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Internals of .NET Remoting
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it is actually a part of the .NET framework. The following illustration shows this:
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Application-Specific interface Remote Object Interface
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Transparent Proxy
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The interesting thing about the transparent proxy is that you never really see its implementation code. There is no explicit code generation step involved here. While in CORBA, for example, you have to manually code-generate the CLIENT PROXY, this is not necessary in .NET. .NET Remoting takes advantage of the features provided by the .NET runtime which transparently generates the proxy on the fly. Let s look at this a little bit more closely. If a client wants to communicate with a remote object, typically it uses the Activator.GetObject operation to obtain a reference. This operation returns a CLIENT PROXY for the requested remote object, optionally contacting the server application to physically create the instance (depending on the activation mode). The client specifies two parameters: the type of the remote object (as an instance of the Type type) as well as a URL that points to the required object. Since the client passes the type object to the operation, this approach requires the remote object type to be available on the client already. There is thus no need to transfer the interface to the client as part of the Activator.GetObject call. The returned transparent proxy implements the interface of the remote object by forwarding each method invocation to the real proxy that is
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.NET Remoting Technology Projection connected to the server. The on-the-fly code generation is made possible by the Reflection.Emit namespace s classes, which can be used to generate MSIL code at runtime, packaging it into an in-memory assembly for direct execution in the running CLR instance. To find out about the interface of the remote object (the interface that must also be used for the generated transparent proxy), the client runtime uses reflection on the type parameter given in the Activator.getObject call. So what exactly is the interface of a remote object .NET does not require developers to define an explicit interface for remote objects. By default, the public methods of the remote object class constitute the interface of the remote object. To allow the client to use reflection to build the transparent proxy, this implies that the implementation of the remote object is actually available to the client. However, it is not good design practice to transfer the implementation class s code to the client merely to invoke remote operation invocations. It is therefore good practice to define an explicit interface for remote objects, as illustrated in the following code fragments.
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namespace PatientManagementShared { public interface IPatientManager { Patient getPatientInfo( String id ); } }
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The remote object hosted by the server then has to implement this interface:
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namespace PatientManagementServer { public class PatientManager : MarshalByRefObject, IPatientManager { public Patient getPatientInfo( String id ) { return new Patient( id ); } } }
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Extensibility of .NET Remoting
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Using this idiom, only the code of the interface IPatientManager needs to be available on the client, the implementation class is used only on the server. Note that the implementation code is not necessary at the client anyway, since the implementation on the client side must only package the invocation and forward it to the real proxy. As a consequence of this process, we can write code that uses only the interface type on the client, as opposed to the remote object implementation class:
IPricingFactory pf = (IPricingFactory)Activator.GetObject( typeof( IPricingFactory ), "tcp://localhost:6642/PricingFactory" );
Extensibility of .NET Remoting
In this section we look at some advanced features of .NET Remoting, which are mostly concerned with extensibility. These include: INVOCATION INTERCEPTORS, which provide hooks into .NET Remoting s message-handling architecture INVOCATION CONTEXTS, which allow additional data to be sent with remote method invocations PROTOCOL PLUG-INS, which allow for adaptation of the communication protocol Custom MARSHALLERS, which allow adaptation of the marshaling format for specific needs Intercepting the invocation stream This section provides some details about how .NET Remoting works internally and how developers can extend its functionality. Note that for reasons of brevity we cannot delve into too much detail here. Please refer to [Ram02] for more information. .NET can use several communication channels for access to remote objects. A channel provides a specific configuration for accessing remote objects. This includes protocols, the endpoint configuration, a message serializer and, as we shall see, INVOCATION INTERCEPTORS, if required. The Remoting framework in .NET is built as a layered system. Let s look at the following illustration first.