Get Coordination Models and Languages: 6th International PDF

By Gérard Boudol (auth.), Rocco De Nicola, Gian-Luigi Ferrari, Greg Meredith (eds.)

ISBN-10: 354021044X

ISBN-13: 9783540210443

ISBN-10: 3540246347

ISBN-13: 9783540246343

This ebook constitutes the refereed continuing of the sixth overseas convention on Coordination versions and Languages, COORDINATION 2004, held in Pisa, Italy in February 2004.

The 20 revised complete papers provided including the abstracts of three invited talks have been conscientiously reviewed and chosen from seventy two submissions. one of the subject matters addressed are context-aware coordination, the Linda coordination version, part variation, aspect-oriented programming, coordination middleware, peer-to-peer structures, coordination languages, community coordination, common sense established coordination, agent coordination, in addition to a number of coordination tools.

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The actual instance of the printing agent is instantiated from a class dynamically generated by applying such mixin to a local superclass that provides the method print_doc acting as a wrapper for the printer driver. , any mixin that is a subtype of the one used for describing the printing agent. Thus any client wishing to print on this site can send a mixin that is subtyping compliant with the one expected. In particular such a mixin can implement finer printing formatting capabilities. Listing 1, where rec is the X-KLAIM keyword for defining a process, presents a possible implementation of the printing client node (on the left) and of the printer server node (on the right).

They can be passed as parameters in methods, but the matching among formal and actual parameters is by syntactic equality on types and not by subtyping), but in a distributed mobile setting the burden seems well-compensated by the added flexibility in communications. Finally, the semantics for the distributed part is based on structural congruence and reduction relations. Reduction represents individual computation steps, and is defined in terms of structural congruence. The structural congruence allows the rearrangement of the syntactic structure of a term so that reduction rules may be applied.

The underlying substitution operation requires specific methods renaming, in order to avoid name collision problems that arise when classes and mixins are used as first-class data in a mobile code setting where matching relies on subtyping. These new metatheoretical results about the precise concept of substitution to be used extend and improve the results presented for MOMI in [8]. Summarizing, O’KLAIM aims at two complementary goals. Firstly, subtyping on classes and mixins (as designed for MOMI) is successfully experimented as a tractable mechanism to coordinate mobile code exchange within a process calculus with a more sophisticated communication mechanism.

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Coordination Models and Languages: 6th International Conference, COORDINATION 2004 Pisa Italy, February 24-27, 2004 Proceedings by Gérard Boudol (auth.), Rocco De Nicola, Gian-Luigi Ferrari, Greg Meredith (eds.)

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