NDLI: Property models: from incidental algorithms to reusable components

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Property models: from incidental algorithms to reusable components

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Property models: from incidental algorithms to reusable components

Content Provider	ACM Digital Library
Author	Smith, Jacob N. Marcus, Mat Parent, Sean Järvi, Jaakko Freeman, John
Abstract	A user interface, such as a dialog, assists a user in synthesising a set of values, typically parameters for a command object. Code for "command parameter synthesis" is usually application-specific and non-reusable, consisting of validation logic in event handlers and code that controls how values of user interface elements change in response to a user's actions, etc. These software artifacts are incidental - they are not explicitly designed and their implementation emerges from a composition of locally defined behaviors. This article presents property models to capture explicitly the algorithms, validation, and interaction rules, arising from command parameter synthesis. A user interface's behavior can be derived from a declarative property model specification, with the assistance of a component akin to a constraint solver. This allows multiple interfaces, both human and programmatic, to reuse a single model along with associated validation logic and widget activation logic. The proposed technology is deployed in large commercial software application suites. Where we have applied property models, we have measured significant reductions in source-code size with equivalent or increased functionality; additional levels of reuse are apparent, both within single applications, and across product lines; and applications are able to provide more uniform access to functionality. There is potential for wide adoption: by our measurements command parameter synthesis comprises roughly one third of the code and notably more of the defects in desktop applications.
Starting Page	89
Ending Page	98
Page Count	10
File Format	PDF
ISBN	9781605582672
DOI	10.1145/1449913.1449927
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2008-10-19
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Component software Constraint systems Software reuse User interfaces Declarative specifications
Content Type	Text
Resource Type	Article

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