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A type-theoretic interpretation of pointcuts and advice

SCIENCE OF COMPUTER programming 2006年第3期63卷 240-266页

作者： Ligatti, Jay Walker, David Zdancewic, Steve Princeton Univ Dept Comp Sci Princeton NJ 08540 USA Univ Penn Dept Comp & Informat Sci Philadelphia PA 19104 USA

This article defines the semantics of MinAML, an idealized aspect-oriented programming language, by giving a type-directed translation from a user-friendly external language to a compact, well-defined core language. We argue that our framework is an effective way to give semantics to aspect-oriented programming languages in general because the translation eliminates shallow syntactic differences between related constructs and permits definition of an elegant and extensible core language. The core language extends the simply-typed lambda calculus with two central new abstractions: explicitly labeled program points and first-class advice. The labels serve both to trigger advice and to mark continuations that the advice may return to. These constructs are defined orthogonally to the other features of the language and we show that our abstractions can be used in both functional and object-oriented contexts. We prove Preservation and Progress lemmas for our core language and show that the translation from MinAML source into core is type-preserving. Together these two results imply that the source language is type safe. We also consider several extensions to our basic framework including a general mechanism for analyzing the current call stack. (c) 2006 Elsevier B.V. All rights reserved.

关键词： aspects aspect-oriented programming languages operational semantics type theory

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Modular Reasoning in aspect-oriented languages from a Substitution Perspective 13

Modular Reasoning in Aspect-Oriented Languages from a Substi...

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13th International Conference on Modularity (Modularity)

作者： Molderez, Tim Janssens, Dirk Univ Antwerp Ansymo Antwerp Syst & Software Modelling B-2020 Antwerp Belgium

ISBN: (纸本)9783662467343;9783662467336

In object-oriented languages, a notion of behavioural subtyping is needed to enable modular reasoning. This is no longer sufficient when such languages are extended with aspects. In general, all aspects need to be inspected in order to understand the behaviour of a single method or proceed call, which complicates reasoning about aspect-oriented programs. In this paper, we present an approach to modular reasoning that consists of two parts. First, the advice substitution principle, based on behavioural subtyping, identifies when it is possible to remain unaware of an advice while preserving modular reasoning. Second, in cases where it is undesired or impossible to be unaware of an advice, a simple specification clause can be used to restore modular reasoning and to become aware of this advice. We show that our approach effectively enables modular reasoning about pre- and postconditions in a minimal aspect-oriented language called ContractAJ. To ensure the approach is used correctly, we also provide a runtime contract enforcement algorithm that is specified in ContractAJ, and implemented in aspectJ.

关键词： aspect-oriented programming languages Modular reasoning Behavioural subtyping Contract enforcement Design by contract

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Modularizing Crosscutting Concerns with Ptolemy 11

Modularizing Crosscutting Concerns with Ptolemy

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10th International Conference on aspect-oriented Software Development (AOSD)

作者： Rajan, Hridesh Leavens, Gary T. Dyer, Robert Bagherzadeh, Mehdi Iowa State Univ Ames IA 50011 USA Univ Cent Florida Orlando FL 32816 USA

ISBN: (纸本)9781450305563

This tutorial will provide an introduction to Ptolemy. Ptolemy is a programming language whose goals are to improve a software engineer's ability to separate conceptual concerns, while preserving encapsulation of object-oriented code and the ability of programmers to modularly reason about their code. In particular, Ptolemy's features are useful towards modularization of cross-cutting concerns. A cross-cutting concern is a requirement whose implementation is spread across and mixed with the code of other requirements. There has been attempts to improve separation of cross-cutting concerns, e.g. by aspect-oriented and implicit-invocation languages, but none give software developers textual separation of concerns and modular reasoning at the same time. Ptolemy has both these properties important for scalable software engineering. Ptolemy's event types provide a well-defined interface between object-oriented code and cross-cutting code. This in turn enables separate type-checking and compilation. Ptolemy also provides a novel and practical specification mechanism that we call translucid contracts. A translucid contracts allows developers to reason about the control effects of the object-oriented code and cross-cutting code modularly. This tutorial will proceed by discussing the goals of the Ptolemy programming language. We will then discuss Ptolemy's programming features and its specification features by way of several hands-on exercises. We will conclude with pointers to ongoing work on design, implementation and verification of Ptolemy programs.

关键词： modular reasoning aspect-oriented programming languages implicit invocation translucid contracts aspect-oriented interfaces Ptolemy

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