By S. Mauw, G. J. Veltink
Sleek desktop networks now circle the realm, however the transmission of knowledge between them will depend on the numerous diverse protocols that outline the habit of the sender and receiver. it truly is transparent consequently, that the exact description of those protocols is necessary if harmonious conversation is to be maintained. during this publication the authors use the formal specification language PSF to supply an unambiguous description of a number of conversation protocols of various degrees of complexity, starting from the alternating bit protocol to the token ring protocol. newcomers, in addition to execs within the box of conversation protocols, will reap the benefits of either the tools of specification defined, and the protocols mentioned during this publication.
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Extra resources for Algebraic Specification of Communication Protocols
However, the second expression offers the possibility of performing a skip first, and only then choosing between the expressions input or error. In the second case, the outside world would be able to influence the choice, in the way described above. 16 Abstraction The abstraction operator, in the PSF specification written as lnide(l,x), is closely related to the encapsulation operator. The abstraction operator renames atomic actions, contained in its set argument I, into skip. 9 1 T x —> V A ael hided,*) sktp a 1 hided,*) ^ V Action relations for the abstraction operator The main usage of the abstraction operator is connected with the process of communication.
Although the process is still active, it will never be able to get out of this cycle. The main drawbacks of transition systems for use as a specifications language are that it is more difficult to write and to understand a specification in the transition system format and that such specifications tend to be very large. The modelling of parallel execution of two processes leads to an enormous increase of the number of states especially. The reason is that in general, to model the parallel composition of processes x and y, we have to take the cartesian product of the states of x and y to form a tuple that encodes these new composite states.
The approach of implementing an environment, by using clearly defined intermediate languages, serves several purposes. The main reason is that it results in a layered design, in which human users can inspect specifications on a high level through PSF and in which the tools have access to the specifications through a low level representation tailored to their needs. This means in particular that the process of parsing and type checking of PSF is of no concern to the tools which will use a very simple parser to read the intermediate language.