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Listing 415 Host Configuration
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Communication Using Advanced Web Ser vice s
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Listing 416 shows the client con guration to consume the service using binding shown in Listing 415 the
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Listing 416 Client Configuration
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The binding is similar to the binding, with additional support for duplex communication and lack of support for transport-level security Duplex communication is accomplished through and two shape-changing binding elements: the binding elements The binding element layers a duplex communication binding channel on top of two one-way channels The binding element This transport uses the supports only the request-reply message exchange pattern The binding element allows the binding element to be used with the binding element
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4: Bindings
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The binding does not support transport-level security This means that SSL/TLS encryption is not possible using the binding The following code shows the addressing formats for the binding
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The default port is port 80 for http This is the case for any binding based binding element, including the on the binding Table 410 lists the binding properties that are con gurable on the binding
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Table 410 Attribute Name
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Binding Properties Description Default
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Bypass the proxy settings for local endpoints
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false
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The maximum time to wait for 00:01:00 the connection to be closed Speci es the method for hostname comparison when parsing URIs Maximum size of any buffer pools used by the transport The maximum size of an incoming message The type of encoding used to encode messages The name of the binding The maximum time to wait for an open connection operation to complete 00:01:00 StrongWildCard
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524,888 65,536 Text
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Communication Using Advanced Web Ser vice s
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Attribute Name Description Default
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Specify a speci c Web proxy to use must be false for this setting to apply Specify the complexity of messages that can be processed (for example, size) The maximum time to wait for a receive operation to complete Specify whether the binding supports exactly once delivery assurances using WS-Reliable Messaging Speci es the security settings of the binding The maximum time to wait for a send operation to complete Determines how messages are sent across the network Messages can either be buffered or streamed Enable transactions to ow from the client to the server Use the default Web proxy speci ed by the operating system
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00:01:00 n/a
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n/a 00:01:00 utf-8
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false true
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We have modi ed the application for the binding to support duplex communication Listing 417 shows the implementation The service supports the duplex contract, which is message exchange pattern using the contract the callback contract speci ed for the
4: Bindings
Listing 417 , , and
Communication Using Advanced Web Ser vice s
We must change the self-hosting code for our example because we changed the implementation that we are using to one that supports duplex messaging Listing 418 shows the hosting code for the service
Listing 418 Service
The con guration information shown in Listing 419 exposes the service using the binding
Listing 419 Host Configuration
4: Bindings
Listing 419 continued
The con guration information shown in Listing 420 is for the client to contract using consume a service based on the binding The speci es the endthe point on which the client will listen for callback messages
Listing 420 Client Configuration
The client application is shown in Listing 421 The client implements interface to receive callback mesthe sages from the service The client application passes a reference to the interface using the class The class is passed to the constructor of the client proxy
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Listing 421 Client Application
Listing 422 shows the client proxy generated by The big difference between this client proxy and the previous implementation is
4: Bindings
that the client derives from the class The messaging
Listing 422 Client Proxy
class rather than the class adds support for duplex
Communication Using Advanced Web Ser vice s
4: Bindings
Comparing Binding Performance and Scalability
Developers need to know about the performance and scalability characteristics of bindings Performance and scalability are important when you are working with real-world applications where service-level agreements and user experience matters Users will complain about an application that performs poorly Applications that do not scale usually mean that business objectives are not being met We have provided a simple performance comparison of four bindings available in WCF The operation under test is a simple operation that returns a 256-character string Listing 423 shows the service being used to compare performance between each binding
Listing 423 Performance Test Service
The service was exposed over four different bindings: , , , and A test client called the Get256Bytes operation 50,000 times sequentially to compare the differences between the bindings We then measured the average elapsed time, operations per second, and CPU time All tests were performed on a single workstation running both server and client This was done so that we could compare the performance of all the bindings Figure 43 shows the average response time for each binding You can use the response-time measurement to help examine user experience