Call-by-contract for service discovery, orchestration and recovery

  • Authors:
  • Massimo Bartoletti;Pierpaolo Degano;Gian Luigi Ferrari;Roberto Zunino

  • Affiliations:
  • Dipartimento di Matematica e Informatica, Università degli Studi di Cagliari, Italy;Dipartimento di Informatica, Università di Pisa, Pisa, Italy;Dipartimento di Informatica, Università di Pisa, Pisa, Italy;Dipartimento di Ingegneria e Scienza dell'Informazione, Università di Trento, Italy

  • Venue:
  • Rigorous software engineering for service-oriented systems
  • Year:
  • 2011

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Abstract

We present a framework for designing and composing services in a "call-by-contract" fashion, i.e. according to their behavior. We discuss how to correctly plan service compositions in some relevant classes of services and behavioral properties. To this aim, we propose both a core functional calculus for services, and a graphical design language. The core calculus features primitives for selecting and invoking services that respect given behavioral requirements, typically safety properties on the service execution history. A type and effect system over-approximates the actual run-time behavior of services. A further static analysis step finds the viable plans that drive the selection of those services matching the behavioral requirements on demand.