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...ge research is in Java. To enable a range of experiments for operating systems written in C, we developed a paper design for AspectC. Conceptually and in syntax, AspectC is a simple subset of AspectJ =-=[8, 10]-=-. As an initial experiment, we used AspectC to modularize the implementation of prefetching within page fault handling in the FreeBSD OS kernel.sOur methodology was to start by refactoring existing co...

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...localization and modularization of crosscutting concerns [12, 30, 13, 4]. Due to their diversity, we will not discuss aspect-oriented approaches as a homogeneous family. We will only consider AspectJ =-=[11]-=-, the most mature approach today, and Caesar [22, 23], a language which combines concepts from both AspectJ and FOAs. The discussion of other aspect-oriented approaches is postponed until we present r...

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... compare COP to cflow-style constructs from aspect-oriented programming. Cflow constructs, as introduced with AspectJ-like languages, match join points within the dynamic extent of another join point =-=[29]-=-. They allow for the expression of control-flow-dependent behavior variations and, in conjunction with if pointcuts, the conditional composition of such behavior variations. In this sense, AOP languag...

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...follow the paper. 2 Pointcuts and Modularity In this section, we identify the limitations of current pointcut languages by means of an example problem. We focus on AspectJ’s pointcut-advice mechanism =-=[21]-=- first; other 1 Source code is available at [2]. pointcut languages will be discussed in the section on related work. We present an object-oriented (OO) and an aspect-oriented (AO) solution to the pro...

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...iented. This paper takes a step in that direction by presenting a framework that can be used to explain how four proposed mechanisms support modular crosscutting: − Pointcuts and advice as in AspectJ =-=[10, 11]-=-. − Traversal specifications as in Demeter[15], DemeterJ[16] and DJ[14, 21]. − Class composition as in Hyper/J[22, 23]. − Open classes as in AspectJ. 1 We capture the core semantics of these mechanism...

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... been impossible. For such architectures, aspect-oriented programming [22] proposes an alternative solution, which is based on code rewriting. In fact, our component architecture can handle some of the scenarios for which AOP has been proposed as the technique of choice. Other examples besides logging are synchronization, security checking, or choice of data representation. More generally, our architecture can handle all before, after, and around advice on method reception pointcut designators. These represent only one instance of the pointcut designators provided by languages such as AspectJ [21]. Therefore, general AOP is clearly more powerful than our scheme. On the other hand, our scheme has the advantage that it is statically typed, and that scope and order of advice can be precisely controlled using the semantics of mixin composition. 5. DISCUSSION We have identified three building blocks for the construction of reusable components: abstract type members, explicit selftypes, and symmetric mixin composition. The three building blocks were formalized in the νObj calculus and were implemented in Scala. Scala is also the language in which all programming examples and case studies of ...