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Server-Activated Objects A remote object must be activated, or created and initial ized just as any other object, before a client can call methods on the remote object. Because MBV remote objects are serialized, copied, and deserialized on the client machine, they are treated like a local client object and activated on deserialization. The .NET Framework remoting system supports two methods for activating an MBR remote object: server activation and client activation.

Server-activated objects come in two flavors: Singleton and SingleCall. Singleton serveractivated objects implement the Singleton design pattern. Only a single instance of a Singleton object is instantiated and that single instance services all incoming client calls to methods on that object. The lifetime of an instance of a Singleton object can span multiple calls from a client and, as such, it can maintain state between client calls. In contrast to Singleton objects, a new instance of a SingleCall server-activated object is created for every client method call. Likewise, SingleCall objects do not maintain state between client calls. A client application must register server-activated objects on the client to be able to instantiate the object. Server-activated objects are generally registered programmati cally on a client using the WellKnownClientTypeEntry class. The WellKnownClientTypeEntry class is used identically the same for the HTTP channel and the TCP channel. The IPC channel is only used to access objects on the same machine, hence it is not necessary to use the WellKnownClientTypeEntry class to register a server-acti vated object when using the IPC channel. The following code sample illustrates reg istering a remote object named IPerson using the TCP channel. The IPerson remote object is located at the URL tcp://localhost:9000/Person.rem and is in the namespace MSLearning.8.Standard.Server. After the WellKnownClientTypeEntry class is used to register the remote object with the client remoting system, the RemotingConfiguration class is used to complete the object registration. The RemotingConfiguration class exposes several static methods includ ing the RegisterWellKnownClientType method and the Configure method. The most commonly used of the two methods is the RegisterWellKnownClientType method as shown in the following code example.

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To help you successfully master the exam objectives presented in this chapter, com plete the following tasks.

If necessary, open SSMS and connect to the appropriate instance of SQL Server 2008. In a new query window, type and execute the following SQL statements to create the ScalarUDF assembly in the AdventureWorks database:

'VB Imports Imports Imports Imports Imports Imports System System.Runtime System.Runtime.Remoting System.Runtime.Remoting.Channels System.Runtime.Remoting.Channels.Tcp MSLearning.5.Standard.Interfaces

CREATE ASSEMBLY ScalarUDF FROM 'C:\TK433SQLCLR\ScalarUDF.dll';

Namespace MSLearning.5.Standard.ClientTcp Module TcpModule Sub Main() ' Create an instance of the TCP client channel.

Create an application that allows the user to rearrange the nodes in a TreeView control but gives them the option of placing moved nodes before, after, or as a child of the target node. Extend the solution in the Lesson 2 lab, Create Localized Forms, to include a language that reads right to left. Create a localized version of the form with appropriate strings and the layout reversed. Use MDI technology to create a Web browser that allows the user to open multiple Web pages at one time, organize them, and easily switch between one and another.

Dim channel As TcpClientChannel = New TcpClientChannel()

In the existing query window, type, highlight, and execute the following SQL statements to create the fnDateTimeToString UDF.

ChannelServices.RegisterChannel(channel, False)

The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-526 certification exam content. You can set up the test so that it closely sim ulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.

' Register the remote object. Dim remoteObject As WellKnownClientTypeEntry = _ New WellKnownClientTypeEntry(GetType(IPerson), _ "tcp://localhost:9000/Person.rem") RemotingConfiguration.RegisterWellKnownClientType(remoteObject) ' more code to follow... End Sub End Module End Namespace //C# using using using using using using

CREATE FUNCTION dbo.fnDateTimeToString ( @DateTime DATETIME ,@Format NVARCHAR(50) ) RETURNS NVARCHAR(50) AS EXTERNAL NAME ScalarUDF."TK433.ClrLab.ScalarUdf".DateTimeToString;

System;

System.Runtime;

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