NDLI: Reactive object queries: consistent views in object-oriented languages

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Reactive object queries: consistent views in object-oriented languages

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Reactive object queries: consistent views in object-oriented languages

Content Provider	ACM Digital Library
Author	Lehmann, Stefan Rein, Patrick Felgentreff, Tim Hirschfeld, Robert Lincke, Jens
Abstract	Maintaining consistency between data throughout a system using scattered, imperative code fragments is challenging. Some mechanisms address this challenge by making data dependencies explicit. Among these mechanisms are reactive collections, which define data dependencies for collections of objects, and object queries, which allow developers to query their program for a subset of objects. However, on their own, both of these mechanisms are limited. Reactive collections require an initial collection to apply reactive operations to and object queries do not update its result as the system changes. Using these two mechanisms in conjunction allows each to mitigate the disadvantage of the other. To do so, object queries need to respond to state changes of the system. In this paper, we propose a combination of both mechanisms, called reactive object queries. Reactive object queries allow the developer to declaratively select all objects in a program that match a particular predicate, creating a view. Additionally, views can be composed of other views using reactive operations. All views are automatically updated when the program state changes. To better integrate with existing imperative systems, we provide fine-grained events signaling view updates. We implemented the proposed concepts in JavaScript. Our initial experience with example applications shows that the combined concept eases the integration of reactive mechanisms with object-oriented environments by avoiding scattered update code. .
Starting Page	23
Ending Page	28
Page Count	6
File Format	PDF
ISBN	9781450340335
DOI	10.1145/2892664.2892665
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-03-14
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Reactive collections Reactive programming Events Object queries Object-oriented programming
Content Type	Text
Resource Type	Article

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