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Aspect oriented programming
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Object-oriented programming (OOP) has been presented as a technology that can fundamentally aid software engineering, because the underlying object model provides a better fit with real domain problems. However most software systems consist of several concerns that crosscut multiple modules. Object-oriented techniques for implementing such concerns result in systems that are invasive to implement, tough to understand, and difficult to evolve. This forces the implementation of those design decisions to be scattered throughout the code, resulting in tangled code that is excessively difficult to develop and maintain. The new aspect-oriented programming (AOP) methodology facilitates modularization of crosscutting concerns. Using AOP, you can create implementations that are easier to design, understand, and maintain. Further, AOP promises higher productivity, improved quality, and better ability to implement newer features. AOP helps overcome the aforementioned problems caused by code tangling and code scattering. Here are other specific benefits AOP offers: Modularized implementation of crosscutting concerns: AOP addresses each concern separately with minimal coupling, resulting in modularized implementations even in the presence of crosscutting concerns. Such an implementation produces a system with less duplicated code. Since each concern s implementation is separate, it also helps reduce code clutter. Further, modularized implementation also results in a system that is easier to understand and maintain. Easier-to-evolve systems: Since the aspected modules can be unaware of crosscutting concerns, it s easy to add newer functionality by creating new aspects. Further, when you add new modules to a system, the existing aspects crosscut them, helping create a coherent evolution. Late binding of design decisions: Recall the architect s under/overdesign dilemma. With AOP, an architect can delay making design decisions for future requirements, since she can implement those as separate aspects. More code reuse: Because AOP implements each aspect as a separate module, each individual module is more loosely coupled. For example, you can use a module interacting with a database in a separate logger aspect with a different logging requirement. In general, a loosely coupled implementation represents the key to higher code reuse. AOP enables more loosely coupled implementations than OOP.

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