vb.net qr code generator INSIDE THE FRAMEWORK in Visual Basic .NET

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CHAPTER 11 INSIDE THE FRAMEWORK
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HttpServerSocketHandler Reception of the serialized message HttpServerTransportSink [IServerChannelSink] SDLChannelSink [IServerChannelSink] Optional preprocessing [IServerChannelSink] Formatter [IServerChannelSink] Optional preprocessing [IServerChannelSink] DispatcherChannelSink [IServerChannelSink] CrossContextChannel [IMessageSink] Optional dynamic sinks [IDynamicMessageSink] ServerContextTerminatorSink [IMessageSink] LeaseSink [IMessageSink] ServerObjectTerminatorSink [IMessageSink] StackbuilderSink [IMessageSink] WSDL requests
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Optional preprocessing of the serialized message Deserialization
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Customizable during channel creation
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Optional preprocessing of the message Dispatching of the message Notification of context sinks Registration via Context.RegisterDynamicProperty() Last "real" sink
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Increasing lifetime during each call Forwarding the call to StackBuilderSink Execution call on destination object
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From the Message's ServerIdentity
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Figure 11-7. Server-side messaging layers One of the main differences between client-side and server-side message processing is that on the server side, each sink s ProcessMessage() method takes a parameter of type ServerChannelSinkStack. Every sink that is participating in a call pushes itself onto this stack before forwarding the call to the next sink in the chain. The reason for this is that the sinks do not know up front if the call will be handled synchronously or asynchronously. Every sink that s been pushed onto the stack will get the chance to handle the asynchronous reply later. You can see the IServerChannelSink interface here:
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CHAPTER 11 INSIDE THE FRAMEWORK
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public interface IServerChannelSink { IServerChannelSink NextChannelSink { get; } ServerProcessing ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, ref IMessage responseMsg, ref ITransportHeaders responseHeaders, ref Stream responseStream); void AsyncProcessResponse(IServerResponseChannelSinkStack sinkStack, object state, IMessage msg, ITransportHeaders headers, Stream stream); Stream GetResponseStream(IServerResponseChannelSinkStack sinkStack, object state, IMessage msg, ITransportHeaders headers); }
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HttpServerChannel and HttpServerTransportSink
When a connection to the server-side channel is opened, an instance of HttpServerSocketHandler is created and supplied with a delegate that points to the HttpServerTransportSink s ServiceRequest() method. This method will be called after the background thread finishes reading the request stream. The HttpServerTransportSink sets up the ServerChannelSinkStack and pushes itself onto this stack before forwarding the call to the next sink. After the chain has finished processing the message (that is, after the method call has been executed), it generates the HTTP response headers. These will be either 200 OK for synchronous calls or 202 Accepted for one-way messages.
SDLChannelSink
The SDLChannelSink is a very special kind of sink that really shows the power of the .NET Remoting framework s extensibility. Contrary to most other sinks, it does not forward any requests to the destination object, but instead generates the WSDL information needed for the creation of proxies. It does this whenever it encounters either of the strings WSDL or SDL at the end of an HTTP GET request. In this case, the WSDL will be generated by calling the ConvertTypesToSchemaToStream() method from System.Runtime.Remoting.MetadataServices. MetaData.
CHAPTER 11 INSIDE THE FRAMEWORK
Note MetaData is the same class SoapSuds uses when generating proxies.
When the HTTP request is of type POST or when it is a GET request that does not end with the string WSDL or SDL , the message will be passed to the next sink.
SoapServerFormatterSink and BinaryServerFormatterSink
The default server-side HTTP channel uses both formatters in a chained fashion. The first formatter that s used is the SoapServerFormatterSink. This sink first checks whether the serialized message contained in the request stream is a SOAP message. If this is the case, it is deserialized, and the resulting IMessage object is passed to the next sink (which is BinaryServerFormatterSink). In this case, the stream (which is needed as an input parameter to the next sink) will be passed as null. If the stream does not contain a SOAP-encoded message, it will be copied to a MemoryStream and passed to the BinaryServerFormatterSink. The binary formatter employs the same logic and passes either the deserialized message (which it might have already gotten from the SOAP formatter, or which it can deserialize on its own) or the stream (if it cannot decode the message) to the next sink. Both BinaryServerFormatterSink and SoapServerFormatterSink only push themselves onto the SinkStack (before calling ProcessMessage() on the subsequent sink) when they can handle the message. If neither BinaryServerFormatterSink nor SoapServerFormatterSink could deserialize the message and the next sink is not another formatter, an exception is thrown.
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