vb.net qr code generator Figure 11-4. Browsing to the ObjRef s properties in the Locals window in Visual Basic .NET

Make QR Code in Visual Basic .NET Figure 11-4. Browsing to the ObjRef s properties in the Locals window

Figure 11-4. Browsing to the ObjRef s properties in the Locals window
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You ll find the ObjRef shown in Figure 11-5 at obj1/_TransparentProxy/_rp/_identity/_objRef.
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Figure 11-5. Locating the ObjRef in the Locals window
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Understanding the Role of Messages
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A message is basically just a dictionary object hidden behind the IMessage interface. Even though every message is based on this interface, the .NET Framework defines several special types thereof. You ll come across ConstructionCall and MethodCall messages (plus their respective return messages). The main difference between these message types is a predefinition of several entries in the internal dictionary. While traveling through the chain of sinks, the message passes at least two important points: a formatter and a transport channel. The formatter is a special kind of sink that encodes the internal dictionary into some sort of wire protocol such as SOAP or a binary representation. The transport channel will transfer a serialized message from one process to another. At the destination, the message s dictionary is restored from the wire protocol by a server-side formatter. After this, it passes through several server-side MessageSinks until it reaches the dispatcher. The dispatcher converts the message into a real stack-based method call that will be executed upon the target object. After execution, a return message is generated for most call types (excluding one-way calls) and passed back through the various sinks and channels until it reaches the client-side proxy, where it will be converted to the respective return value or exception.
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There are several kinds of messages, and each of them is represented by a distinct class, depending on what kind of call it stands for. This object implements the IDictionary interface to provide key/value-based access to its properties. A partial definition of MethodCall is shown here: public class System.Runtime.Remoting.Messaging.MethodCall { // only properties are shown public public public public public public public public public public public public } These values can be accessed in two ways. The first is by directly referencing the properties from the message object, as in methodname = msg.MethodName. The second way is to access the properties using the IDictionary interface with one of the predefined keys shown in the table that follows. When doing this, a wrapper object (for example a MCMDictionary for MethodCallMessages) will be generated. This wrapper has a reference to the original message so that it can resolve a call to its dictionary values by providing the data from the underlying Message object s properties. Here you will see the dictionary keys and corresponding properties for a sample method call message: int ArgCount { virtual get; } object[] Args { virtual get; } bool HasVarArgs { virtual get; } int InArgCount { virtual get; } object[] InArgs { virtual get; } LogicalCallContext LogicalCallContext { virtual get; } MethodBase MethodBase { virtual get; } string MethodName { virtual get; } object MethodSignature { virtual get; } IDictionary Properties { virtual get; } string TypeName { virtual get; } string Uri { virtual get; set; }
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Dictionary Key
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__Uri __MethodName __MethodSignature __TypeName __Args __CallContext
Message s Property
Uri MethodName MethodSignature TypeName Args LogicalCallContext
Data Type
String String Object String Object[] Object
Sample Value
/MyRemoteObject.soap setValue null General.BaseRemote Object, General {42} null
The second kind of message, used during the instantiation of CAOs, is the ConstructionCall. This object extends MethodCall and provides the following additional properties:
CHAPTER 11 INSIDE THE FRAMEWORK
public class System.Runtime.Remoting.Messaging.ConstructionCall { // only properties are shown public Type ActivationType { virtual get; } public string ActivationTypeName { virtual get; } public IActivator Activator { virtual get; virtual set; } public object[] CallSiteActivationAttributes { virtual get; } public IList ContextProperties { virtual get; } }
Examining Message Sinks
The transfer of a message from a client application to a server-side object is done by so-called message sinks. A sink will basically receive a message from another object, apply its own processing, and delegate any additional work to the next sink in a chain. There are three basic interfaces for message sinks: IMessageSink, IClientChannelSink, and IServerChannelSink. As you can see in the following interface description, IMessageSink defines two methods for processing a message and a property getter for acquiring the reference for the next sink in the chain: public interface IMessageSink { IMessageSink NextSink { get; } IMessageCtrl AsyncProcessMessage(IMessage msg, IMessageSink replySink); IMessage SyncProcessMessage(IMessage msg); } Whenever an IMessageSink receives a message using either SyncProcessMessage() or AsyncProcessMessage(), it may first check whether it can handle this message. If it s able to do so, it will apply its own processing and afterwards pass the message on to the IMessageSink referenced in its NextSink property. At some point in the chain, the message will reach a formatter (which is also an IMessageSink) that will serialize the message to a defined format and pass it on to a secondary chain of IClientChannelSink objects.
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