Coordinated forward error recovery for composite Web services

Abstract

This paper proposes a solution based on forward error recovery, oriented towards providing dependability of composite Web services. While exploiting their possible support for fault tolerance (e.g., transactional support at the level of each service), the proposed solution has no impact on the autonomy of the individual Web services, Our solution lies in system structuring in terms of co-operative atomic actions that have a well-defined behaviour, both in the absence and in the presence of service failures. More specifically, we define the notion of Web Service Composition Action (WSCA), based on the Coordinated Atomic Action concept, which allows structuring composite Web services in terms of dependable actions. Fault tolerance can then be obtained as an emergent property of the aggregation of several potentially non-dependable services. We further introduce a framework enabling the development of composite Web services based on WSCAs, consisting of an XML-based language for the specification of WSCAs.

On the Support of Scientific Workflows over Pub/Sub Brokers

“…In this context of Web Services recovery [43], Issarny et al proposed the concept of Web Service Composition Action, which allows multiple choices to be selected based on pre-established specifications. Other works such as [44] define transaction behaviors to compensate for failures based on the workflow skeleton.…”

A Workflow-Based Failure Recovery in Web Services Composition

“…Service Composition in this architecture is a way to obtain more complicated services by combining the functionality of individual services [1,2]. The main problem here is the fault tolerance and recovery of failures while executing a composite service [3,4]. In the situation of using a composite service, different faults may occur that mainly causes a service to fail [5].…”