Channels in Visual Studio .NET

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Channels
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message ows from a WCF client application through a client-side channel stack over a given transport to a server The server s channel stack listens for messages and then dispatches them to the server application
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Figure 31 Channel stack
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A channel stack is a series of channels that are con gured using binding elements A precon gured channel stack is also called a binding A binding is made up from a series of binding elements, just as a channel stack is made from a series of channels At the top of the stack are the protocol channels Protocol channels interact with a message and facilitate security, reliable messaging, transactions, and logging features There can be any number of protocol channels in a channel stack, depending on the required features Transport channels are responsible for sending bytes over a transmission protocol such as TCP or HTTP They are also responsible for using an encoder to convert messages into an array of bytes for transport It is the job of an encoder to convert a message from its XML representation to an array of bytes Encoders are exposed to the transport channel using binding elements Transport channels look in the binding context for an implementaclass If none are available, the transport channel tion of a can specify a default message encoder
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Channel Stacks Have a Transport and an Encoder
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Channel stacks have at least one transport and one encoder Usually the transport will specify a default encoding to use An example is the transport channel, which speci es the use of the This is all that is needed to implement a channel stack in WCF Protocol channels are optional when you are composing a channel stack
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WCF supports three distinct message-exchange patterns: one-way, duplex, and request-reply To facilitate each of these patterns, WCF provides ten different interfaces called channel shapes The ve shapes are , , , , and Each of these shapes has an equivalent shape to support , , sessions These include , , and These interfaces implement the different message-exchange patterns within a channel stack In this section, we will look at each of the communication patterns and the various interfaces associated with them
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One-Way Communication Pattern In the one-way communication pattern, messages are sent in only one direction, from the client to the server One-way communication is common when the sender does not need an informational response back right away; the sender just needs an acknowledgement that the message was sent After the message is sent, that is the end of the communication exchange The two interfaces used to facilitate one-way communication are the and the interface Figure 32 shows how messages ow between a client and server for one-way communication interface is responsible for sending In this pattern, the is responsible for receiving messages messages, and the channel Listing 31 shows a client application that uses the shape to send a message
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IOutputChannel
WCF Service
IInputChannel
Messages
Client Application
Server Application
Figure 32 One-way communication
Listing 31
Example
Duplex Communication Duplex communication uses two one-way channel shapes combined as shown in Figure 33 The into a third interface called
3: Channels
advantage of duplex communication over one-way or request-reply is that messages can be sent from either the client or the server
WCF Client
IOutputChannel
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IInputChannel
Messages
IDuplexChannel
IDuplexChannel
Client Application
Server Application
IOutputChannel
IInputChannel
Messages
Figure 33 Duplex communication
An example of duplex communication is an event noti cation system A server will send events to a client that receives events The client provides an endpoint on which the server can send messages to the client The server will then use this endpoint to send messages to the client Listing 32 shows channel shape an example of a client that uses the
Listing 32 Example
Channel Shape s
Request-Reply Communication Request-reply communication is a special form of two-way communication where there is exactly one reply for each request, and it is always initiated by the client After the client sends a request, it must wait for a response before it can send another request A common use of request-reply communication is an HTTP request from a browser The browser makes an HTTP request to the server, such as GET or POST, the server processes that request, and then a reply is sent back and WCF handles request-reply communication using the interfaces as shown in Figure 34