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CHAPTER
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Spring AOP 2.0
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elcome to the chapter on the future of Spring AOP. In 3, we described how Spring AOP has been used up to the Spring 1.2.x releases. This chapter covers features added to Spring AOP in the 2.0 release. That s right, new features have been added, so everything you learned about AOP so far is still applicable and available. This really is proof that the Spring 2.0 release remains fully backwardcompatible with Spring 1.2.x. We strongly recommend upgrading your Spring version to the latest 2.0 release. Full backward-compatibility is assured. If you haven t done so already, now is a good time to review the concepts covered in 3, as they continue to be the foundations of Spring AOP. The following are the new features that will be covered in detail in this chapter: The @AspectJ-style of writing aspects with Java 5 annotations, including the supported advice types The AspectJ pointcut language The Spring AOP XML tags to declare aspects in XML for those cases where Java 5 is not available or existing classes must be used as advice The Spring AOP XML advisor tag to combine classic Spring AOP advice classes and the AspectJ pointcut language
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Introducing AspectJ and Aspects
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While classic Spring AOP (covered in 3) works with advice, pointcuts, and advisors, the new Spring AOP works with advice, pointcuts, advisors, and aspects. Not much of a difference you may think, but as you ll find out soon, things have changed significantly. Literally all the new Spring AOP features are built on top of the integration with the AspectJ AOP framework. (The proxy-based interception mechanism remains in place, so the skills you ve gained from the previous chapter will remain useful.) So what is AspectJ The AspectJ FAQ (http://www.eclipse.org/aspectj/doc/released/ faq.html) answers this question as follows: AspectJ is a simple and practical extension to the Java programming language that adds to Java aspect-oriented programming (AOP) capabilities. AOP allows developers to reap the benefits of modularity for concerns that cut across the natural units of modularity. In objectoriented programs like Java, the natural unit of modularity is the class. In AspectJ, aspects modularize concerns that affect more than one class.
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CHAPTER 4 SPRING AOP 2.0
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And what is an aspect That is also answered by the same FAQ as follows: Aspects are how developers encapsulate concerns that cut across classes, the natural unit of modularity in Java. From the previous chapter, you know that cross-cutting concerns are modularized as advice. These are encapsulated by an advisor, which combines one advice and one pointcut. This encapsulation tells at which join points in the software the advice is executed. Aspects and advisors seem to have much in common: they both encapsulate concerns that cut across classes. Advice is executed at join points that are matched by a pointcut; however, a given pointcut may not match any join points in an application. Now let s look at what you can do with an aspect: You can declare pointcuts. You can declare errors and warnings for each join point that is selected by the associated pointcut. You can declare new fields, constructors, and methods in classes. These are called inter-type declarations in AspectJ. You can declare one or more advices, each one executed for all joint points matched by a pointcut. When comparing the two, it quickly becomes clear an aspect is a much more sophisticated construct than an advisor. For now, it s sufficient to understand aspects and advisors both encapsulate cross-cutting concerns yet take a different approach.
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Join Points and Pointcuts in AspectJ
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AspectJ supports many more join point types than Spring AOP, which supports only method executions. The following is a selection of join points supported by AspectJ: Calls to methods and execution of instance and static methods Calls to get and set values on instance fields and static fields Calls to constructors and execution of constructors Classes and packages None of these additional join points are featured in Spring AOP However, it s useful to have an . idea about which join points are supported by AspectJ when discussing pointcuts. To select the rich set of supported join points, AspectJ has its own pointcut language. The following pointcut selects all static and instance methods named relax, regardless of their arguments, return type, or classes: execution(* relax(..)) When you consider all the join point types supported by AspectJ, a proper language is the only flexible way to define pointcuts. Any other means, including XML configuration or an API, would be a nightmare to write, read, and maintain. Spring AOP integrates with this AspectJ pointcut language, which is covered later in this chapter, in the Working with Pointcuts section. For now, all you need to know is that the asterisk (*) matches any method or class name or any argument type, and the double dot (..) matches zero or more arguments.
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