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The service is basically that, a service something, perhaps a behavior, that takes place on behalf of another system. Services themselves can be a variety of types and generally fall into either informational or action oriented. Platform and framework vendors have implemented the tools and libraries that can leverage these standardized contracts to provide a more seamless integration experience amongst the service provider and the consumers (sometimes referred to as receivers and senders). This is what WCF provides in its metadata model: the ability to both define and publish as well as consume these standardized schema definitions. It is possible, in WCF, to provide that support both programmatically at runtime and declaratively at design and configuration time. WCF provides the standards and tools support primarily through SvcUtil.exe. This utility is the primary code and metadata interpretation tool. That, in combination with the WCF framework s ability to leverage reflection to interrogate types adorned with the appropriate attributes, makes generating and using the WCF framework less complicated than before. Figure 4-1 illustrates how service metadata is consumed by SvcUtil.exe for proxy generation; additionally, the same metadata is leveraged by the WCF framework for runtime interaction.

Assuming you have configured the Object Browser to show hidden types, you will find that you once again have a number of Class-suffixed and underscore-prefixed interface types, as well as a number of new items we have not yet examined, whose names suggest they may be used to handle COM to .NET event notifications (__CoCar_Event, __CoCar_SinkHelper, and __CoCarBlewUpEventHandler in particular). Recall from earlier in this chapter, I mentioned that when a COM object exposes COM events, the interop assembly will contain additional CIL code that is used by the CLR to map COM events to .NET events (you ll see them in action in just a bit).

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Given that the CLR will automatically create the necessary RCW at runtime, our VB 2005 application can program directly against the CoCar, CarType, Engine, and IDriveInfo types as if they were all implemented using managed code. Here is the complete module, with analysis to follow:

One great new feature of iOS 3.2 is the inclusion of the UIBezierPath class, which gives you the ability to draw paths of arbitrary complexity. Anyone who has used a vectordrawing program such as Adobe Illustrator is probably familiar with the path tool, which lets you define a curve by clicking on points. You define a start and end point for the curve, along with two control points, giving you a smooth curve from one point to the other. The curve you create in this way is actually several B zier paths linked together. However, a B zier path can also define straight lines, rectangles, and basically any other 2D shape you have in mind. Figure 4 1 shows some examples of paths drawn using UIBezierPath.

There have been lots of discussions in SOA communities regarding best practices for either code first or contract first service development. We won t say one is better than the other. However, in a true contract-first paradigm, you ll spend all the up-front time generating the schema (WSDL) in XML that supports your service contract implementation. Frankly, we d rather listen to someone scratch their nails on a blackboard than start with a whole bunch of XML. Although WCF can support a contract- and schema-driven starting point, for the most part you ll spend time adorning your types with attributes in a declarative model and allowing the WCF framework to generate the necessary schema and contract metadata. The WCF programming model of code first and then apply attributes to the interface allows the WCF framework to do all the work of providing a standardized schema to publish to consumers of the service. This model works best in industries or organizations where you re the only provider of the service or where you re just working on internal solutions that require cross-application integration and you have full control over the interfaces.

Imports Vb6ComCarServer Module Program ' Create the COM class using ' early binding. Public WithEvents myCar As New CoCar() Sub Main() Console.WriteLine("***** CoCar Client App *****") ' Call the Create() method. myCar.Create(50, 10, CarType.BMW) ' Set name of driver. Dim itf As IDriverInfo itf = CType(myCar, IDriverInfo) itf.driverName = "Fred" Console.WriteLine("Drive is named: {0}", itf.driverName) ' Print type of car. Console.WriteLine("Your car is a {0}.", myCar.CarMake()) Console.WriteLine() ' Get the Engine and print name of a Cylinders. Dim eng As Engine = myCar.GetEngine() Console.WriteLine("Your Cylinders are named:") Dim names() As String = CType(eng.GetCylinders(), String()) For Each s As String In names Console.WriteLine(s) Next Console.WriteLine() ' Speed up car to trigger event. For i As Integer = 0 To 3 myCar.SpeedUp() Next End Sub Private Sub myCar_BlewUp() Handles myCar.BlewUp Console.WriteLine("***** Ek! Car is doomed...! *****") End Sub End Module

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