By Ramnivas Laddad
A software program approach is the conclusion of a collection of issues. one of many significant premises of object-oriented programming is that every crisis will be carried out as a separate module. despite the fact that, there are specific system-wide issues, corresponding to logging, protection, functionality, and so on, that regularly have to be addressed in lots of, if now not all the modules. as a result, the code to address those system-wide matters will be jumbled in with the middle common sense of a major variety of modules, leading to reduce productiveness, negative caliber, and structures which are demanding to adapt. Aspect-oriented programming overcomes those difficulties via modularizing the system-wide issues.
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Extra info for AspectJ in Action: Practical Aspect-Oriented Programming
Weaving Weaving is the process of composing the system from individual core modules by following the weaving rules. In essence, the weaving rules determine the final form of the system. The weaving rules are defined in aspects that are separate entities from the individual core modules. This separation makes it possible to change the woven system simply by providing alternative weaving rules in the aspects. One way to look at the implementation of the weaving specification is to compare it to event-based programming.
All of these problems lead to a search for better approaches to architecture, design, and implementation. Aspect-oriented programming offers one viable solution. In the next section, we introduce you to AOP and give you a little of its history. 5 Introducing AOP AOP builds on top of existing methodologies such as OOP and procedural programming, augmenting them with concepts and constructs in order to modularize crosscutting concerns. With AOP, you implement the core concerns using the chosen base methodology.
Architects can now focus on the current core requirements of the system. New requirements of a crosscutting nature can be handled by creating new aspects. Further, AOP works in harmony with one of the most popular trends of Extreme Programming (XP) by supporting the practice of “You aren’t gonna need it” (YAGNI). This is a result of the observation that implementing a feature just because you may need it in the future often results in wasted effort because you won’t actually need it. Now with AOP, you can practice YAGNI, and if you do need functionality later, you can implement it without system wide modifications.