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The earlier code implemented an AJAXBook.Car class that had a constructor that received three parameters to initialize the _Make, _Model, and _Year members on the Car object. This code now implements the SUV class. The SUV constructor takes the same parameters as the Car constructor, plus an additional parameter (strDriveType) that specifies the type of 4WD the vehicle will use. The first line of the SUV constructor passes the make, model, and year up to the base class, so they can be initialized in the base class, thereby avoiding the need to duplicate them in the initialization code in the AJAXBook.SUV class. The SUV constructor then implements and initializes the single distinct property of the SUV class: _DriveType. The prototype of the class contains two methods: the first allows you to define the DriveType property, and the second, the Dispose method, just displays an alert that the memory of the class instance is being reclaimed. The last statement in the code shows how to use the registerClass method to register the SUV class in the AJAXBook namespace. The first parameter in the registerClass method, AJAXBook.SUV, specifies the fully qualified name of the new class. The second parameter in the registerClass method, AJAXBook.Car, specifies the base class. In other words, AJAXBook.SUV inherits from AJAXBook.Car. To see the AJAXBook.SUV class in action, return to the web page you created earlier, and change the Button1_onclick script to match the following code:

The WCF service layer also supports a special kind of service called RemoteObjects, which is functionally equivalent to today s NET Remoting enabled solutions in that it allows you to invoke remote distributed objects while preserving object type fidelity during transport RemoteObjects uses RPC-style communications, and like NET Remoting, it can be used for both interprocess communications and Internet communications that operate across different application domains..

We are all familiar with two common messaging modes: Peer-to-Peer (e.g., chat applications) and Request/Response (e.g., Internet browsing). With SOAP messaging, the concept of clients and services does not really apply, because this implies a fixed communication pattern (meaning that the client always initiates the request, and then the service responds). With SOAP messaging, it is more accurate to refer to senders and receivers, which implies roles rather than functions. A given service may function as a message receiver in some cases, and as a message sender in others. The WSE 2.0 messaging framework provides dedicated classes for the sender and receiver roles. The SoapSender class sends a message out to a specified endpoint (URI). The class is straightforward to use, as shown in Listing 9-5.

function Button1_onclick() { var testCar = new AJAXBook.Car('Honda','Pilot','2005'); alert(testCar.get_MakeandModel()); alert(testCar.get_Year()); var testSUV = new AJAXBook.SUV('Honda','Pilot','2005','Active'); alert("SUV Make and Model: " + testSUV.get_MakeandModel()); alert(testSUV.get_Year());

SoapSender soapSender = new SoapSender(toUri); soapSender.Send(message);

Service-oriented applications send and receive messages to SOAP endpoints. In WCF, the Port object defines two things: 1. Service layer information, including the operations that the service supports 2. The supported transport mechanisms and wire formats (e.g., SOAP 1.2 encoding over HTTP) We want to emphasize the tie-in between WCF technology and today s technology. The WCF Port object is equivalent to a WS-Addressing construct called the endpoint reference. In 8 we discuss endpoint references, which are equivalent to the <service> element in the WSDL document and provide both addressing and binding information for a Web service. Listing 9-6 provides an excerpt from the StockTrader WSDL document showing how the <service> and associated <binding> tags work together to document the location of a service, and the operations that it provides.

alert(testSUV.get_DriveType()); return false; }

The SoapReceiver class is abstract and must be implemented in a custom class that is assigned to receive the corresponding response for a message request. In a sense, this custom SOAP receiver class acts like a callback function, in that it is called when a response is ready. But unlike a traditional callback function, the custom SOAP receiver class is decoupled from the request. There are three steps to implementing a custom SOAP receiver class: 1. 2. Create a custom class that implements the SoapReceiver abstract class. Override the Receive method with a custom implementation for processing the incoming response message. Register the custom receiver class so that the messaging framework knows it is the handler for the incoming response message.

CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)

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