AssemblyInfocs to Configure NET Remoting in .NET

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Listing 5-2 AssemblyInfocs to Configure NET Remoting
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// AssemblyInfocs [assembly: AssemblyDelaySign(false)] [assembly: AssemblyKeyFile("////mykeysnk")] [assembly: AssemblyKeyName("")] [assembly: ApplicationName("Networking Demo")] [assembly: Description("Sample Application")] [assembly: ApplicationActivation(ActivationOptionServer, SoapVRoot="RemotingDemo")]
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Turning Off Security with the Enterprise Services Application
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With the trustworthy computing initiative by Microsoft and Windows Server 2003, there is another important aspect when using NET Enterprise Services and SOAP services You have to be aware that NET remoting does not offer security by itself with NET version 10 or 11 Microsoft put a lot of effort into making Windows Server 2003 more secure, and part of the trustworthy computing initiative was to reduce possibilities that the system can be made insecure by wrong administrative decisions: better safe than sorry Windows XP has a different behavior with Enterprise Services and SOAPhere security can be turned off unintentionally by turning on NET remoting with Enterprise Services With Windows XP, you can configure the serviced component to require security, but this security requirement is just invalidated by turning on SOAP If you turn on SOAP with Windows XP and use the default settings, any client can
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access the serviced component by using NET remoting, regardless of whether client access should be allowed by the security configuration of the component [14] Windows Server 2003 makes it easy to use SOAP services across a secure channel However, this chapter has not yet dealt with security issues, so every client should be given access to the serviced components with SOAP To make this happen, you have to turn off security for the Enterprise Services application You do this partly by using attributes in the code, but you also have to configure security relevant items of Web site within IIS In the previous examples, with the assembly attribute ApplicationAccess-Control, access control was already turned off; but now authentication and impersonation should be turned off, which can be done by using the named properties Authentication and ImpersonationLevel: [assembly: ApplicationAccessControl(false, Authentication=AuthenticationOptionNone, ImpersonationLevel=ImpersonationLevelOptionAnonymous)]
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Serviced Component Class
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Similar to the examples that have been shown earlier in this chapter and in 4, you will create a few classes to look at how data can be passed with NET remoting The class RemotingDemo is the implementation of the serviced component; CourseInfo is a class that is serialized across the network Both of these classes are shown in Listing 5-3
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Listing 5-3 Serviced Component Application to Be Used with NET Remoting
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using System; using SystemEnterpriseServices; using SystemWindowsForms; namespace DemosNetworking { [Serializable] public class CourseInfo { public CourseInfo(string number, string title, int length, DateTime date) { thisnumber = number; thistitle = title; thislength = length; thisdate = date; } private string number; public string Number { get { return number; }
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} private string title; public string Title { get { return title; } } private int length; public int Length { get { return length; } } private DateTime date; public DateTime Date { get { return date; } } }
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[EventTrackingEnabled] public class RemotingDemo : ServicedComponent { public RemotingDemo() { } private CourseInfo course; public CourseInfo GetCourse() { if (course == null) { course = new CourseInfo( "MS-2557", "Developing Component-based Applicatons", 5, new DateTime(2003, 8, 18)); } return course; } public void SetCourse(CourseInfo course) { thiscourse = course; MessageBoxShow("Course: {0}", courseTitle); } }
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In addition to the stateful class RemotingDemo, another serviced component is shown inListing 5-4 The second serviced component does not keep state When using NET remoting well-known objects, it is important that you do not keep state with the serviced [15] component For well-known objects, you have to use object pooling and just-in-time activation (JITA) If object pooling were not used, new resources on the server would be allocated with every method calland you would have to wait until the garbage collector cleaned up The class StatelessComponent has the attribute [JustInTimeActivation] applied to it so that it can be automatically deactivated by the server after a method call Automatic deactivation is done here with the [AutoComplete] attribute applied to the method GetValue The attribute [ObjectPooling] defines the pool size To return the object to the pool after its use, you also have to override the method CanBePooled to return true This method will just demonstrate that state is indeed not kept, and every time this method is called, 1 will be returned For COM clients, you cannot use the [AutoComplete] attribute without using interfaces, or creating a dual interface with the class The registration utility complains if this is the case, so the attribute [ClassInterface] is applied to the class StatelessComponent
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