Bridging Java And AspectJ [PPPJ08]
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Through AspectJ, aspect-oriented programming (AOP) is becoming of increasing interest and availability to Java programmers as it matures as a methodology for improved software modularity via the separation of cross-cutting concerns. AOP proponents often advocate a development strategy where Java programmers write the main application, ignoring cross-cutting concerns, and then AspectJ programmers, domain experts in their specific concerns, weave in the logic for these more specialized cross-cutting concerns. However, several authors have recently debated the merits of this strategy by empirically showing certain drawbacks. The proposed solutions paint a different development strategy where base code and aspect programmers are aware of each other (to varying degrees) and interactions between cross-cutting concerns are planned for early on. Herein we explore new possibilities in the language design space that open up when the base code is aware of crosscutting aspects. Using our insights from this exploration we concretize these new possibilities by extending AspectJ with concise yet powerful constructs, while maintaining full backwards compatibility. These new constructs allow base code and aspects to cooperate in ways that were previously not possible: arbitrary blocks of code can be advised, advice can be explicitly parameterized, base code can guide aspects in where to apply advice, and aspects can statically enforce new constraints upon the base code that they advise. These new techniques allow aspect modularity and program safety to increase. We illustrate the value of our extensions through an example based on transactions.
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Bridging Java And AspectJ [PPPJ08]
- 1. Bridging Java and AspectJ through Explicit Join Points Kevin Hoffman and Patrick Eugster PPPJ 2007
- 2. AOP
- 3. AOP
- 4. Cross-cutting Concerns (Thanks to AspectJ Dev Tools (AJDT) Visualization Eclipse Perspective)
- 5. Cross-cutting Concerns (Thanks to AspectJ Dev Tools (AJDT) Visualization Eclipse Perspective)
- 6. Aspect-Oriented Programming Make cross-cutting concerns: Separated from the “base code” No coupling between base code / cross-cutting concerns Aim for lexical and semantic separation Modular Domain experts write the “hard stuff” once