Serializable Call Context Data in .NET

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Listing 9-17 Serializable Call Context Data
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[Serializable] public class UserInfo : ILogicalThreadAffinative { private string username; private string password; public string Username { get { return username; } set { username = value; } } public string Password { get { return password; } set { password = value; } } }
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Within the method of the serviced component, the call context can be accessed by using theCallContext class, as shown inListing 9-18 The method Getdata requires a string to identify the value that is passed with the call context, and returns the call context data The returned object must be cast to the UserInfo class that was defined inListing 9-17
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Listing 9-18 Accessing the Call Context in the Serviced Component
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public void CallContextDemo() { UserInfo userInfo = (UserInfo)CallContextGetData("authenticationInfo"); // Use the user information }
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Listing 9-19 shows the assembly attributes that must be defined for the serviced components to be accessed by NET remoting With the attribute Application-ActivationAttribute, the named parameterSoapVRoot must be set, which defines the name of the virtual directory of the ASPNET Web site that acts as a host for the serviced components
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Listing 9-19 Assembly Attributes for NET Remoting Access
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[assembly: ApplicationName("CourseManagement")] [assembly: ApplicationActivation(ActivationOptionServer, SoapVRoot="CallContextDemo")] [assembly: ApplicationAccessControl(false)]
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After registering the Enterprise Services application using the command-line utility regsvcsexe, and after installing the assembly into the global assembly cache, you must manually change the configuration file that was automatically generated by the registration process You must do so to allow the security to pass the call context data from the client to the server Listing 9-20 shows the configuration file webconfig that you can find in the directory <windir>system32\com\SOAPVRoots\CallContextDemo The major part of the configuration file is generated automatically, but starting with NET 11, the call context may not be passed across the channels with the default configuration For the server providers that are used with the serviced components (by default the HTTP channel has the SOAP formatter associated with it), you must set the attribute typeFilterLevel to the value Full The providers are used with a channel, so you must add the <channels>, <channel>, <serverProviders>, and <provider> elements accordingly
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Listing 9-20 Webconfig File to Allow Passing the Call Context
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< xml version="10" encoding="utf-8" >
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<configuration> <systemruntimeremoting> <application> <service> <wellknown mode="SingleCall" type="SamplesCoursesStateDemo, SamplesCourses, Version=10147840545, Culture=neutral, PublicKeyToken=e151efac3427f14b" objectUri="SamplesCoursesStateDemosoap" /> </service> <channels> <channel ref="http"> <serverProviders> <provider ref="wsdl" /> <provider ref="soap" typeFilterLevel="Full" /> </serverProviders> </channel> </channels> </application> </systemruntimeremoting> </configuration>
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After you have configured all of these settings, the client application can create a channel and register the remote object with the NET remoting runtime to call the method of the serviced component The call context can be passed by calling the SetData method of the CallContext class, as shown inListing 9-21 The first parameter of the method defines the name of the call context data The call context is passed automatically with the call to the CallContextDemo method
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Listing 9-21 Passing the Call Context with the Client Application
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HttpChannel channel = new HttpChannel(); ChannelServicesRegisterChannel(channel); RemotingConfigurationRegisterWellKnownClientType( typeof(StateDemo), "http://localhost:80/CallContextDemo/" + "SamplesCoursesStateDemosoap"); StateDemo obj = new StateDemo(); UserInfo userInfo = new UserInfo(); userInfoUsername = textUsernameText; userInfoPassword = textPasswordText; CallContextSetData("authenticationInfo", userInfo); objCallContextDemo(); objDispose();
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This chapter covered the importance of state management with a distributed solution Enterprise Services offers a mechanism called Shared Property Manager to deal with state, although you can also put state in the client application and in a Web service, if the Web service is a fa ade for accessing the serviced components You can also put state into the database, into files, or into Active Directory Active Directory has a specific requirement that the information put into it should mainly be used for read activities, but should not be changed often With ASPNET Web services, you can make use of the features of the ASPNET runtime to put state into the session or the cache This chapter also examined accessing the ASPNET state from within serviced components One option not to forget is keeping state in the client application In this scenario, not only do you have the option to pass this data with arguments of the serviced component methods, but you can also use the SOAP header or the NET remoting call context These topics show that with the design of the solution, you must analyze the data according to durability, volatility, speed, lifetime, affinity, and size requirements so that you can decide where to put the state
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Just in time activation is shown in 2, "Object Activation and Contexts" Accessing serviced components with NET remoting is discussed in 5, "Networking" Synchronization is discussed in 3, "Concurrency" Professional C#, 3rd Edition, has a chapter dedicated to the Active Directory ( 24) This is the default timeout value, but it can be configured to a different value Wsdlexe uses the WSDL documentation of the Web service to create a proxy client class Wsdlexe is used in 5 NET 20 and SQL Server also enable you to automatically invalidate the cache when a value in the database changes With NET 11, such a behavior must be done manually (for example, by creating a trigger in the database) Using NET remoting with serviced components is discussed in 5
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