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Introducing composite layers in eventCJ

IPSJ Online Transactions 2013年第1期6卷 1-8页

作者： Kamina, Tetsuo Aotani, Tomoyuki Masuhara, Hidehiko The University of Tokyo Bunkyo Tokyo 113-0033 Japan Japan Advanced Institute of Science and Technology Nomi Ishikawa 923-1292 Japan

context-oriented programming (COP) languages provide a modularization mechanism called a layer, which modularizes behaviors that are executable under specific contexts, and specify a way to dynamically switch behaviors. However, the correspondence between real-world contexts and units of behavioral variations is not simple. Thus, in existing COP languages, context-related concerns can easily be tangled within a piece of layer activation code. In this paper, we address this problem by introducing a new construct called a composite layer, which declares a proposition in which ground terms are given other layer names (true when active). A composite layer is active only when the proposition is true. We introduce this construct into EventCJ, out COP language, and verify this approach by conducting two case studies involving a context-aware Twitter client and a program editor. The results obtained in our approach show that the layer activation code is simple and free from tangled context-related concerns. We also discuss the efficient implementation of this mechanism in EventCJ. © 2013 Information Processing Society of Japan.

关键词： context-oriented programming atomic layers activation languages

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Reflective Layer Activation in contextL 07

Reflective Layer Activation in ContextL

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22nd ACM Symposium on Applied Computing

作者： Costanza, Pascal Hirschfeld, Robert Vrije Univ Brussel Programming Technol Lab B-1050 Brussels Belgium Univ Potsdam Hasso Plattner Inst D-14482 Potsdam Germany

ISBN: (纸本)9781595934802

Expressing layer dependencies in context-oriented programming is cumbersome because until now no facility has been introduced to control the activation and deactivation of layers. This paper presents a novel reflective interface that provides such control without compromising efficiency. This allows expressing complex application-defined dependencies between layers where the activation or deactivation of a layer requires the activation or deactivation of another one. The activation or deactivation of specific layers can also be prohibited based on application-defined conditions.

关键词： context-oriented programming dynamic layer activation layer combination software composition

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Learning Recovery Strategies for Dynamic Self-healing in Reactive Systems 19

Learning Recovery Strategies for Dynamic Self-healing in Rea...

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IEEE/ACM 19th Symposium on Software Engineering for Adaptive and Self-Managing Systems (SEAMS)

作者： Sanabria, Mateo Dusparic, Ivana Cardozo, Nicolas Univ Andes Bogota Colombia Trin Coll Dublin Dublin Ireland

ISBN: (纸本)9798400705854

Self-healing systems depend on following a set of predefined instructions to recover from a known failure state. Failure states are generally detected based on domain specific specialized metrics. Failure fixes are applied at predefined application hooks that are not sufficiently expressive to manage different failure types. Self-healing is usually applied in the context of distributed systems, where the detection of failures is constrained to communication problems, and resolution strategies often consist of replacing complete components. However, current complex systems may reach failure states at a fine granularity not anticipated by developers (for example, value range changes for data streaming in IoT systems), making them unsuitable for existing self-healing techniques. To counter these problems, in this paper we propose a new self-healing framework that learns recovery strategies for healing fine-grained system behavior at run time. Our proposal targets complex reactive systems, defining monitors as predicates specifying satisfiability conditions of system properties. Such monitors are functionally expressive and can be defined at run time to detect failure states at any execution point. Once failure states are detected, we use a Reinforcement Learning-based technique to learn a recovery strategy based on users' corrective sequences. Finally, to execute the learned strategies, we extract them as context-oriented programming variations that activate dynamically whenever the failure state is detected, overwriting the base system behavior with the recovery strategy for that state. We validate the feasibility and effectiveness of our framework through a prototypical reactive application for tracking mouse movements, and the DeltaIoT exemplar for self-healing systems. Our results demonstrate that with just the definition of monitors, the system is effective in detecting and recovering from failures between 55% - 92% of the cases in the first application, and at pa

关键词： Self-healing systems context-oriented programming Functional-reactive programming RL

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Towards Type-safe and context-based Behavior Adaptation

