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OK, maybe don t visualize it then! But anyway, this is a very cool OOP technique called composition Composition is also used to feed the view references of the model and controller: _view = new View(_model, _controller); The view can now use the model and controller anywhere in its class If your mind is anything like mine, you might find it difficult to understand how the pieces of this puzzle all fit together, especially if the code is spread across three different classes To help with what is the most crucial stage in the learning curve to understanding the MVC, take a look at Figure 1-9, also known as The Monster Diagram It shows all the classes on one page and how they communicate with each other You can follow the path the communication takes, from 1 to 5, to see how information flows through the system.

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namespace Server { class SomeRemoteObject: MarshalByRefObject { public void DoSomething() { Console.WriteLine("SomeRemoteObject.doSomething() called"); } } class ServerStartup { static void Main(string[] args) { Console.WriteLine ("ServerStartup.Main(): Server started"); HttpChannel chnl = new HttpChannel(1234); ChannelServices.RegisterChannel(chnl); RemotingConfiguration.RegisterWellKnownServiceType( typeof(SomeRemoteObject), "SomeRemoteObject.soap", WellKnownObjectMode.SingleCall); // the server will keep running until keypress. Console.ReadLine(); } } } Generating the SoapSuds Wrapped Proxy To generate a wrapped proxy assembly, use the SoapSuds command line shown in Figure 3-31. The resulting meta.dll should be copied to the client directory, as you will have to reference it when building the client-side application.

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(To save space, I ve omitted the package block, import directives, variable declarations, and a few other small details, but the most important code from each class is shown) The best way to read this diagram is to have the BasicMVCswf file running in front of you Press one of the arrow keys, and then follow the information flow in the diagram See if you can match up in your mind what you see on the stage with what you see in the diagram This diagram is the Rosetta Stone for understanding the MVC Take as much time as you need to with it before continuing with this chapter Really, I m not going anywhere! When you get your Aha! moment, read on!.

On the result handler, you ensure that the event type is equal to the event type you set in the request which means this is the correct event.

The view s constructor accepts two parameters: the model and controller objects: public function View(model:Object, controller:Object):void {. It needs references to them so that it can read data from the model and send the controller requests to process user input The view copies the value of the model parameter into its _model variable, and adds a CHANGE event listener to it _model = model; _modeladdEventListener(EventCHANGE, changeHandler); Now, whenever the model dispatches a CHANGE event, the view s changeHandler will be called This is a key feature of MVC, and one of the things that makes it such a robust system It means that the view will automatically synchronize with the model This takes care of our in-betweensnapshots problem The program doesn t need to monitor or babysit the view, because the view always knows the model s current state and is able to update itself accordingly.

Implementing the Client Assuming you now want to implement the client application, you first have to set a reference to the meta.dll in the project s References dialog box in VS .NET. You can then use the Server namespace and directly instantiate a SomeRemoteObject using the new operator, as shown in Listing 3-23. Listing 3-23. Wrapped Proxies Simplify the Client s Source Code using System; using Server; namespace Client { class Client { static void Main(string[] args) { Console.WriteLine("Client.Main(): creating rem. reference"); SomeRemoteObject obj = new SomeRemoteObject(); Console.WriteLine("Client.Main(): calling DoSomething()"); obj.DoSomething(); Console.WriteLine("Client.Main(): done "); Console.ReadLine(); } } } Even though this code looks intriguingly simple, I recommend against using a wrapped proxy for several reasons: the server s URL is hard coded, and you can only use an HTTP channel and not a TCP channel. When you start this client, it will generate the output shown in Figure 3-32. Check the server s output in Figure 3-33 to see that DoSomething() has really been called on the server-side object.

private function handleAsyncEvnet(event:Event, passThroughData:Object):void { Assert.assertEquals( event.type, "eventType" ); }

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