Reusable Specification ofNon-functional Properties

in DSLsFrancisco Durán, Steffen Zschaler, and Javier Troya

28 September, 2012

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Context

• Model-driven Engineering (MDE)– Domain-Specific Languages defined through

• Metamodels (abstract syntax)• Graphics (concrete syntax)

• Language Semantics– Models are token models– Semantics is given through rewriting

• Specified using in-place model transformations

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Example: A Production Line

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Non-functional Properties

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Analysis Opportunities

DSL modelsDefined by the user+

BehavioralModel

Structural Model

Ecore (MOF)

Rewriting LogicSemantic DomainTransparent to the user

Semantic MappingsTransparent to the user

(Real-Time) MaudeSimulation, reachability analysis, model checking

José E. Rivera, Francisco Durán and Antonio Vallecillo: On the Behavioral Semantics of Real-Time Domain Specific Visual Languages. In Rewriting Logic and Its Applications, LNCS 6381, pp. 174–190

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•Observer values after simulation give predictions,• (Probabilistic) Model checking can be used to

verify satisfaction of NFPs

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A Different Example

Problem: Complete redefinition of response time.

Better:Extract definition of response time into a separate DSL and weave it in.

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Modularised Response Time Observer

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MMResponseTime Server, Queue, Request

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Weaving Languages

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Weaving Languages

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Weaving Languages (2)

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Weaving Languages (2)

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Sanity Conditions

• Need to ensure that adding observers does not change behavioursTransformation step possible for model expressed in DSL

Step still possible in the same model expressed in DSL + Observers (possibly including appropriate observer objects)

• For any legal model and transformation sequence

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DSLMMDSL MDSL

M

This condition can only be checked once the merge has been performed.

We provide conditions to be checked of the observer model and the binding that imply the condition below.

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Conclusions

• We show composition of language semantics– For DSLs based on in-place transformation– For conservative extensions

• Two checkable conditions to verify consistency of such extensions– One can be checked of observer language independent of

composition

• Currently working to weaken some of the assumptions made on base language and binding, etc.

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QUESTIONS?

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