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Server-activated objects are somewhat comparable to classic stateless Web Services. When a client requests a reference to a SAO, no message will travel to the server. Only when methods are called on this remote reference will the server be notified. Depending on the configuration of its objects, the server then decides whether a new instance will be created or an existing object will be reused. SAOs can be marked as either Singleton or SingleCall. In the first case, one instance serves the requests of all clients in a multithreaded fashion. When using objects in SingleCall mode, as the name implies, a new object will be created for each request and destroyed afterwards.

All the examples in this chapter use a simple tile sheet that you ll find in the images folder in the chapter s source files. As shown in Figure 9-2, it s a 128-by-128 PNG file that contains four tiles: Button Fairy, a monster, a wall tile, and a floor tile.

Now when the response comes back, you ll receive it in the result(event:Object) method. In the IResponderImplClass, you would take event.result and get the response-concatenated string from it. We ve kept this example simple to help you stay focused on understanding the main ideas instead of getting lost in the details.

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Figure 9-2. The tile sheet used in this chapter Take a close look at the fairy and monster tiles. They re smaller than the maximum tile size, but they re not aligned to the top-left corner. Instead, they re centered in the tile, as shown in Figure 9-3. Because of this, we can just blit the tile at full size, and we don t need to worry about centering it in the game engine.

Note As Singleton objects will be accessed by multiple threads at the same time, it s important that you

Summary

Figure 9-3. The game characters are smaller than the maximum tile size and are centered in the tile sheet.

We began our examination of Flex and Java integration with a discussion of loose coupling using HTTP, and finished with a look at different styles of web service based integration. We mentioned that AMFbased integration provides for tighter integration than anything seen so far. Now let s step back a bit and view the Flex and Java integration options by first illustrating it at a very high level and then progressively drilling down to a detailed perspective. Using a 30,000-foot analogy, we can view the integration as pull-only vs. pull-and-push, as summarized in Figure 7-10.

use correct locking and resource sharing patterns to prevent data corruption. For example, if your objects access a database, you should never use a class-level member that holds a SqlConnection object. Instead, you should create and destroy this connection object directly inside the methods.

Figure 7-10. A 30,000-foot view of integration between Flex and Java Drilling down a bit further, and reaching 10,000 feet, the situation seems divided between the ideas and components that facilitate RPCs and those that enable messaging Figure 7-11 shows the 10,000-foot view.

Button Fairy s actual character size is 64 (width) by 53 (height). But the buildMap method blits her to the stage as a full 64-by-64 tile. (The value of MAX_TILE_SIZE is 64. The maze game examples in this chapter use the same tile engine as the previous chapter.) _fairyModel = new TileModel ( MAX_TILE_SIZE, tileSheetColumn, tileSheetRow, mapRow, mapColumn, MAX_TILE_SIZE, MAX_TILE_SIZE ); This gives her a bit of space on the top and bottom. That space is part of the tile. So, even though she looks smaller, Button Fairy is a 64-by-64-pixel tile. That exactly matches the tile sizes of the walls and floors. Can we use this happy coincidence to our advantage

In the following examples, you ll see the differences between these two kinds of services. You ll use the same shared interface, client- and server-side implementation of the service, and only change the object mode on the server. The shared assembly General.dll will contain the interface to a very simple remote object that allows the storage and retrieval of stateful information in the form of an int value, as shown in Listing 3-1. Listing 3-1. The Interface Definition That Will Be Compiled to a DLL using System; namespace General { public interface IMyRemoteObject {

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