Coordinated Atomic Actions and System Fault Tolerance

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5. CA Action Design of Web Applications: Travel AgencyWe use the canonical Travel Agency (TA) case study as a running example todemonstrate our ideas. TA was designed as a pair:• the TA front end - client side (TAFE-CS): web front-end, exception handling,communication• the TA front end - server side (TAFE-SS): access to existing services, tripcomposition, exception handling, component system monitoringLinking Interface (LIF) is a reduction of the component system (WS) specificationthat includes its functional, temporal and dependability descriptions, which arerequired for integration.clientTAFE-CSLIFLIFTravel AgencyTAFE-SSLIFLIFKLMGeoDBHiltonHertzSabena28 February, 2004
5. CA Action Design of Web Applications: StructuringApplication-level software fault tolerance in TA is achieved by structuring TAusing nested CA actions and by employing disciplined exception handlingwithin this framework.Cooperative exception handling at the action level can involve individual WSs,people including the client, TA support, component system support (ifpossible).29 February, 2004
Page 10 and 11: 3. CA ActionsA CA action is a gener
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Page 22 and 23: 4. Integration of Complex Web Appli
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Page 38 and 39: 6. Future Work and ConclusionsFault
Page 40: Thanks to Brian Randell, Avelino Zo

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