Transcript Windows Communication Foundation

Windows Communication Foundation
Jason Mauer
Microsoft Corporation
November 10, 2005
Agenda
 What is Windows Communication Foundation (WCF)?
 Anatomy
 Programming Model
 Features
 Demos (sprinkled throughout)
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What is Windows Communication Foundation?
 Messaging framework of WinFX
 WinFX = next generation Windows API
 Service-oriented programming model
 Managed API built with .NET
 Implements WS-I standards
 Formerly (and popularly :) known as “Indigo”
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WCF Anatomy
 Endpoint
 Service
 Channel
 Behavior
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WCF Anatomy: Endpoint
 Basic unit of communication
 Represented by ServiceEndpoint class
 Made up of three components
 Address
 Binding
 Contract
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The ABCs of WCF
 Address
 Defines where the endpoint is
 Binding
 Defines how the endpoint communicates
 Contract
 Defines what the endpoint communicates
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The ABCs of WCF
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WSDL
Section
WCF
Term
a.
Where?
service
address
b.
How?
binding
binding
c.
What?
portType
contract
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The ABCs of WCF: Address
 Address components
 URI
 Identity
 Headers (optional)
 Headers differentiate endpoints with the same URI
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The ABCs of WCF: Binding
 Made up of binding elements that describe how the
endpoint communicates
 Transport protocol
 TCP, HTTP, MSMQ, named pipes, etc
 Encoding
 text, Message Transmission Optimization Mechanism (MTOM),
binary
 Security
 asymmetric, symmetric, transport
 Other aspects like message reliability
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Binding Example
 BasicProfileHttpBinding
 Name, namespace uniquely identify binding in service’s
metadata
 HTTP transport, text encoding
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Predefined Bindings
 Interoperable
 BasicHttpBinding – suitable for WS-Basic Profile Web services
(including ASMX)
 WSHttpBinding – for non-duplex services
 WSDualHttpBinding – for duplex service contracts or
communication through SOAP intermediaries
 Optimized
 NetTcpBinding – for cross-machine communication
 NetProfileNamedPipeBinding – for on-machine communication
 Message Queues
 NetMsmqBinding – for communication with WCF applications
 MsmqIntegrationBinding – for existing MSMQ applications
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The ABCs of WCF: Contract
 ContractDescription describes WCF contracts and their
operations
 OperationDescription describes operation aspects
 One way, request/reply, etc
 MessageDescription objects describe messages that make up
an operation
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Contract Definition
 Attribute-based
 Data Contract definition
 Opt-in
 Supports interfaces and classes
 Independent of class access modifiers
 Backward compatibility for existing serialization
definitions
 .NET Serialization
 XML Serialization
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WCF Anatomy: Services, Clients, and Channels
 Service
 A program that exposes a collection of endpoints to
communicate with the outside world
 Client
 A program that exchanges messages with one or more
endpoints using channels
 Channel
 An abstraction of the connection between the client and an
endpoint (and its associated messaging pipeline)
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Services and Channels: Separated at Birth
ServiceDescription
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ChannelDescription
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WCF Architecture
CLR Type
Integration
Transaction
Behavior
CLR Type
Integration
Transaction
Behavior
Security
Channel
Transport
Security
Channel
Transport
Service
Code
Instancing
Behavior
Service Model Layer
Influences and adds to
the programming
model based on
incoming messages
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Messaging Layer
Moves messages back
and forth and adds
transfer semantics
(channels)
WCF Anatomy: Behaviors
 Augments runtime functionality of service/channel
 Throttling is one example
 Behaviors implemented through interfaces
 Services: IServiceBehavior
 Channels: IChannelBehavior
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Hosting WCF
 IIS Hosting
 HTTP only
 Windows Service
 Windows Activation Service (WAS)
 Vista/Longhorn Server feature
 Provides improved manageability
 Self Hosting
 ServiceHost class
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WCF Programming Model
 Simple abstractions with full control under the surface
 Support for custom bindings, transports, encodings, etc
 Built on CLR type system
 Adorn types and methods with attributes
 Extensive support for configuration
 Make changes to services after deployment
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WCF Programming: SvcUtil.exe
 Command-line utility to generate ServiceModel code and
metadata
 Similar to wsdl.exe from .NET Framework
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WCF Features
 Security
 Reliable Messaging
 Queues
 Transactions
 Compatibility
 “InfoCard”
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WCF Features: Security
 Transfer Security
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Integrity – detecting message tampering
Confidentiality – keeping messages private
Authentication – verifying claimed identity
Two modes of support
 Transport mode: uses transport-level protocol (like HTTPS); only point-topoint secure
 Message mode: uses WS-Security; less efficient but secure from end to end
 Standards support
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SOAP Message Security (OASIS)
WS-Trust
WS-SecureConversation
WS-Federation
WS-SecurityPolicy
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WCF Features: Security
 Access Control
 Supports legacy CLR-based security
 PrincipalPermissionAttribute
 Provides an extensible claims-based authorization model
 Auditing
 Logging security-related events to Windows event log
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WCF Features: Reliable Messaging
 Provides for SOAP messages what TCP provides for IP
packets
 Ensures messages are exactly once
 Handles lost messages and duplicates
 Optional ordered delivery
 End-to-end reliability (vs. transport reliability of TCP)
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WCF Features: Queues
 Leverages Microsoft Message Queuing (MSMQ) as a
transport
 Enables loosely coupled applications and disconnected
operations
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WCF Features: Transactions
 Takes advantage of System.Transactions in .NET 2.0
 Supports WS-AtomicTransaction
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WCF Features: Compatibility
 COM+
 Extend COM+ components as Web services
 Service derived from COM+ interface
 Surrogate support if more control over service contract is needed
 COM
 Moniker support (GetObject) for usage of WCF services from
COM-based applications
 Web Services Enhancements (WSE) 3.0
 .NET v1.x WS-I support add-on library
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WCF Features: “InfoCard”
 MS implementation of an Open Identity Metasystem
 Users have portfolio of identities for different contexts
 Goal is consistency and interoperability between current
and future methods of identification
 Built on WS-I standards
 WS-Trust
 WS-MetadataExchange
 WS-SecurityPolicy
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WCF Availability
 WinFX Beta 1 available now
 For .NET Framework v2.0 Beta 2
 WinFX Beta 2 coming soon
 Supports RTM of .NET Framework v2.0
 WinFX RTM with Windows Vista
 also supported on XP and Server 2003
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Other Goodies in WinFX
 Windows Presentation Foundation
 Graphics subsystem
 Vector-based, hardware accelerated
 Declarative programming model
 Windows Workflow Foundation
 Workflow engine
 Upcoming versions of BizTalk and SharePoint are built upon it
 Declarative programming model
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Resources
 MSDN
 WinFX SDK Library
http://winfx.msdn.microsoft.com/library/
 Windows Vista Developer Center
http://msdn.microsoft.com/windowsvista/
 Windows SDK Library
http://windowssdk.msdn.microsoft.com/library/
 WCF Team Blogs
 Don Box
http://pluralsight.com/blogs/dbox/
 Steve Maine
http://hyperthink.net/blog/
 Richard Turner
http://blogs.msdn.com/richardt/
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In Closing
 Q&A
 Reach me at [email protected]
 Thanks!
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