Exception handling in CSCW applications in pervasive computing environments
Advanced Topics in Exception Handling Techniques
Requirements-Driven modeling of the web service execution and adaptation lifecycle
ICDCIT'06 Proceedings of the Third international conference on Distributed Computing and Internet Technology
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Exceptions are deviations from the normal executionof the program.They occur frequently in programs.Inmodern programming languages exceptions are separatedfrom the normal execution using try-catch blocks andwhenever an exception is raised then the catch blockseither recover from the exception in some way, or logthe exception and abort.A workflow can be characterizedas a long-running process.Exceptions occur in workflowsbut it is more expensive to abort the workflow asmuch work may be lost.Many proposals for describingworkflows have been made.Some address exception handling,but few of these cleanly separate the description ofthe normal workflow from exceptions, and non presentclear implementation details.Our approach to modelingand handling exceptions relies on continuations, listenersas exception handlers, and on policies, or strategies,for continuation.This model leads to a very flexible designbehind the implementation in this paper.Our workhas been validated in a small prototype written in Java,though our approach and design are independent of theprogramming language.