Message Contracts in .NET

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Message Contracts
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Message contracts are operation contracts that enable access to SOAP heador ers and bodies Messages can be typed with , or they can simply be of the type Typed messages are and attributes Message data de ned with [ can be unde ned at design time, enabling the greatest exibility Untyped messages also have access to the SOAP headers and body
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Channels
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through which all messages pass to and from WCF applications It is responsible for preparing and delivering messages in a consistent way Channels are de ned for transports, protocols, and message interception Channels are layered together to create a channel stack A channel stack is a layered communication stack that processes messages For example, a channel stack could be constructed using a TCP transport channel and a transaction protocol channel Such a channel stack would allow sending and receiving messages across a network using the TCP protocol and transactions to ow from client to server The goal of a channel stack is to transform a message into a wire format compatible with the sender and receiver and to transport the message There are two types of channels that are used to do this: transport channels and protocol channels Transport channels always sit at the bottom of the channel stack and are responsible for transporting messages using a transport protocol WCF provides a number of transport protocols, including HTTP, TCP, MSMQ, peer-to-peer, and named pipes Protocol channels reside on top of transports or other protocol channels Because protocol channels reside on top of other channels, they are often referred to as layered channels Protocol channels are responsible for implementing wire-level protocols by transforming and modifying messages WCF provides many types of protocol channels Examples include protocol channels that implement support for security, transactions, and reliable messaging
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CHANNEL IS THE CONDUIT
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3: Channels
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Transport Channels
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WCF provides several transport channels, including HTTP, TCP, MSMQ, peer-to-peer, and named pipes Other transports are available in sample code or through third parties for a wide range of transports, including SMTP, FTP, UDP, WebSphere MQ, and SQL Service Broker Many of these transports can be found on the http://wcfnetfx3com Web site The UDP transport channel can be found in the Windows SDK The transport channel for WebSphere MQ can be found on IBM s alphaWorks Web site
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For communication to occur, clients and servers each need to instantiate a channel stack that is compatible with others Between NET applications, this is typically done by using the same channel stack on the client and the server In general, this means that their capabilities must match We use bindings to simplify the creation of channel stacks A binding captures the con guration of the channel stack and knows how to create that channel stack at runtime Bindings are built from a collection of binding elements, which typically represent channels in the channel stack Bindings and binding elements will be discussed in detail in 4, Bindings The WCF channel architecture provides enormous exibility by allowing the communication to be abstracted away from the application This enables developers to build services that can be exposed over multiple communication mechanisms, which allows application services to change over time as the requirements change For example, a WCF service exposed between two NET applications can easily be exposed to a Java application without modifying the application Support for additional features such as interoperability, durable messaging, and transactions can easily be added to WCF services as the requirements change Prior Microsoft technologies (such as ASPNET Web Services, NET Remoting, Enterprise Services, or MSMQ) required you to rewrite portions of the application for each new form of communication With WCF, you can now pick and choose the features you want without requiring a signi cant rewrite of the application The capability for WCF to offer such exibility can be found in how WCF composes a channel stack using layering Figure 31 shows how a
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