Download PDF by Ramnivas Laddad: AspectJ in Action: Practical Aspect-Oriented Programming

By Ramnivas Laddad

ISBN-10: 1930110936

ISBN-13: 9781930110939

A software program process is the conclusion of a suite of issues. one of many relevant premises of object-oriented programming is that every drawback can be carried out as a separate module. even though, there are particular system-wide matters, corresponding to logging, defense, functionality, etc, that frequently have to be addressed in lots of, if no longer all the modules. hence, the code to deal with those system-wide issues should be jumbled in with the middle common sense of a major variety of modules, leading to reduce productiveness, terrible caliber, and platforms which are challenging to conform. Aspect-oriented programming overcomes those difficulties by means of modularizing the system-wide issues.

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Additional info for AspectJ in Action: Practical Aspect-Oriented Programming

Example text

While these solutions do modularize certain crosscutting concerns within the specific domain, their usefulness is restricted to that domain. The cost of using these pre-wired solutions is reflected in the time and effort that is required to learn each new technology that, in the end, is useful only within its own limited scope. Aspect-oriented programming will change this by modularizing crosscutting concerns in a generic and methodical fashion. With AOP, crosscutting concerns are modularized by encapsulating them in a new unit called an aspect.

For example, if the implementation of AOP is Java-based, a special class loader could be used to perform the weaving operation. info 26 CHAPTER 1 Introduction to AOP versions of the classes to the underlying virtual machine (VM). Note that you will still need to compile the aspects to create their byte code. However, you no longer have to weave them with the rest of the classes prior to the execution, since the weaving is now performed in just-in-time style. 1. We’ll look at the main business logic unit as well as the implementation of a few crosscutting concerns.

Code scattering Code scattering is caused when a single issue is implemented in multiple modules. Since crosscutting concerns, by definition, are spread over many modules, related implementations are also scattered over all those modules. For example, in a system using a database, performance concerns may affect all the modules accessing the database. We can classify the code scattering into two distinct categories: duplicated code blocks and complementary code blocks. The first kind is characterized by repeated code of a nearly identical nature.

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AspectJ in Action: Practical Aspect-Oriented Programming by Ramnivas Laddad

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