On Generating Dependable Decentralised Web Service Business Sessions

Current solutions for generating Web service business processes (e.g. BPEL4WS) are generally based on centralised models, where a business process is driven by a centralised workflow engine, which schedules the work to be done and assigns it to an appropriate executor. Consequently, current solutions suffer from drawbacks (e.g., poor scalability, vulnerability to failures, etc.), caused by inadequate adoption of centralised models. There are some projects aiming to address these drawbacks from a system architectural point of view, and as a result, various decentralised solutions [2, 4] have been proposed. However, generating decentralised Web service business processes is still a new research topic, and a lot of issues are not yet well understood. The focus of this paper is to discuss two fundamental requirements, Web service instance level authentication, and heterogeneity in exception handling, for generating dependable decentralised Web service business process executions (business sessions).