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Memorial University - Electronic Theses and Dissertations 4
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Document Description
TitleAd-hoc recovery in workflow systems - formal model and a prototype system
AuthorXing, Xuemin, 1972-
DescriptionThesis (M.Sc.), Memorial University of Newfoundland, 2000. Computer Science
Paginationx, 98 leaves : ill.
SubjectWorkflow--Management; Management information systems; Transaction systems (Computer systems); Production management--Data processing;
Degree GrantorMemorial University of Newfoundland. Dept. of Computer Science
DisciplineComputer Science
NotesBibliography: leaves [93]-98.
AbstractA workflow management system (WFMS) facilitates business processing (workflow) across distributed nodes. State-of-the-art WFMSs do not have adequate support for the dynamic changes during the workflow execution. This thesis focuses on one of the dynamic problems, ad-hoc recovery. It is a phenomenon that occurs in workflow applications when an agent needs to alter the control flow prescribed in the original definition. Specifically, we are interested in the backward ad-hoc recoveries, in which the control flow is redirected backward. When this happens, some tasks will be re-executed and consistency problems may arise. In our proposed ad-hoc recovery model, the key components of the ad-hoc recovery are defined and some constraints are given to ensure the correctness of the workflow execution. We also present a WFMS prototype, describing its design strategy and implementation method, as well as a related protocol, as one application of this model. The protocol is exemplified by a hospital workflow. Some performance issues are also discussed.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifiera1477474
RightsThe author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(11.60 MB) --
CONTENTdm file name21532.cpd