Formal Methods for Open Object-Based Distributed Systems: by Bart Jacobs (auth.), Elie Najm, Uwe Nestmann, Perdita

By Bart Jacobs (auth.), Elie Najm, Uwe Nestmann, Perdita Stevens (eds.)

This quantity comprises the complaints of FMOODS 2003, the sixth IFIP WG 6. 1 overseas convention on Formal equipment for Open Object-Based disbursed platforms. The convention used to be held in Paris, France on November 19–21, 2003. the development was once the 6th assembly of this convention sequence, that's held approximately each year and a part, the sooner occasions having been held in Paris, Canterbury, Florence, Stanford, and Twente. ThegoaloftheFMOODSseriesofconferencesistobringtogetherresearchers whose paintings encompasses 3 very important and similar ?elds: – formal tools; – disbursed structures; – object-based know-how. one of these convergence is consultant of contemporary advances within the ?eld of allotted systems,andprovideslinksbetweenseveralscienti?candtechnologicalcommu- ties, as represented via the meetings FORTE/PSTV, CONCUR, and ECOOP. the target of FMOODS is to supply an built-in discussion board for the p- sentation of analysis within the above-mentioned ?elds, and the alternate of principles and studies within the subject matters fascinated by the formal tools aid for open object-based allotted structures. For the decision for papers, elements of int- est of the thought of structures integrated, yet weren't restricted to: formal types; formal strategies for speci?cation, layout or research; component-based layout; veri?cation, trying out and validation; semantics of programming, coordination, or modeling languages; style structures for programming, coordination or modelling languages; behavioral typing; a number of standpoint modelling and consistency - tween di?erent types; variations of types; integration of caliber of s- vice requisites into formal types; formal types for protection; and appli- tions and event, conscientiously described.

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Additional info for Formal Methods for Open Object-Based Distributed Systems: 6th IFIP WG 6.1 International Conference, FMOODS 2003, Paris, France, November 19.21, 2003. Proceedings

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We associate the probability πr (αr (ρ)) with this transition. We can now see why the Fr cover αr was needed. The nondeterminism associated with the choice of the R/A-match must be removed in order to associate a probability space over the space of computations (which are infinite sequences of canonical one step Rrewrites). The nondeterminism is removed by what is called an adversary of the system, which defines a probability distribution over the set of R/A-matches. In [9] a probability space is associated over the set of computation paths.

N}) mapping each i to {i}. 5 The PMaude Tool We have developed an interpreter called PMaude , which provides a framework for specification and execution of finitary probabilistic rewrite theories. 0 [4, 3] using the Full-Maude library [6]. We describe below how a finitary probabilistic rewrite theory is specified in our implemented framework and discuss some of the implementation details. 2 By the assumption that (Σ, E ∪ A) is confluent, sort-decreasing, and terminating modulo A, and by a metatheorem of Bergstra and Tucker, any condition C of the form ( i ui = vi ∧ j wj : sj ) can be replaced in an appropriate protecting enrichment (Σ, E ∪ A) of (Σ, E ∪ A) by a semantically equivalent Boolean condition C = true.

The class of complete object-oriented graphs is not closed under object-oriented derivation using general object-oriented rules. Proof. (sketch) This theorem can be easily proven by a counterexample, since the deletion of a node causes the deletion on any of its incident arcs. The resulting graph will not be a complete object-oriented graph anymore. Theorem 3 describes a situation known as deletion in unknown contexts. This situation is very common in distributed systems, where the deletion of an object causes a number of dangling pointers to occur in the system as a whole.

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