Memorial University DAI: Ad-hoc recovery in workflow systems

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Title	Ad-hoc recovery in workflow systems - formal model and a prototype system
Author	Xing, Xuemin, 1972-
Description	Thesis (M.Sc.), Memorial University of Newfoundland, 2000. Computer Science
Date	1999.
Pagination	x, 98 leaves : ill.
Subject	Workflow--Management; Management information systems; Transaction systems (Computer systems); Production management--Data processing;
Degree	M.Sc.
Degree Grantor	Memorial University of Newfoundland. Dept. of Computer Science
Discipline	Computer Science
Language	Eng
Notes	Bibliography: leaves [93]-98.
Abstract	A 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.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier	a1477474
Rights	The 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.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(11.60 MB) -- http://collections.mun.ca/PDFs/theses/Xing_Xuemin.pdf
CONTENTdm file name	21532.cpd