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    Complete Axioms for Stateless Connectors

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    . The conceptual separation between computation and coordination in distributed computing systems motivates the use of peculiar entities commonly called connectors, whose task is managing the interaction among distributed components. Different kinds of connectors exist in the literature, at different levels of abstraction. We focus on a basic algebra of connectors which is expressive enough to model, e.g., all the architectural connectors of CommUnity. We first define the operational, observational and denotational semantics of connectors, then we show that the observational and denotational semantics coincide and finally we give a complete normal-form axiomatization. 1 Introduction The advent of modern communication technologies shifted the focus of computer science researchers from isolated computing systems to distributed communicating systems, in which interaction plays the prominent role. In Milner's words 21, "computing has grown into informatics and Turing's logical computing machines are matched by a logic of interaction". In this perspective, the analysis of global computing systems is facilitated by approaches, techniques and paradigms that exploit a clean conceptual separation between computation and coordination. This is much evident at several levels of abstraction (architecture, software, processes), where issues like reusability, maintenance, heterogeneity call for modular specifications, theories and models. When separating coordination from computation, the notion of a connector emerges in different contexts, with slightly different meaning, expressiveness and functionalities. The common trait is the role of a connector: a component that mediates the interaction of other computational components and connectors. In particular, connectors have been studied within both algebraic and categorical approaches to system modeling.

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    Description

    Title : Complete Axioms for Stateless Connectors
    Author(s) : Bruni Roberto, Ivan Lanese
    Abstract : . The conceptual separation between computation and coordination in distributed computing systems motivates the use of peculiar entities commonly called connectors, whose task is managing the interaction among distributed components. Different kinds of connectors exist in the literature, at different levels of abstraction. We focus on a basic algebra of connectors which is expressive enough to model, e.g., all the architectural connectors of CommUnity. We first define the operational, observational and denotational semantics of connectors, then we show that the observational and denotational semantics coincide and finally we give a complete normal-form axiomatization. 1 Introduction The advent of modern communication technologies shifted the focus of computer science researchers from isolated computing systems to distributed communicating systems, in which interaction plays the prominent role. In Milner's words 21, "computing has grown into informatics and Turing's logical computing machines are matched by a logic of interaction". In this perspective, the analysis of global computing systems is facilitated by approaches, techniques and paradigms that exploit a clean conceptual separation between computation and coordination. This is much evident at several levels of abstraction (architecture, software, processes), where issues like reusability, maintenance, heterogeneity call for modular specifications, theories and models. When separating coordination from computation, the notion of a connector emerges in different contexts, with slightly different meaning, expressiveness and functionalities. The common trait is the role of a connector: a component that mediates the interaction of other computational components and connectors. In particular, connectors have been studied within both algebraic and categorical approaches to system modeling.
    Subject : unspecified
    Area : Other
    Language : English
    Year : 2005

    Affiliations Computer Science Department, University of Bologna, Bologna, Italy
    Conference_title : CALCO
    Publisher : Springer
    Pages : 98-113
    Url : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.114.2313

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