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There are three types of remote objects. Which one you select depends on the needs of your particular application, including where you want the activation control to be based. There are two server-activated objects available: single call and singleton. Serveractivated objects manage the lifetime of the remote object on the server, whereas cli ent-activated objects manage the object lifetime on the client. The three types of objects available are as follows:

10

These objects involve a single call in which state is not main tained between method calls, which is useful in situations where the objects need to be load balanced. Basically, only one request is handled at a time and when the object is no longer needed, it is immediately discarded.

// Execute the command and send the results to the caller. SqlContext.Pipe.ExecuteAndSend(cmd); } } } }

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These objects are used to service multiple clients and they do maintain state between method calls. This type of remote object can have a per formance advantage when the cost of creating new objects all the time is higher than the cost of maintaining state. These objects only activate when requested by a client. The client receives a dedicated object even though the target object resides on the server. The objects are then managed through a lease-based lifetime man ager that is used to make sure the objects expire and do not hold up resources unnecessarily.

The hosting application is responsible for registering the remote object with the remoting framework, which then listens for remote client requests. It is also respon sible for registering a channel, which is used to handle communication with your remote object. There are four options available to you for hosting the remote object,

Set the StartPage property to establish which document page is displayed when the document preview appears. Set additional properties. Add custom methods and events to a PrintPreviewControl.

Note the following points in this example:

4

and each one has advantages and disadvantages. The four available methods are as follows:

The connection string context connection=true tells the SqlConnection object to connect to the SQL Server instance within which you are already executing. Note that you are still in the same session as you were in outside the CLR code. This means that you are not blocked by any locks that are held by the session that executed this CLR code. The additional namespaces used are the following:

Lessons in this chapter:

These simple applications are used to accept input and dis play output on a command line. Console applications are very useful when a com plex user interface is not needed and you need to learn how to use a new language or technology. For this reason, console applications can be handy when first learn ing remoting, so the sample server application created in Lab 1 in this chapter is hosted in a console application. One disadvantage of console applications is that they need to be started manually; because remoting only works if the hosting application is active, this restriction can limit the use of your remote objects.

The System.Data.SqlClient namespace contains the SqlConnection and SqlCommand classes used in the example. These classes are used to connect to SQL Server and execute the query. Note that these classes are the same ones that you use when connecting from an application. The System.Data.SqlTypes namespace contains the SqlInt32 type used in the example. This type mimics the behavior of an INTEGER in SQL Server. You can use the Value property of the SqlInt32 type to retrieve a CLR integer. The Microsoft.SqlServer.Server namespace contains the SqlContext and SqlPipe classes (needed for the SqlContext.Pipe call) used in the example. These classes are specific to the SQLCLR implementation and are used to communicate to the SQL Server session within which you are executing.

Your Remoting Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

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