Remoting in .NET

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Remoting
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Registering a Channel
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As I explained previously, a .NET remoting application can use a TCP channel or an HTTP channel to move data across AppDomains, plus any custom channel you might have defined for your purposes. In general, using the TCP channel is advisable, both because the protocol is more effi cient and because by default the TCP channel uses a binary formatter to encode data. The HTTP channel, on the other hand, is the only available channel when you host your objects in IIS (see the section Hosting Using Internet Information Services, later in this chapter); the HTTP channel uses the SOAP formatter by default, but you can configure it to use the binary formatter to improve performance. Modifying our example to use the HTTP channel instead of the TCP channel is trivial. In the host application, you simply create an HttpChannel object instead of a TcpChannel:
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(In the host application.)
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Dim channel As New HttpChannel(50000)
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ChannelServices.RegisterChannel(channel)
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In the client application, you need to modify only the protocol portion of the URL used to reach the remote object:
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(In the client application.)
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Connect to the remote object (running on local computer in this demo).
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Dim url As String = http://localhost:50000/calculator.rem"
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Dim calc As Calculator = DirectCast(RemotingServices.Connect( _
GetType(Calculator), url), Calculator)
When you pass a port number to the constructor of the TcpChannel or the HttpChan nel, you create a server channel; when you call the constructor without parameters, you are implicitly creating a client channel. Instead of using a generic TcpChannel object, you can be more specific about whether the channel is to be used on the server (host) or the client machine, by instantiating a TcpServerChannel or a TcpClientChan nel object. Likewise, you can use an HttpServerChannel or an HttpClientChannel in lieu of the more generic HttpChannel. Both the TcpServerChannel and the HttpServerChannel classes expose a constructor that allows you to change the default behavior of the channel itself. The first argument you pass to this constructor is an IDictionary object (usually a Hashtable) that contains one or more property/value pairs. At the very minimum, you must specify the port number, and you can optionally define the channel s name (to later retrieve the chan nel with a call to the ChannelServices.GetChannel method) and its priority (high num bers indicate a higher chance of being chosen to connect first; the default is 1). By default, the channel uses the IP address in the publication URL, but you can change this behavior by assigning False to the useIpAddress property, and you can specify the machine name to be used in publication by setting the machineName property equal to the name of the computer used with the channel:
Part VII:
Advanced Topics
An HTTP channel on port 50000 that publishes an URL containing the machine name.
Dim props As New Hashtable
props( port ) = 50000
props( useIpAddress ) = False
props( machineName ) = MyServer"
Dim channel As New HttpServerChannel(props, Nothing)
ChannelServices.RegisterChannel(channel)
The second argument in the constructor specifies the formatter to be used with the channel. By default, the TCP channel uses the binary formatter and the HTTP channel uses the SOAP formatter, but you can change this default behavior. For example, you can have an HTTP channel use a binary formatter for better performance:
(props is defined as in previous example.)
Dim channel As New HttpServerChannel(props, New BinaryServerFormatterSinkProvider)
ChannelServices.RegisterChannel(channel)
(You can also use the SoapServerFormatterSinkProvider to specify a SOAP formatter with a TCP channel, should you need to do so.) If you register a server channel that uses a nondefault formatter, you must also register a client channel of the same type and that uses the same type of formatter. Notice that in this case, the names of the channel class and of the formatter class contain the string client rather than server:
(In the client application.)
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