By S. Mauw, G. J. Veltink
Glossy machine networks now circle the area, however the transmission of knowledge between them will depend on the numerous varied protocols that outline the habit of the sender and receiver. it really is transparent as a result, that the actual description of those protocols is critical if harmonious verbal exchange is to be maintained. during this ebook the authors use the formal specification language PSF to supply an unambiguous description of a number of verbal exchange protocols of various degrees of complexity, starting from the alternating bit protocol to the token ring protocol. rookies, in addition to pros within the box of communique protocols, will reap the benefits of either the equipment of specification defined, and the protocols mentioned during this ebook.
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Additional resources for Algebraic Specification of Communication Protocols
This is particularly so for specifications of large and complex systems. The result of most errors is that the initial algebra of the specification at hand does not comply with the model we have in mind. Tracking down the errors in the specification is facilitated by the use of a tool that generates the initial algebras of the sorts defined in a given specification of data types. This tool only works correctly for a restricted class of specifications, the class of complete term rewriting systems.
The Sender process is a good candidate for parameterization, because in essence it is capable of sending all kinds of objects. Therefore, we can make the data type a parameter of the module. process module begin Sender parameters Sender-Parameter begin sorts DATA end S e n d e r - P a r a m e t e r exports begin atoms i n p u t : DATA o u t p u t : DATA processes Sender end definitions Sender = sum(d i n DATA, input(d) . output(d)) . Sender end Sender In the example above we can see that parameters are introduced in the parameters section.
As we have explained in the previous section, these systems can become quite large, even for specifications of moderate size. Furthermore, the input for fully automated equivalence testers is restricted to the class of specifications that can be represented by a finite transition system. The equivalence tester in the PSF-Toolkit is based on a notion of equality induced by the so-called branching bisimulation semantics. The explanation of the notion of bisimulation is beyond the scope of this book, but there exist numerous articles on this subject in the literature, to which we refer for detailed information.