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2016 | OriginalPaper | Buchkapitel

Context-Oriented Software Development with Generalized Layer Activation Mechanism

verfasst von : Tetsuo Kamina, Tomoyuki Aotani, Hidehiko Masuhara, Tetsuo Tamai

Erschienen in: Transactions on Modularity and Composition I

Verlag: Springer International Publishing

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Abstract

Linguistic constructs such as if statements, dynamic dispatches, dynamic deployments, and layers in context-oriented programming (COP) are used to implement context-dependent behavior. Use of such constructs significantly affects the modularity of the obtained implementation. While there are a number of cases where COP improves modularity related to variations of context-dependent behavior and controls of dynamic behavior changes, it is unclear when COP should be used in general.
This paper presents a study of our software development methodology, context-oriented software engineering (COSE), which is a use-case-driven software development methodology that guides us to specification of context-dependent requirements and design. We develop a systematic method to determine an appropriate linguistic mechanism to implement context-dependent behavior and dynamic changes in behavior during modeling and design, leading to the mechanized mapping from requirements and design artifacts formed by COSE to the COP implementation, which is demonstrated in our COP language ServalCJ through three case studies. We then identify the key linguistic constructs that make COSE effective by examining existing COP languages.

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Nächstes Kapitel Developing and Verifying Response Specifications in Hierarchical Event-Based Systems
Fußnoten
1
Some COP languages do not provide a linguistic construct to pack such implementations as a single unit. However, this is not a significant difference. In the remainder of this paper, we refer to a set of functions (methods) annotated with the same “conditions” for dispatch as a layer irrespective of whether they are packed into a single unit.
 
2
This approach is based on Jacobson’s object-oriented software engineering (OOSE) [27]. We refer to our approach as “COSE” to make its connection to OOSE clear.
 
4
Keays also proposed COP [35], where a context is a named identifier (e.g., location) that identifies the type of open terms (holes in the code skeleton) that are filled at runtime with pieces of code corresponding to a specific context value (e.g., location in “Tokyo”). This paper is based on Hirschfeld’s COP [26] where a context is represented as a layer that dynamically takes two states, i.e., active and inactive, and thus can be represented as a Boolean variable.
 
5
By “specialization,” we mean a specialization relationship that appears in class and use case hierarchies, i.e., a specialization consists of more details than its parent.
 
7
For COP languages that do not provide layer activation by conditionals, we must provide a workaround to implement such conditionals.
 
8
Although Table 5 shows that it is preferable to implement these layers in the class-in-layer style, in Fig. 2, they are implemented in the layer-in-class style because ServalCJ currently only supports this style.
 
9
There are also before and around partial methods that execute before the original method and instead of the original method, respectively, when the respective layer is active.
 
10
This simulator is inspired by a real maze-solving robot (Pololu 3pi Robot: http://​www.​pololu.​com/​product/​975) and the behavior of the simulator is modeled by following the sample program provided by the 3pi Robot distribution.
 
11
Only Trémaux’s algorithm can solve the maze with loops.
 
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Metadaten
Titel
Context-Oriented Software Development with Generalized Layer Activation Mechanism
verfasst von
Tetsuo Kamina
Tomoyuki Aotani
Hidehiko Masuhara
Tetsuo Tamai
Copyright-Jahr
2016
Buch
Transactions on Modularity and Composition I

Print ISBN: 978-3-319-46968-3

Electronic ISBN: 978-3-319-46969-0

Copyright-Jahr: 2016

DOI
https://doi.org/10.1007/978-3-319-46969-0_1