Towards a Quality Model for Choreography

Abstract

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.

QoS Composition and Analysis in Reconfigurable Web Services Choreographies

“…This is more complex due to extensive data dependencies and message passing among participants in choreographies. In [10], Mancioppi et al provide a structured overview of the possible metrics to be incorporated. Xiangpeng et al [22] provide a formal analysis of integrating QoS into the language Chor and provide composition techniques for latency and cost.…”

“…For choreographies, in addition to these metrics, the evaluation must also take into account the integrity of messages passed. Unlike data independent orchestrations, where the centralized orchestrator may separate functional and QoS analysis, choreography QoS have to consider [10]:…”

QoS Analysis in Heterogeneous Choreography Interactions

“…In [17], Mancioppi et al provide a structured overview of the possible metrics to be incorporated within choreographies. A generalized stochastic Petri net model is proposed in [8] to compose QoS in choreographies.…”

Detecção de violações de SLA em coreografias de serviços Web

“…Em tempo de execução, cada participante é responsável pela correta execução do seu papel na coreografia, isto é, seu comportamento esperado na troca de mensagens em relação ao comportamento dos outros participantes. Quando os participantes realizam ou executam seus papéis segundo o acordo comum entre eles, isto é chamado de enactment da coreografia [MPRW10], [Bul08].…”

“…Além disso, os serviços devem utilizar um modelo de mensagens para se comunicar, que tipicamente são os modelos síncrono e assíncrono. No caso do modelo assíncrono, é comum utilizar uma fila FIFO 3 no receptor para armazenar por ordem de chegada as mensagens que ainda não foram consumidas [MPRW10]. Dadas estas definições, os modelos de coreografia de serviços têm que lidar com os seguintes problemas [Bul08], [MPRW10]:…”