Towards Type-safe and Context-based Behavior Adaptation

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9th International Conference on Electrical Engineering, Computing Science and Automatic Control

作者： Zhao, Yinliang Zhu, Changpeng Han, Bo Xi An Jiao Tong Univ Xian 710049 Peoples R China

ISBN: (纸本)9781467321686;9781467321709

Object composition is often advocated as a more flexible approach to specialize the behavior of objects dynamically. In this paper, we propose Dynamic Object Evolution Featherweight Java (DOEFJ), an extension of Featherweight Java with object composition and consultation, to support dynamic behavior adjustment of the program. In DOEFJ, instances of layered classes are created at run-time by the runtime system and are specialized in object composition. According to the current execution context, objects can be evolved by object composition to obtain new context-specific methods. A consultant based mechanism ensures that these new methods are correctly executed. With these mechanisms, the DOEFJ program can dynamically adapts its behavior to the current execution context. The sound type system of DOEFJ assures that no "message-not-understood" errors occur at run-time.

关键词： context-oriented programming Object Composition Consultation Type System

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A Library-Based Approach to context-Dependent Computation with Reactive Values 2016

A Library-Based Approach to Context-Dependent Computation wi...

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15th International Conference on Modularity (MODULARITY)

作者： Inoue, Hiroaki Igarashi, Atsushi Kyoto Univ Grad Sch Informat Kyoto 6068501 Japan

ISBN: (纸本)9781450340335

Language constructs for programming context-dependent computation are required in recent software development, where context information influences program behavior, whose description is often scattered around several modules as conditional expressions. The context-oriented programming (COP) community has revealed that context-dependent computations should be modularized into partially defined methods, those partial methods should be adaptable at run-time, and a method dispatching mechanism should take context information into account. Such language constructs enhance modularity of a program. Although contexts are usually reactively changeable, many existing COP approaches do not consider the relation between contexts and reactive information. In this paper, we develop a Scala library for context-dependent computations, based on the idea of contexts as reactive values, which are well studied in the field of Functional Reactive programming. We also show that dynamic binding is useful to control how reactive values influence context dependent functions;it provides context caching to prevent unexpected reactions.

关键词： context-oriented programming Functional reactive programming Dynamic binding Scala

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Toward Fluent Module Interactions 2016

Toward Fluent Module Interactions

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15th International Conference on Modularity (MODULARITY)

作者： Kamina, Tetsuo Aotani, Tomoyuki Masuhara, Hidehiko Ritsumeikan Univ Tokyo Japan Tokyo Inst Technol Tokyo Japan

ISBN: (纸本)9781450340335

Recent progress on sensor technologies poses challenges on software development such as more interaction with physical environment and context-awareness. This trend makes it difficult to decide the boundaries between changing module interactions. In this paper, we propose a concept of fluent module interactions where we characterize the module interactions in three dimensions, i.e., definition, duration, and scope. Module interactions in any of those dimensions can change dynamically. We also propose a possible extension of existing programming language with fluent module interactions based on context-oriented programming (COP). Then, we derive a future research roadmap for realizing fluent module interactions that covers a wide range of research fields including theory, implementation, engineering, and applications.

关键词： context-oriented programming Dynamic adaptation ServalCJ Research roadmap

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Compatibility Layers for Interface Mediation at Run-Time 2016

Compatibility Layers for Interface Mediation at Run-Time

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15th International Conference on Modularity (MODULARITY)

作者： Rein, Patrick Hirschfeld, Robert Lehmann, Stefan Lincke, Jens Univ Potsdam Hasso Plattner Inst Potsdam Germany

ISBN: (纸本)9781450340335

In adaptable systems, one module might require an interface from another module which the second module does not provide. For some cases, the particular provider module and its interface which will be available at run-time can not be anticipated during development time. In such situations with various provider interfaces, current mitigation strategies for interface mismatches struggle as they often rely on advanced knowledge about one particular providing module. Therefore, we propose the concept of compatibility layers which is based on modular interface mappings. These mappings are applied to adapt the provided interface at run-time. Each mapping contains a set of general requirements for the provided interface and a set of derived functions based on the required features. We have implemented the concept of compatibility layers in a Squeak/Smalltalk prototype based on context-oriented programming. Based on this prototype, we discuss the resulting trade-offs and illustrate exemplary interface mismatches in Squeak/Smalltalk which could be mediated by the prototype.

