Coordinated Atomic Actions and System Fault Tolerance

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5. CA Action Design of Web ApplicationsInterfacing subsystems (LIFs) provide a number of functionalities, includingsupport for:• turning a component system into a CA action participant taking part in allaction-specific activities such as cooperative exception handling (includingresolution of concurrent exceptions at the action level), action entry and exitsynchronisation (when necessary), etc.• structuring the whole TA recursively using CA actions with component systemstaking part in these actions• performing systematic and disciplined local error detection and exceptionhandling at the level of component systems and dealing with mismatchesExperience:• structuring integrated WSs using CA actions• systematic dealing with external non-ACID resources (weakening theatomicity).34 February, 2004
5. CA Action Design of Web Applications: New CharacteristicsCA actions allow for disciplined exception handling and system structuring forfault tolerance. New characteristics:• control of the WSs accessed during action execution• cooperation of WSs (normal and abnormal behaviour)• dedicated processes representing participation of the individual WSs in theactions.• flexible participation (using participant forking-joining)• flexible structuring (action nesting and action composition)35 February, 2004
Page 10 and 11: 3. CA ActionsA CA action is a gener
Page 12 and 13: 3. CA Actions: Concurrent Exception
Page 14 and 15: 3. CA Actions: Long-Lived Activitie
Page 16 and 17: 3. CA Actions: A Case Studyenvironm
Page 18 and 19: 3. CA Actions: A Case StudyPre-cond
Page 20 and 21: 3. CA Actions: A Case Study20 Febru
Page 22 and 23: 4. Integration of Complex Web Appli
Page 28 and 29: 5. CA Action Design of Web Applicat
Page 38 and 39: 6. Future Work and ConclusionsFault
Page 40: Thanks to Brian Randell, Avelino Zo

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