The declarative nature of implicit layer activation

Ramson, Stefan; Lincke, Jens; Hirschfeld, Robert

doi:10.1145/3117802.3117804

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…An activation mechanism establishes how and when a layer must be activated. In the body of literature on COP, we can find different kinds of mechanisms to activate layers: Imperative [16,20] are which activate layers with the execution of a statement like with, implicit [7,22,25,32,47,49] activate a layer when a developerdefined conditional is satisfied, event-based [6,23] are which use the matching of events and a conditional to activate layers, and combinations of them [4,24]. Using the smartphone application example, Figure 3 illustrates the three mechanisms to activate the landscape layer when the rotation angle of the smartphone exceeds a threshold.…”

Section: Activation Mechanismsmentioning

confidence: 99%

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Interfaces for Modular Reasoning in Context-Oriented Programming

Leger

Masuhara

Figueroa

2020

Proceedings of the 12th ACM International Workshop on Context-Oriented Programming and Advanced Modularity

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Different activation mechanisms for Context-Oriented Programming (COP) like implicit activations have been proposed, increasing COP opportunities to be applied in real scenarios. However, activation mechanisms and base code definitions are insufficiently decoupled, as conditionals to activate layers require base code variable references. This hinders reuse, evolution, and modular reasoning of COP and base code, and therefore, uses of COP in real scenarios. This paper proposes interfaces, which are shared abstractions to communicate activation mechanisms and base code in a decoupled manner. Using these interfaces, an object can exhibit its internal state and behaviors, and conditionals use them to (de)activate layers. As layers are planned to be (re)used in different applications, developers can use interfaces to overcome the incompatibility between values exposed by a particular base code and values required by a layer. In addition, as a layer is a plain object, it can use an interface to exhibit the conditional evaluation of its activation to other layers to resolve conflicts among activations of layers. We apply this proposal to implicit activations in which evaluations of conditionals implicitly (de)activate layers. Finally, we illustrate the benefits of this proposal through RI-JS, a practical JavaScript library that currently supports interfaces, reactive activations (implementation variant for implicit activations), global and dynamic deployment, enter and exit transition processes, and partial methods.

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Section: Activation Mechanismsmentioning

confidence: 99%

“…When a context is identified, its associated layer is activated. In COP, we can find different activation mechanisms which can be imperative [16,20], event-based [23], or implicit [22,25,32,47,49]. The last two mechanisms allow developers to declare with a conditional when a layer must be activated.…”

Section: Introductionmentioning

confidence: 99%

Interfaces for Modular Reasoning in Context-Oriented Programming

Leger

Masuhara

Figueroa

2020

Proceedings of the 12th ACM International Workshop on Context-Oriented Programming and Advanced Modularity

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“…A layer composition is the combination of layers activated using various activation means, such as global activation [2], dynamic extent [8], or implicit layer activation [14,18]. While most activation means depend on the global context of the program, dynamic extent considers only the local stack as context information.…”

Section: Making Dynamic Extent Aware Of Asynchronous Operationsmentioning

confidence: 99%

“…The IndexedDB12 wrapper Dexie13 includes a zonelike utility called Dexie.Promise14 . Dexie allows developers to describe database transactions as a series of asynchronous tasks.…”

mentioning

confidence: 99%

Zone-based Layer Activation

Ramson

Lincke

Watanabe

et al. 2020

Proceedings of the 12th ACM International Workshop on Context-Oriented Programming and Advanced Modularity

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Scoping behavior adaptations using dynamic extent is a crucial part of Context-oriented Programming (). In a synchronous execution model, dynamic extent ensures the activation of a layer for the entire duration of a block. An asynchronous execution model, however, breaks the intended semantics of dynamic extent. For example, using the await keyword postpones the execution of the block and returns to its caller. Thus, dynamic extent deactivates the behavior adaptation. Consequently, when resuming the postponed execution the layer is no longer active. In this paper, we propose a variant of dynamic extent that activates a layer for a block and all its logically-connected asynchronous operations. We show how zones can be used to track the asynchronous dynamic extent of a block. Further, we provide an implementation of our approach as an extension to ContextJS in JavaScript. CCS CONCEPTS • Software and its engineering → Object oriented languages; Control structures; Coroutines.

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