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Component specifications, the architecture, and use case models are input to the QoS analysis workflow. During this workflow, deployers provide models of the resource environment of the architecture, which contain specifications of extra-functional properties (Section 3.4). The domain expert takes the use case models, refines it, and adds QoS-relevant information, thereby creating a PCM usage model (Section 3.5). Finally, the QoS-Analyst a) combines all of the models, b) estimates missing values, c) checks the models validity, d) feeds them into QoS predictions tools, and e) prepares a pre-evaluation of their predictions, which is targeted at supporting the design decisions of the software architect. More detail about the QoS analysis workflow follows in Section 2.1.5. Outputs of the QoS analysis are pre-evaluated results for QoS metrics, which can be used during specification to adjust the architecture, and deployment diagrams that can be used during deployment.
Snowball
2007-03-16