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Pointcut: A rule for matching the parts of the object model that the functionality will be applied to This is analogous to the rule defining when a database trigger would apply Aspect: A package of functionality providing the cross-cutting requirements A set of triggers for auditing database access would be analogous to an AOP aspect for auditing Advice: The implementation of functionality that will be applied This is analogous to the implementation of a database trigger Note that my analogies with database triggers are not intended to imply that AOP applies only to data access On the contrary, aspects can be applied anywhere in the object model that can be identified with a pointcut AOP can be used to audit application performance as readily as it can be used to audit user access to particular data entities..

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// Properties public LightMaterial LightMaterial { get { return lightMaterial; } set { lightMaterial = value; } } public TextureMaterial DiffuseTexture1 { get { return diffuseTexture1; } set { diffuseTexture1 = value; } } public TextureMaterial DiffuseTexture2 { get { return diffuseTexture2; } set { diffuseTexture2 = value; } } public TextureMaterial DiffuseTexture3 { get { return diffuseTexture3; } set { diffuseTexture3 = value; } } public TextureMaterial DiffuseTexture4 { get { return diffuseTexture4; } set { diffuseTexture4 = value; } } public TextureMaterial AlphaMapTexture { get { return alphaMapTexture; } set { alphaMapTexture = value; } } public TextureMaterial NormalMapTexture { get { return normalMapTexture; } set { normalMapTexture = value; } } public TerrainMaterial() { } }

The transaction management that you looked at in the section Transactions Using Annotations could hardly have been simpler. The addition of this entry, shown in Listing 5-11, in the application context creates all of the appropriate AOP objects and uses the annotations on the relevant classes to manage transactionality.

To configure the terrain effect, inside the Terrain class, you ll create the SetEffectMaterial method. You ll use this method to configure all the effect parameters, through the TerrainEffect helper class, before the terrain rendering. In your scene, you ll manage the cameras and lights using the CameraManager and LightManager classes you created in 10. You can add these classes to the service container of the Game class.

Listing 5-11. The Single-Line Annotation Configuration <tx:annotation-driven transaction-manager="txManager"/>

habit is to make a service out of each main component of your game, such as the camera, light manager, and terrain. This way, during runtime, all components of your game can query the services container for the active camera, the active light manager, and so on. The benefit is that you can do things like suddenly change the active camera from a first-person camera to a third-person camera, without needing to inform the other components in your game. They will simply ask the main Game object for the currently active camera; they don t need to know about any behind-the-scenes changes.

This configuration can be so terse because of the provision in Spring for facilities to allow custom extensions to the configuration schema. The tx: prefix on elements indicates that a body of code registered with the environment using the standard XML namespace extension facilities will be invoked and that the rest of the configuration information required is extracted from annotations at runtime. This book does not attempt to cover the implementation of these namespace extension facilities because most beginner Spring developers will be consumers rather than authors of the extensions and as Listing 5-11 illustrates, they tend to make the configuration so terse as to need no explanation! The namespace extensions can, for the most part, be taken as mere configuration file entries. You should be aware that they are backed by an implementation, but then this is equally true for the conventional configuration elements of the default namespace such as the <bean> element. Next you will look briefly at the relationship between the schema-based (rather than annotation-based) use of the transaction schema extension. You will then look at a simple use of the Spring AOP support to implement a security aspect. Finally, you will see some of Spring s support for other ways of creating and managing aspects.