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Another issue with the code in Listing 13-1 is the intertwining of domain logic and the cross-cutting concern in each method. Mixing these together makes code harder to read and maintain. It would be easier if the code within the SubtractTwoNumbers and AddTwoNumbers methods simply contained the necessary domain logic and nothing else. Aspect-oriented programming attempts to address cross-cutting concerns and eliminate the problems of repetition and intermixing.

Note Aspect-oriented software development differs from aspect-oriented programming. Aspect-oriented software development takes the language concepts that support aspect-oriented programming to the next level by adding an environment and methodology to the development process. While the Policy Injection Application Block contains many of the concepts of aspect-oriented programming, it is not a true aspectoriented software development framework.

CHAPTER 8 JOHNNXT IS ALIVE!

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Once you ve placed all of your Items on your Form, you ll need to set an ItemCommandListener on any Item that has a Command of type Command.ITEM associated with it or an ItemStateListener on the whole Form if the Form contains Items into which the user can enter data. Item-specific Commands are new to MIDP 2. You add them to Items using the method Item.addCommand(), and they appear when the user selects the corresponding Item. If the Item is naturally something that the user can modify (such as a TextField or a Gauge), it s generally not necessary to add Item-specific Commands to it. Setting an ItemStateListener should be sufficient, as it s notified with a call to itemStateChanged() when the user makes a change. Notice that when you add a Command directly to a Form, it will be mapped to a button or menu, as described in the section Using Buttons and Menus earlier in this chapter. In the example class in Listing 2-2, this is illustrated by the Done Command, which sets the current Displayable to the MazeCanvas (in other words, it exits the size preferences screen and sends the user to the screen with the maze on it). Listing 2-2 shows the code for the maze game s Form subclass called SelectScreen.java. Listing 2-2. SelectScreen.java package net.frog_parrot.maze; import javax.microedition.midlet.*; import javax.microedition.lcdui.*; /** * This is the screen that allows the user to modify the * width of the maze walls. * * @author Carol Hamer */ public class SelectScreen extends Form implements ItemStateListener, CommandListener { //---------------------------------------------------------------// fields /** * The Done button to exit this screen and return to the maze. */ private Command myExitCommand = new Command("Done", Command.EXIT, 1); /** * The gauge that modifies the width of the maze walls. */ private Gauge myWidthGauge;

Weaving is essentially injecting instructions into the application. Another way to put it is that weaving is changing the original intended behavior of the application. In the .NET environment, two approaches can be taken in aspect-oriented programming: Compile-time weaving: Code is injected into the source code of an application to address the cross-cutting concerns. Runtime weaving: Instructions are injected at runtime, typically through the use of a proxy object that the consuming object sees as the original object. This works much the same way as .NET Remoting does. In order to be able to modify the behavior of an application, it is necessary to define what behavior needs to be performed. The definition of behaviors is known as an advice. An advice is an interceptor placed between the caller and the callee that will perform some action when the entry, exit, or exception occurs while processing some code, such as a method. With the behavior defined, we next need to specify where it will be placed. This can be done in a variety of ways, such as reflection or by decorating the target callee with an attribute. When using reflection, there can be multiple variants of defining where to place the behavior; some may include programming tips and the use of an external definition file such as an application configuration file.

CHAPTER 8 JOHNNXT IS ALIVE!

The purpose of the Policy Injection Application Block is to separate the core concerns of an entity, such as domain logic, from the cross-cutting concerns that are required to develop an application. The block does this through the use of handlers that define the specific behaviors

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