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When no order is defined, or when the order is defined for some aspects but not for others, AspectJ applies the following rules:
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CHAPTER 3 ASPECTJ
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The subaspects are applied before the inherited aspects. No order is guaranteed for aspects that are not linked by an inheritance relationship. If several advice code blocks apply to the same joinpoint for a given aspect, the following rules apply: After advice code blocks are executed last. Advice code blocks are executed in the order in which they are defined in the aspect. These rules can lead to inconsistencies which are raised by the AspectJ compiler. It is recommended that the aspect order be defined explicitly and as often as possible with the declare precedence keyword combination. When you write an aspect, it is favorable to first write all the before advice code and then the after advice code.
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The Privileged Aspect
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For accessing fields or methods, the same rules apply to aspects as Java classes. For example, aspects cannot read or write a private or protected field. The purpose of this particular rule is to guarantee the integrity of the program and to avoid the accidental and erroneous altering of objects. Nevertheless, some cases require a bypass of this limitation. AspectJ provides for these cases the concept of a privileged aspect: privileged aspect <name> { ... } A privileged aspect can access all the fields and methods defined in a class regardless of their access modifiers. This feature must be used cautiously as it may corrupt the normal behavior of the program.
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Declaring Warnings and Errors
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AspectJ offers a mechanism that raises compile-time warnings or errors whenever a given pointcut expression is matched by a program. In this way, you can be notified if your program defines unwanted code elements. For example, the aspect in Listing 3-15 raises a warning if the Remote interface is implemented in the bank.ejb package. Listing 3-15. Declaring Warnings with an Aspect public aspect Foo { declare warning: execution(* Remote+.*(..)) && within(bank.ejb.*): " Remote may interfere with EJBs in bank.ejb"; } A message can be associated with each raised warning. The declare error keyword combination works similarly.
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CHAPTER 3 ASPECTJ
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By default, AspectJ is a compile-time weaver. Given a set of .java source files and a set of aspects, the ajc command-line tool produces a set of .class files in which the aspects are woven to the classes. Since version 1.2, AspectJ can weave code at load time. The source code of the program is no longer required, and AspectJ can weave any class that can be obtained with the class-loading mechanism of the Java language.
New Features in AspectJ 5
During the writing of this book, AspectJ 1.2.1, which was released on November 5, 2004, was the latest stable version of AspectJ. However, a newer version, numbered 1.5.0 and officially called AspectJ 5, is under preparation. The first major developments of AspectJ 1.5.0M1 were made available to the developing community in December 2004. The main purpose of this evolution was to incorporate the changes brought to the Java language by Java 5. The features described in the remainder of this section can be found in the developer release of AspectJ 1.5.0, which is available at the time of the writing of this book. By the time AspectJ 5 is final, these features may have slightly changed according to user s feedback, design choices, or error corrections. Most of the changes brought by AspectJ 5 deal with annotations (also known as metadata). First, an aspect can deal with an annotated Java program. The annotations defined for classes or methods can be taken into account when defining a pointcut. Also, annotations can be introduced into a Java program. Second, annotations have an impact on the syntax of the AspectJ language itself. Instead of using dedicated keywords such as aspect and pointcut, you can write annotated Java classes that will be understood by the AspectJ weaver as aspects. These two categories of features are presented in the remainder of this section.
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