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The contract defines an interface, not binary compatibility
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It is important to remember that although the contract describes the expected interface, the service and client do not have to implement the same interface; there is no binary compatibility regarding interfaces. All that the interface truly provides is the list of methods (along with the parameter and return types) that must be implemented.
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Up to this point, the discussion has concentrated on the main attributes in the endpoint element in the client section, but some other elements can be used in the endpoint elements. They are the identity section, the headers section, and the metadata section. The identity section relates to the security WCF uses and will be covered in 8, User-Level Security. Defining Endpoint Headers The headers element provides additional information to the endpoint. When defined in the configuration file, the specified elements will be sent along with every request made to the endpoint. The contents of the headers element must be wellformed XML because they are copied into the header section of the request. Consider the following endpoint configuration:
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<system.serviceModel> <client> <endpoint address="http://localhost:8080/UpdateOrder" binding="wsHttpBinding" contract="IUpdateService" name="WSHttpBinding_UpdateOrder"> <headers> <Priority xmlns="http://tempuri.org/">Expedite</Priority> </headers> </endpoint> <endpoint address="http://localhost:8080/CancelOrder" binding="wsHttpBinding" contract="IUpdateService" name="WSHttpBinding_CancelOrder"> <headers> <Priority xmlns="http://tempuri.org/">Standard</Priority> </headers> </endpoint> </client> </system.serviceModel>
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In the preceding example, two client endpoints are created. Associated with each Web service request is a header that indicates the type of reply, the possible values being either Standard or Expedite. Two separate endpoints are configured, either of which can be called by the client. However, the contextual information provided with the request (in the form of the headers) could help the service determine the priority for the request. As will be covered in 12, Concurrency, it is possible to prioritize incoming requests based on contextual data such as the information in the headers section, which could be used to provide the necessary context.
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Client and service need to agree on headers
Headers are one of the instances (of many that exist in WCF) in which the client and service need to be in agreement. If the client configures a set of headers, the service must be configured to receive the same headers. The configuration takes place in the headers element for the service s endpoint definition.
Lesson 1: Configuring the Client Endpoint
Defining Endpoint Metadata The metadata element associated with a client endpoint defines how metadata provided by the service will be processed. Table 5-2 shows the list of metadata processing that can be performed.
Table 5-2
Metadata Processing Elements in the Client Endpoint
Description Defines the types that process the policy information provided by the service s metadata. Defines the types that process the policy information found in the Web Services Description Language (WSDL) associated with a service.
Name policyImporters wsdlImporters
The first step in learning how these elements operate is to understand when they are invoked. The wsdlImporter attribute is used when the proxy class is generated. The type specified in wsdlImporter must implement the IWsdlImportExtension interface. This interface exposes BeforeImport, AfterImport, and ImportContract methods. The WSDL document for the service is available in each of the methods, and the wsdlImporter object can add to or remove from the list of ports, methods, types, and so on that the WSDL exposes. After the ImportContract method is complete, the resulting WSDL is used to create the proxy class. The policyImporter type is similar in structure. The type must implement the IPolicyImportExtension interface. The importer type is responsible for three actions: 1. Locating the custom policy assertion the extension is interested in. This is accomplished by calling one of these methods: GetBindingAssertions, GetMessageBindingAssertions, or GetOperationBindingAssertions. 2. Removing the found policy assertion from the collection of assertions. 3. Modifying the protocol used by the binding or the contract by adding a custom binding element or by changing the contract property of the PolicyConversionContext class. Of these three items, the most important to remember is the second. After all the policy importers have been given a chance to perform their functions, WCF checks to see whether any policy assertions are left in the collection. If there are, the policy import is considered a failure, so if you find and process the policy, make sure it is not left in the collection when you are finished.
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