By Lionel Seinturier, Renaud Pawlak
Foundations of AOP for J2EE improvement covers a comparatively new programming paradigm: aspect-oriented programming, or AOP. offered are the center techniques of AOP: AspectJ five, JBoss AOP, Spring AOP, and JAC. particular gains of those instruments are in comparison. The publication additionally explores the capability makes use of of AOP in daily programming lifestyles, similar to layout styles implementation, software checking out, and alertness management.In the latter a part of the publication, the authors convey how AOP can ease the duty of J2EE software improvement. (J2EE is understood for being a wealthy and a bit advanced framework.)
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Extra info for Foundations of AOP for J2EE Development
A framework1 is a set of classes that offers a reusable structure for writing applications. Frameworks are used in numerous areas of application development, especially user interfaces. A J2EE application server can be considered a framework that manages the execution of applications based on web or Enterprise JavaBeans (EJB) components. Developing an application with a framework consists of writing code that is handled by the framework. This code is not run directly—instead, the framework invokes it according to the context.
The first had to do with performance. The initial translation from Java to Java was costly. In addition, a syntax analysis of the Java code was needed before the result of the weaving could be generated—and writing a Java syntax analyzer that is fast enough to manage huge amounts of code is a difficult task. Even more, this task is redundant with the one performed when the produced code is compiled. The second disadvantage had to do with the source code needed to perform the weaving. In some cases, the application was commercial or came from a developer who did not release the source code.
The left side of the figure represents an application consisting of three classes. The horizontal lines show the lines of code that correspond to a crosscutting functionality, such as logging. This functionality crosscuts the application because it affects all the classes. The right side of the figure shows the same application using an aspect to manage the logging functionality (the shaded rectangle). The code of this functionality is now entirely contained within the aspect, and the classes are now separate from the code.