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Title: Tree-Based Concurrency Control in Distributed Groupware
Authors: Ionescu, Mihail
Marsic, Ivan
Keywords: concurrency control;distributed algorithms;groupware
Issue Date: 2003
Publisher: Springer
metadata.dc.relation.ispartof: Computer Supported Cooperative Work (CSCW): Vol. 12, No. 3
metadata.mci.reference.pages: 329-350
Series/Report no.: Computer Supported Cooperative Work (CSCW)
Abstract: We present a novel algorithm, called dARB, forsolving the concurrency control problem indistributed collaborative applications. Themain issue of concurrency control is resolvingthe conflicts resulting from simultaneousactions of multiple users. The algorithmreduces the need for manual conflict resolutionby using a distributed arbitration scheme. Themain advantages of our approach are thesimplicity of use and good responsiveness, asthere are no lock mechanisms. Our algorithmrequires the applications to use a tree as theinternal data structure. This makes itapplication independent and suitable forgeneral collaborative applications. The treerequirement is reasonable since many newapplications use XML (extensible MarkupLanguage) for data representation and exchange,and parsing XML documents results in treestructures. Example applications of thealgorithm, a group text editor and acollaborative 3D virtual environment calledcWorld, are implemented and evaluated in theDISCIPLE collaboration framework. We alsointroduce awareness widgets that users avoidgenerating the conflicting events and help inmanual conflict resolution.
metadata.dc.identifier.doi: 10.1023/A:1025049525187
ISSN: 1573-7551
Appears in Collections:JCSCW Vol. 12 (2003)

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