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Figure 7-11. 10,000-foot view of integration between Flex and Java One more level down gets us into the realm of individual components and their roles. Figure 7-12 is a selfexplanatory representation of this, which we ll call the 1,000-foot view. The diagram lists a few data services, namely LCDS, BlazeDS, GraniteDS, OpenAMF, and WebORB. 8 provides more information on these data services. This chapter has shown a fair bit of these perspectives in practice, and the following chapter builds on them. What you learn from these should be applicable to languages beyond Java and in situations more complex than the ones illustrated. Service-Oriented Architecture (SOA) is transforming legacy applications and driving new applications to create a loosely coupled, scalable, server-side infrastructure. Flex-rich interfaces can be integrated with such an SOA infrastructure using the methodologies discussed in this chapter. Finally, if we zoom in to a very close range, like 100 feet, the details of the wiring and the interaction model comes to light. Figure 7-13 shows this level.

You can steer Button Fairy using the arrow keys. If you press the right arrow key, she ll move right until she hits a wall. But if she s already moving right and you press the down key, she won t move down immediately. Instead, she ll move down only when she reaches an intersection. Even if you press the down key five tiles before she reaches that intersection, she won t attempt to move down until she is exactly centered over the intersection. This results in a very accurate movement system that feels precise and solid. Figure 9-4 illustrates Button Fairy s movements. Here s a summary of the logic behind Button Fairy s control system: When the user presses an arrow key, keep that new direction in memory. When Button Fairy reaches an intersection, move her in that new direction. Clever and interesting! But it also implies something a little more complex going on behind the scenes. How can we track the player s direction choices And how do we know when Button Fairy reaches an intersection Let s take a closer look at the mechanics behind this system.

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void SetValue (int newval); int GetValue(); } } The client that is shown in Listing 3-2 provides the means for opening a connection to the server and tries to set and retrieve the instance values of the server-side remote object. You ll have to add a reference to System.Runtime.Remoting.DLL to your Visual Studio .NET project for this example. Listing 3-2. A Simple Client Application using using using using using System; System.Runtime.Remoting; General; System.Runtime.Remoting.Channels.Http; System.Runtime.Remoting.Channels;

Figure 7-13. 100-foot view of integration between Flex and Java In the next chapter, we ll focus down even further and move on to the subject of tighter integration between Flex and Java over AMF-based data services and media servers.

When the buildMap method creates the _fairyModel, it also creates the _UIMazeController and _UIMazeView objects that control it. _fairyModel = new TileModel ( MAX_TILE_SIZE, tileSheetColumn, tileSheetRow,

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namespace Client { class Client { static void Main(string[] args) { HttpChannel channel = new HttpChannel(); ChannelServices.RegisterChannel(channel); IMyRemoteObject obj = (IMyRemoteObject) Activator.GetObject( typeof(IMyRemoteObject), "http://localhost:1234/MyRemoteObject.soap"); Console.WriteLine("Client.Main(): Reference to rem. obj acquired"); int tmp = obj.GetValue(); Console.WriteLine("Client.Main(): Original server side value: {0}",tmp); Console.WriteLine("Client.Main(): Will set value to 42"); obj.SetValue(42); tmp = obj.GetValue(); Console.WriteLine("Client.Main(): New server side value {0}", tmp); Console.ReadLine(); } } } The sample client will read and output the server s original value, change it to 42, and then read and output it again.

mapRow, mapColumn, MAX_TILE_SIZE, MAX_TILE_SIZE ); //Add the UIView and UIController _UIMazeController = new UIMazeController(_fairyModel); _UIMazeView = new UIMazeView (_fairyModel, _UIMazeController, stage); //Disable friction (it's not needed in this example) _fairyModel.friction = 1; //Set the initial direction. "direction" is a //property of the TileModel class _fairyModel.direction = "right"; //Blit the object to the stage drawGameObject(_fairyModel, _foregroundBitmapData); It sets the initial direction to "right". direction is a property of the TileModel class. It s used to set and track the direction of maze game characters. _UIMazeView captures keyboard input and sends it to _UIMazeController for processing. _UIMazeController has a very simple job. It checks the key being pressed and assigns "left", "right", "up", or "down" to the model s direction property. internal function processKeyDown(event:KeyboardEvent):void { if(event.keyCode == Keyboard.LEFT) { _model.direction = "left"; } if(event.keyCode == Keyboard.RIGHT) { _model.direction = "right"; } if(event.keyCode == Keyboard.DOWN) { _model.direction = "down"; } if(event.keyCode == Keyboard.UP) { _model.direction = "up"; } }

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