Transactional patterns for reliable web services compositions

Reliability is one of the main challenge that encounter Web servicescompositions. Due to the inherent autonomy and heterogeneity of Webservices it is difficult to predict the behavior of the overallcomposite service.Current related technologies are unable to resolve this problemefficiently. These technologies rely on two existing strongapproa-ches: transactional processing and workflow systems. In onehand transactional processing ensures reliability. However, they aretoo rigid to support process based applications like composite Webservices. On the other hand, workflow systems focus mainly oncoordination and organizational aspects and ignore reliabilityissues.In this paper we propose a new solution that combines the businessprocess adequacy of workflow systems and the reliability oftransactional processing. We introduce the concept of transactionalpatterns to ensure reliable composite services. A transactionalpattern can be seen as a convergence concept between workflowpatterns and advanced transactional models. We show how we use it todefine composite services and how we ensure their reliabilityaccording to the designers specific needs.

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