Table 1 Aggregate functions for a given quality attribute a and configuration \(\mathbb {C}=\left \langle S,D\right \rangle \)
From: An approach based on feature models and quality criteria for adapting component-based systems
Function | Formulation | Quality Attribute Examples |
|---|---|---|
Addition | \(M_{a}^{+}(\mathbb {C})=\sum _{f\in S}a_{S}(f)+\sum _{f\in D}a_{D}(f)\) | required memory, reconfiguration andresponse time (sequential execution), |
Product | \(M_{a}^{\times }(\mathbb {C})=\prod _{f\in S}a_{S}(f)\times \prod _{f\in D}a_{D}(f)\) | accuracy, availability |
Maximum | \({M_{a}^{M}}(\mathbb {C})=\max (\max _{f\in S}(a_{S}(f)),\max _{f\in D}(a_{D}(f)))\) | reconfiguration and response time (parallelexecution) |
Minimum | \({M_{a}^{m}}(\mathbb {C})=\min (\min _{f\in S}(a_{S}(f)),\min _{f\in D}(a_{D}(f)))\) | security, usability (using a metric scale forqualifier tags) |