Istituto di Scienza e Tecnologie dell'Informazione     
De Nicola R., Latella D., Loreti M., Massink M. MarCaSPiS: a Markovian extension of a Calculus for Services. In: Electronic Notes in Theoretical Computer Science, vol. 229 (4) pp. 11 - 26. M. Hennessy, B. Klin (eds.). Elsevier, 2009.
Service Oriented Computing (SOC) is a design paradigm that has evolved from earlier paradigms including object-orientation and component-based software engineering. Important features of services are compositionality, context-independence, encapsulation and re-usability. To support the formal design and analysis of SOC applications recently a number of Service Oriented Calculi have been proposed. Most of them are based on process algebras enriched with primitives specific of service orientation such as operators for manipulating semi-structured data, mechanisms for describing safe client-service interactions, constructors for composing possibly unreliable services and techniques for services query and discovery. In this paper we show a versatile technique for the definition of Structural Operational Semantics of MarCaSPiS, a Markovian extension of one of such calculi, namely the Calculus of Sessions and Pipelines, CaSPiS. The semantics deals in an elegant way with a stochastic version of two-party synchronisation, typical of a service-oriented approach, and with the problem of transition multiplicity while preserving highly desirable mathematical properties such as associativity and commutativity of parallel composition. We also show how the proposed semantics can be naturally used for defining a bisimulation-based behavioural equivalence for MarCaSPiS terms that induces the same equalities as those obtained via Strong Markovian Equivalence.
URL: http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2313109%232009%23997709995%231399078%23FLP%23&_cdi=13109&_pubType=J&_auth=y&_acct=C000061181&_version=1&_urlVersion=0&_userid=3967543&md5=ce63eab4f640e4449ef6218ddddada80
DOI: 10.1016/j.entcs.2009.07.071
Subject Calculi for Service Oriented Computing
Quantitative Analysis of Systems
Stochastic Process Algebras
H.1 Models and Principles
F.4 Mathematical Logic and Formal Languages
68Q10 Modes of computation (nondeterministic, parallel, interactive, probabilistic, etc.)
68Q85 Models and methods for concurrent and distributed computing (process algebras, bisimulation, transition nets, etc.)

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