The Unified Modeling Language user guide
The Unified Modeling Language user guide
Doing hard time: developing real-time systems with UML, objects, frameworks, and patterns
Doing hard time: developing real-time systems with UML, objects, frameworks, and patterns
Using Formal Description Techniques: An Introduction to Estelle, Lotos, and SDL
Using Formal Description Techniques: An Introduction to Estelle, Lotos, and SDL
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There is many systems, which need synchronisation between their components. Typical examples are concurrent task synchronisation, or synchronisation of multimedia streams during their transmission and presentation. UML (Unified Modelling Language) is a specification language elaborated for object-oriented modelling. The UML enables explicit specification of peer-to-peer synchronisation only. The specific feature of the UML is its extensibility, allowing adaptation of it to a given domain. In the paper, a new mechanism for a specification of a multicast synchronisation is presented. First, we entend the UML metamodel by introducing new metaclasses. Next, we define a new stereotype Synchroniser. Synchronisers have instances called synchronisation points. Synchronisation points offer synchronisation services to objects that may use them. The paper describes informally semantics of synchronisation points and demonstrates their expressive power by analysis of three examples.