关键词： interfaces modules interface compatibility dynamic adaptation context-oriented programming

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ReactCOP Supporting Layer Parameter Management for Front-End Web Applications 23

ReactCOP Supporting Layer Parameter Management for Front-End...

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7th International Conference on the Art, Science, and Engineering of programming (programming)

作者： Hashimoto, Hiroki Tanigawa, Ikuta Ogura, Nobuhiko Watanabe, Harumi Tokai Univ Informat & Telecommun Engn Tokyo Japan Change Vis Inc Fukui Japan Tokyo City Univ Fac Informat Yokohama Kanagawa Japan

ISBN: (纸本)9798400707551

In modern software, including web applications, context-dependent behavior is one of the most important features. context-oriented programming (COP) is a suitable programming technique for developing such software. However, we often need to work on handling parameter values in layers. This problem which we experience during the development of web application means inconvenience in setting parameters by each layer. We call it "layer parameter problem." Especially front-end web applications use a component-based approach with a DOM tree, making the layer parameter problem more complicated because they cannot handle COPs in class-in-layer and layer-in-class models. We propose ReactCOP, an implementation of an idea that applies COP to React, one of the front-end web application libraries. ReactCOP solves the parameter problem on a layer-in-component model. As the solution to this problem, we present Layer Parameter Management that dynamically switches values in a variable within a layer. In this paper, we propose ReactCOP with Layer Parameter Management. Finally, we investigate our proposed approach through two case studies.

关键词： React context-oriented programming Web Application

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Delegation-based Semantics for Modularizing Crosscutting Concerns 08

Delegation-based Semantics for Modularizing Crosscutting Con...

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23rd Annual ACM Conference on Object-oriented programming, Systems, Languages and Applications

作者： Schippers, Hans Janssens, Dirk Haupt, Michael Hirschfeld, Robert Univ Antwerp Formal Tech Software Engn Antwerp Belgium Univ Potsdam Hasso Plattner Inst Software Architecture Grp Berlin Germany

ISBN: (纸本)9781605582153

We describe semantic mappings of four high-level programming languages to our delegation-based machine model for aspect-oriented programming. One of the languages is a class-based object-oriented one. The other three represent extensions thereof that support various approaches to modularizing crosscutting concerns. We explain informally that an operational semantics expressed in terms of the model's concepts preserves the behavior of a program written in one of the high-level languages. We hence argue our model to be semantically sound in that sense, as well as sufficiently expressive in order to correctly support features such as class-based object-oriented programming, the open-classes and pointcut-and-advice flavors of aspect-oriented programming, and dynamic layers. For the latter, being a core feature of context-oriented programming, we also provide a formal semantics.

关键词： Semantic Mappings Aspect-oriented Semantics context-oriented programming Modularization

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Hierarchical Layer-Based Class Extensions in Squeak/Smalltalk 2016

Hierarchical Layer-Based Class Extensions in Squeak/Smalltal...

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15th International Conference on Modularity (MODULARITY)

作者： Springer, Matthias Masuhara, Hidehiko Hirschfeld, Robert Tokyo Inst Technol Dept Math & Comp Sci Tokyo Japan Univ Potsdam Hasso Plattner Inst Potsdam Germany SAP Labs CDG Palo Alto CA USA Viewpoints Res Inst Glendale CA USA

ISBN: (纸本)9781450340335

Class extensions are frequently used in programming languages such as Ruby and Smalltalk to add or change methods of a class that is defined in the same application or in a different one. They suffer from modularity issues if globally visible: Other applications using the same classes are then affected by the modifications. This paper presents a hierarchical approach for dynamically scoping class extensions in dynamically-typed, class-based programming languages supporting class nesting. Our mechanism allows programmers to define the scope of class extensions and to reuse class extensions in other programs. Class extensions can be scoped according to a nested class hierarchy or based on whether programmers regard a potentially affected class as a black box or not. Class extensions are organized in layers, where multiple layers targeting the same class can be active at the same time.

关键词： Class extension context-oriented programming mixins

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