QoS Analysis in Heterogeneous Choreography Interactions

International audienceWith an increasing number of services and devices interacting in a decentralized manner, choreographies are an active area of investigation. The heterogeneous nature of interacting systems leads to choreographies that may not only include conventional services, but also sensor-actuator networks, databases and service feeds. Their middleware behavior within choreographies is captured through abstract interaction paradigms such as client-service, publish-subscribe and tuple space. In this paper, we study these heterogeneous interaction paradigms, connected through an eXtensible Service Bus proposed in the CHOReOS project. As the functioning of such choreographies is dependent on the Quality of Service (QoS) performance of participating entities, an intricate analysis of interaction paradigms and their effect on QoS metrics is needed. We study the composition of QoS metrics in heterogeneous choreographies, and the subsequent tradeoffs. This produces interesting insights such as selection of a particular system and its middleware during design time or end-to-end QoS expectation/guarantees during runtime. Non-parametric hypothesis tests are applied to systems, where QoS dependent services may be replaced at runtime to prevent deterioration in performance

Towards a quality model for choreography

Quality attributes of software products like maintainability and reliability have been widely studied in the Software Engineering literature. Their understanding has proven instrumental for developing best practices and tooling support that ultimately result in higher-quality software. In this paper we investigate external quality attributes (i.e. aspects of quality visible to the end user) of service choreographies. Service choreographies are service compositions that specify completely distributed, message-based interactions among services. Our work is a first step towards the definition of a quality model for service choreographies

Towards a quality model for choreography

Quality attributes of software products like maintainability and reliability have been widely studied in the Software Engineering literature. Their understanding has proven instrumental for developing best practices and tooling support that ultimately result in higher-quality software. In this paper we investigate external quality attributes (i.e. aspects of quality visible to the end user) of service choreographies. Service choreographies are service compositions that specify completely distributed, message-based interactions among services. Our work is a first step towards the definition of a quality model for service choreographies