By Roberto Bruni (auth.), Marco Bernardo, Luca Padovani, Gianluigi Zavattaro (eds.)
This ebook offers a collection of eight papers accompanying the lectures of prime researchers given on the ninth version of the overseas university on Formal tools for the layout of computing device, communique and software program structures, SFM 2009, held in Bertinoro, Italy, in June 2009.
SFM 2009 used to be dedicated to formal equipment for internet providers and coated a number of features together with coreography, orchestration, description ideas, interplay, synthesis, composition, consultation forms, contracts, verification, safeguard, and performance.
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Extra info for Formal Methods for Web Services: 9th International School on Formal Methods for the Design of Computer, Communication, and Software Systems, SFM 2009, Bertinoro, Italy, June 1-6, 2009, Advanced Lectures
G. to collect the fares oﬀered from diﬀerent providers and compare them to choose the best one. e. r v ↑ P can be read as v | r P, except for the fact that P cannot execute until v has been consumed. Pipelining. CaSPiS exploits a generalised form of Orc sequencing operator, called pipeline and written P > Q, which allows to feed Q with all values produced by P: for each value, a fresh instance of Q will be activated, running in parallel with P > Q. A pipeline can be seen as some sort of redirection for the concretions available in P: instead of being available to the peer of the current session, they are given in input to Q, which is typically guarded by some abstraction prefix.
Two fresh services wh and re are used, respectively, to enclose the evaluation of e1 in a session that can be terminated and to receive the first value provided by e1 and install the manager for variable x with that value. This is exemplified below, where we omit all restriction to improve readability and write P1 and P2 in place of e1 o2c and e2 o2c , respectively. x1 )re. x. x1 )re. x. x1 Note that e2 o2c is executed concurrently, but may rely on value requests to the manager for x. When e1 o2c produces a concretion, it flows through the pipeline and activates the invocation to re.
The resulting service composition GS 2 ⊕ RS 3 clearly has problems. It may be the case that the customer leaves while the food has been or will be delivered. One may wonder which service would be compatible with RS 3 , as it is unclear for the outside whether the food will be delivered or not. We will come back to this question in Sect. 3. Figure 3(b) shows improved versions of the “potentially leaving guest service” and the “drunk cook restaurant service”: GS 3 and RS 4 . In the new service choreography the cook starts singing Irish folk songs when he gets drunk.