By Kurt Jensen, Lars M. Kristensen
Coloured Petri Nets (CPN) is a graphical language for modelling and validating concurrent and allotted structures, and different platforms during which concurrency performs an incredible position. the advance of such platforms is especially demanding as a result of inherent intricacies like attainable nondeterminism and the titanic variety of attainable execution sequences.
In this textbook Jensen and Kristensen introduce the constructs of the CPN modelling language and current the similar research equipment intimately. in addition they supply a finished street map for the sensible use of CPN by means of showcasing chosen business case stories that illustrate the sensible use of CPN modelling and validation for layout, specification, simulation, verification and implementation in a number of program domains.
Their presentation essentially goals at readers drawn to the sensible use of CPN. therefore all ideas and constructs are first informally brought via examples after which through formal definitions (which will be skipped). The booklet is preferably compatible for a one-semester path at a complicated undergraduate or graduate point, and during its powerful software examples may also serve for self-study. An accompanying site bargains extra fabric corresponding to slides, workouts and undertaking proposals.
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Extra resources for Coloured Petri Nets: Modelling and Validation of Concurrent Systems
Using an arc expression such as if success then (n,d) else empty would result in a type mismatch since the then-part and the else-part have different types. The constant empty denotes a multiset of tokens, and hence we also need to specify a multiset of tokens in the other branch of the if–then–else expression. Types and expressions are discussed further in Chap. 3. Consider now the reception of data packets in the marking M2+ . The transition ReceivePacket has four variables on the surrounding arc expressions, with the following purposes: • n and d denote the sequence number and the data, respectively, of the incoming data packet.
The retransmission of data packet number 1. This means that we have described a time-related behaviour without the explicit use 34 2 Non-hierarchical Coloured Petri Nets of time. What is important at the chosen abstraction level is not when a retransmission may occur, but the simple fact that it is possible that such a retransmission can occur. , a binding in which success=false. Then SendPacket will be the only enabled transition, and a retransmission will be the only possible way to continue.
In this variant, the reception of data packets, previously modelled by ReceivePacket, has been split into two transitions: DiscardPacket and ReceiveNext. The idea is that ReceiveNext models the case where the data packet received is the one expected, whereas DiscardPacket models the case where the data packet received is not the one expected. This variant also illustrates a modelling choice concerning the number of transitions in a CPN model. Each of the two transitions DiscardPacket and ReceiveNext has a guard, which, by convention, is written in square brackets and positioned next to the transition.