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At this point, we have the core Web service operations implemented and working However, there s still a lot of work to be done We must secure the Web service so that only registered users with the appropriate permissions can access each of the methods We must also modify the standard, auto-generated, documentation page to inform users that registration is required and give them a link to the registration page We also need to implement a usage tracking system so that we can monitor the usage for each user and, possibly, bill for that usage As you can see, a typical Web service requires substantial infrastructure Instead of building security and usage accounting from scratch we will simply use the infrastructure SOAP extensions from chapter 10 To reuse the infrastructure SOAP extension from chapter 10, you first need to add a reference to infrastructuredll (the assembly that contains the SOAP extensions) You then add an Import statement for the namespace LearnXmlWSWebServicesInfrastructure as shown in listing 13-5 Listing 13-5 Adding SoapHeader attribute to GetTemperature and GetWeather as part of implementing authorization (VBWSBook\13\Weatherasmxvb)

People often ask: Is SCA a technology for Service-Oriented Architecture (SOA) The answer is, it depends The problem is that SOA has been hyped to such a degree and means so many different things that it has become virtually useless as a way of characterizing a technology For some, SOA involves writing applications as discrete units of functionality that interoperate regardless of the language they are implemented in In other words, SOA relies on interoperable web services that are highly autonomous For others, SOA is a design pattern for organizing an application as units that interact via contracts Contrary to the rst view, these units may not be autonomous SCA aligns more closely with the latter than the former In other words, SCA is a technology for assembling applications from services that are managed by a common infrastructure To be sure, SCA services may use interoperable protocols and

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With component-managed sign-on, an application component is responsible for passing the security information that is needed for signing on to the resource to

Imports LearnXmlWSWebServicesInfrastructure <SoapDocumentService( _ RoutingStyle:=SoapServiceRoutingStyleRequestElement), _ WebService(Namespace:="http://wwwlearnxmlwscom/WeatherService"), _ WebServiceBindingAttribute("WeatherInterface", _ "http://wwwlearnxmlwscom/WeatherService ")> _ Imports LearnXmlWSWebServicesInfrastructure Public Class Weather Inherits SystemWebServicesWebService

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communicate with other services not managed by that common infrastructure, but those are not requirements mandated by SCA It s likely that many, maybe even most, SCA services will be accessible only by software running on infrastructure provided by the same vendor Is this SOA It depends on your perspective What really matters is that the bene ts and trade-offs associated with SCA are clearly understood To avoid becoming bogged down in terminology, we consciously avoid the label SOA and simply describe SCA as service-based As we explain in this section, SCA has a very speci c de nition of a service, so this will help avoid the confusion caused by the vagueness of SOA

'The session id Public sessHdr As SessionHeader <WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _ Action:="", _ ParameterStyle:=SoapParameterStyleBare), _ SoapHeader("sessHdr", _ Required:=True, Direction:=SoapHeaderDirectionIn)> _ Public Function GetTemperature( _ <XmlElement("TemperatureRequest")> ByVal ZipCode As String) _ As <XmlElement("Temperature")> Single Return WeatherInfoGetTemperatureFromZip(ZipCode) End Function

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<WebMethod(), _ SoapDocumentMethod( _ Binding:="WeatherInterface", _

the method Security information could be a user name and password, for example, as shown in the following example

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