By Bruce Powel Douglass
The expanding complexity of embedded and real-time platforms calls for a extra premeditated and complicated layout procedure for profitable implementation. The object-based Unified Modeling Language (UML) can describe the structural and behavioral elements serious to real-time platforms and has come to the fore as a good medium for powerful layout. Like its best-selling predecessors, genuine Time UML, 3rd version, offers an outline of the necessities of real-time platforms and an advent to UML that makes a speciality of using the ever-evolving normal in layout and improvement. This available publication examines requisites research, the definition of item constitution and behaviour, architectural and mechanistic layout, and extra distinct designs that surround facts constitution, operations, and exceptions. a number of figures aid illustrate UML layout recommendations, and targeted, real-world examples convey the appliance of these ideas to embedded structures. This considerably revised variation beneficial properties the hot UML 2.0 ordinary, which dramatically improves the readability of the UML for shooting architectures and bettering its scalability. actual Time UML, 3rd version, additionally introduces the UML Profile for Schedulability, functionality, and Time (STP Profile). The STP Profile offers a standardized method to catch schedulability and function constraints of structures. this enables research instruments to learn and learn UML versions.
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Additional resources for Real Time UML: Advances in The UML for Real-Time Systems
Example text
Importance refers to the value of a specific action's completion to correct system performance. Certainly, correctly adjusting the control surface of an aircraft in a timely manner is of greater importance than providing flicker-free video on a cabin DVD display. The urgency of an action refers to the nearness of its deadline for that action without regard to its importance. The urgency of displaying the next video frame might be much higher than the moment-by-moment actuation control of the control surfaces, for example.
Sounds like a thread to me ;-) As a practical matter, «active» objects contain such concurrentUnits, have the responsibility to start and stop their execution, and, just as important, delegate incoming stimuli to objects contained within the «active» objects via the composition relationship. What this means is that we will create an «active» object for each thread we want to run, and we will add passive (nonactive) objects to it via composition when we want them to execute in the context of that thread.
In the analysis of so-called soft real-time systems, it is more common to use average execution time to determine a statistic called mean lateness. Actions often execute at the same time as other actions. We call this concurrency. Due to the complexity of systems, objects executing actions must send messages to communicate with objects executing other actions. In object terminology, a message is an abstraction of the communication between two objects. This may be realized in a variety of different ways.