model driven distribution pattern design for dynamic web service compositions
Web service compositions are often used to realise service-based enterpriseapplications. These enterprise systems are built from many existing discreteapplications, often legacy applications exposed using Web service interfaces.Acceptance of these systems is often constrained by non-functional aspects,such as Quality of Service (QoS). A number of factors affect the QoS of anenterprise system, including availability, scalability and performance. Thereare a number of architectural configurations or distribution patterns, whichexpress how a composed system is to be deployed. These distribution patternshave a direct impact upon the QoS of the composition. However, the amount ofcode required to realise these distribution patterns is considerable. Additionally, there is an increased deployment time associated with setting updifferent distribution patterns. We therefore propose a novel approach whichcombines a Model Driven Architecture using UML 2.0 for modeling andsubsequently generating Web service compositions, with a method for achieving dynamic decentralised interaction amongst services with reduced deployment overheads. These approaches combined provide for the generation of dynamic Web service compositions driven by a distribution pattern model.
distribution patterns web services compositions decentralisation mda