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...languages, we emphasize the need for higher-level module concepts on top of them. For illustrating the problems, we use as an example the implementation of the observer pattern in AspectJ proposed in =-=[7]-=- by Hannemann and Kiczales , as shown in Fig. 1 and Fig. 2, whereby Fig. 1 shows a reusable implementation of the observer protocol in AspectJ, while Fig. 2 binds it to particular classes. The basic i...

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..., AspectJ’s mechanism for specifying effects on the inheritance structure of a base application (the declare parents construct) ought to be mentioned. Following the coding pattern for AspectJ used in =-=[8]-=- to define a reusable publish-subscriber protocol, one might be able to define a reusable pricing implementation in an abstract aspect. The latter could then be bound to a concrete base modular struct...

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...s AspectJ-like pointcuts and advice. In the following discussion, we assume that the reader is familiar with the crosscutting mechanisms in AspectJ [26] and the advantages of observing with pointcuts =-=[20, 27]-=-. In our example, the binding in List. 10 uses pointcuts to observe relevant changes. Pointcuts departmChildrenChange and companyChildrenChange observe DepartmentNode, respectively CompanyNode childre...

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...m communication protocols and additional request processesing routes but also the corresponding programming model in the service description language. Studies on AOP implementation of design patterns =-=[18]-=- show that certain concerns are better addressed by conventional techniques than by AOP, and vice versa. It is then crucial to avoid ambiguity of the semantics of aspects as much as possible in order ...

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...pplications. Although the paper showed only one example,we believe the notion of dataflow would be useful in many situations. Our plan is to apply the pointcut to many programs,such as design patterns=-=[8]-=- and the other kinds of security problems. The design space of the dflow pointcut is large enough for further study. Especially,to find a right balance between the declarativness of the pointcut and t...

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...the human analyzer with the code being explored, than for the previous two categories. However, many of these patterns are well-known and have a clear defined structure, which eases their recognition =-=[5]-=-. Table 1 details the types of crosscutting concerns that were identified and the seeds that led to their identification. For more details we refer to [7]. 4.2. The identifier analysis experiment Appl...

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...ervation that roles can describe crosscutting behavior [35, 43, 53, 54, 79] and that CCCs that have been modularized conceptually by roles are amenable to modular implementation using an AOP language =-=[38]-=-. In our approach, a CCC refactoring consists of a description of the roles within a CCC and refactoring instructions in terms of these (abstract) roles. To invoke the refactoring, a developer maps th...