Structuring integrated Web applications for fault tolerance

Abstract

This paper shows how modern structuring techniques can be employed in integrating complex web applications such as Travel Agency systems. The main challenges the developers of such systems face are dealing with legacy web services and incorporating means for tolerating errors.Because of the very nature of such systems, exception handling is the main recovery technique to be applied in their development. We employ Coordinated Atomic actions to allow disciplined handling of such abnormal situations by recursively structuring the integrated system and by associating handlers with such actions. We use protective wrappers in such a way that each operation on legacy components is transformed into an atomic action with a well-defined interface. To accommodate a combined use of several ready-made environments (such as communication packages, services and run-time supports), we employ a multilevel exception handling. We believe that these techniques are generally applicable for both: structuring integrated web applications and providing their fault tolerance.

AdaFF: Adaptive Failure-Handling Framework for Composite Web Services

“…Most previous Web service failure-handling mechanisms considered fast restart [18], consistent service re- sults [13], [19], reliable completion when failures unexpectedly happen [14], [17], and coordinated recovery of concurrent errors [12], [20]. However, the previous failurehandling mechanisms have rarely considered the notion of adaptive failure-handling, i.e., the capability to dynamically provide different recovery flow against the same failure in accordance with the requirement of individual users.…”

Frameworks for designing and implementing dependable systems using Coordinated Atomic Actions: A comparative study

“…CAAs provide fault tolerance by means of cooperative exception handling and employ, where necessary, the action level abort as part of the more general exception handling. CAAs have been successfully used in several case studies (Di Marzo Serugendo et al, 1999;Romanovsky et al, 2003;Xu et al, 2002;) that demonstrate high usefulness and general applicability of the approach.…”

“…For example, a new composite type of CAA has been described in Tartanoglu etal. (2004), Di Marzo Serugendo et al (1999, and Romanovsky et al (2003) and the way external objects are dealt with is spread throughout several papers (Tartanoglu et al, 2004;Xu et al, 1995). In this paper, all these features are collected and described.…”

Analysis and framework-based design of a fault-tolerant web information system for m-health

“…More specifically, CAA focus on concurrent software systems consisting of cooperative and competitive components and it provides fault tolerance by means of cooperative exception handling. CAAs have been successfully used in several case studies [4][5][6] that demonstrate high usefulness and a general applicability.…”