projects and developer
skills– Additional features simplifies configuration and
enhances functionality
Services Going 4ward…
• WCF Workflow Services– New implementation of WF– Will not replace traditional service development
• Evaluate and use where appropriate– Should the service be implemented as a process?
Services Going 4ward…
• Windows Server AppFabric– Great to have for tracing, monitoring and
management of traditional WCF services– Must-have for WCF Workflow Services– Distributed in-memory cache features are
powerful (formally “Codename Velocity”)
Further Development• Bits– Visual Studio 2010 RC– Windows Server AppFabric Beta 2
• Webcasts– www.CloudCasts.net
• Questions– [email protected]
• User Groups– SweNug has many events planned for 2010
• Training– WCF, WF and AppFabric courses at Informator
Tack!
