NDLI: Repairing event race errors by controlling nondeterminism

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Repairing event race errors by controlling nondeterminism

Content Provider	ACM Digital Library
Author	Sridharan, Manu Møller, Anders Sen, Koushik Karim, Rezwana Adamsen, Christoffer Quist Tip, Frank
Abstract	Modern web applications are written in an event-driven style, in which event handlers execute asynchronously in response to user or system events. The nondeterminism arising from this programming style can lead to pernicious errors. Recent work focuses on detecting event races and classifying them as harmful or harmless. However, since modifying the source code to prevent harmful races can be a difficult and error-prone task, it may be preferable to steer away from the bad executions. In this paper, we present a technique for automated repair of event race errors in JavaScript web applications. Our approach relies on an event controller that restricts event handler scheduling in the browser according to a specified repair policy, by intercepting and carefully postponing or discarding selected events. We have implemented the technique in a tool called EventRaceCommander, which relies entirely on source code instrumentation, and evaluated it by repairing more than 100 event race errors that occur in the web applications from the largest 20 of the Fortune 500 companies. Our results show that application-independent repair policies usually suffice to repair event race errors without excessive negative impact on performance or user experience, though application-specific repair policies that target specific event races are sometimes desirable.
Starting Page	289
Ending Page	299
Page Count	11
File Format	PDF
ISBN	9781538638682
ISSN	15581225
DOI	10.1109/ICSE.2017.34
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2017-05-20
Access Restriction	Subscribed
Subject Keyword	Automated repair Javascript Event-driven programming
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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