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.NET Remoting Technology Projection
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Client invocation Transparent Proxy message Real Proxy message Sink NextSink NextSink Sink ... Sink Network Interceptor facility NextSink NextSink Sink ... Sink Remote Object invocation Dispatcher message Sink
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To implement INVOCATION INTERCEPTORS, .NET uses a set of sinks. As the above illustration shows, the sinks are organized as a chain in which each sink knows and invokes its successor (NextSink) after it has provided a specific aspect of the functionality required for the message transfer. The entry point into this stack is provided by the transparent proxy, which transforms the invocation into a message. The message object contains information about the target object, the invoked operation, and the parameters. Its interface is defined as follows:
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public interface IMessage { IDictionary Properties{ get; } }
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The message is then forwarded to the real proxy, which forwards the message to the top-most sink in the stack. The message sink chain on the server and the client side are conceptually similar but not identical. Let s look at the client side. There are two very important sinks that play a vital role in the framework:
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The formatter sink serializes the message objects into a format suitable for transfer over the network. The channel sink handles the actual transfer of the serialized message over the network.
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The extensibility of the .NET framework is largely due to the fact that it is possible to register application-specific sinks, and thereby provide invocation interception. There are sinks that have to be configured statically (that is, when a channel is created, using either the API or the XML configuration file) and others, the dynamic sinks, that can be configured into the chain at runtime. The static sinks can be further grouped into two types: Message Sinks intercept the stream when the message object is still in object form and not yet serialized Channel Sinks operate on the already-serialized messages As the two kinds of sinks work with different data (message object vs. serialized data stream), their interfaces are different. The following interface is the one used for those sinks working on the message level (that is, before the message has been marshaled):
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public interface IMessageSink { IMessageSink NextSink{ get; } IMessageCtrl AsyncProcessMessage( IMessage msg, IMessageSink replySink ); IMessage SyncProcessMessage(IMessage msg); }
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The two kinds of sinks are marked optional in the above illustration because you need not necessarily have them in a system: the minimum
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.NET Remoting Technology Projection system configuration consists of a formatter sink, a channel sink, and some additional sinks that are beyond the scope of this book. Sinks can either just inspect messages or modify them. For example, a channel sink can encrypt the message stream. The fragment of code below shows the interface of a dynamic sink:
public interface IDynamicMessageSink { void processMessageStart( IMessage request, bool clientSide, bool isAsync ); void processMessageFinish( IMessage reply, bool clientSide, bool isAsync ); }
The processMessageStart operation is called by the framework when a request message is sent to the server. The message is passed as an argument. processMessageFinish is called for the reply. On the server side, there is also a formatter sink, which deserializes a request and serializes the reply, as well as a channel sink, which handles network communication. For many tasks, the client- and server-side sinks must be compatible, for example using the same formatters on both sides. The same is true for custom sinks. If you plug in an encryption sink on the client, you need a compatible decryption sink on the server. Note that there are also sinks that do not need collaboration from the other side for example a logging sink. It is also worth noting that the .NET framework itself uses sinks extensively. For example, there is an SDLChannelSink that creates WSDL [CCM+01] INTERFACE DESCRIPTIONS for a .NET Remoting interface. Invocation interception using contexts It is possible to associate objects running in the same (or different) application domains with different contexts. A context basically defines the services the runtime should apply to the objects within the context. Developers can associate objects with a context explicitly, making this feature an implementation of CONFIGURATION GROUPS. By associating a remote object with a specific context, you can define how the framework handles the object.
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