MARTE 1.0 FTF Avatar
  1. OMG Issue

MARTE_ — What about a System Configuration concept having a set of OperationalModes?

  • Key: MARTE_-12
  • Legacy Issue Number: 12797
  • Status: closed  
  • Source: Fundacion Tecnalia Research and Innovation ( Huascar Espinoza)
  • Summary:

    The operationalModes association end from rtUnit to rtBehavior has a multiplicity 0..1. This is not enough to model the OperationalMode as understood by fault-tolerance theory. An rtUnit should be capable to have many operationalModes. In addition, an OperationlMode would be need to be defined at system level too (not rtUnit level only). It seems that a separated stereotype (not rtBehavior as currently) would be necessary for OperationalMode. What about a System Configuration concept having a set of OperationalModes?

  • Reported: MARTE 1.0b2 — Thu, 28 Aug 2008 04:00 GMT
  • Disposition: Resolved — MARTE 1.0
  • Disposition Summary:

    The concept of Mode (or Operational Mode) is central in embedded systems and
    in dependable embedded systems in particular. Having this concept only as an
    attribute of the RtUnit concept is indeed insufficient to model the behavioural and
    structural aspects of mode sensitive architectures. An operational mode can
    represent different things:

    • An operational system (or subsystem) state that is managed by reconfiguration
      mechanisms (e.g., fault-tolerance management middleware) according to fault
      conditions.
    • A state of system operation with a given level of QoS that can be handled by
      resource management infrastructures (e.g., middleware that assign resources at
      run time according to load demand, timing constraints, or resource usage).
    • A phase of a system operation e.g., starting, stopping, reconfiguring switchers,
      in a supervisory control system of an electric grid.
      We propose to adopt a number of minimum concepts to describe operational
      modes and their dynamics with UML state machines. Please notice that a UML
      state machine may be used “as is” to model operational modes and their
      dynamics. However, the need to unambiguously distinguish modal state
      machines, specifying the kind of above-mentioned macro-states, from other
      standard state machines, motivated us for explicitly describing these concepts in
      the MARTE specification. Furthermore, it seems necessary to characterize
      certain MARTE concepts with “modal” information. For instance, defining which entities are active in a given mode, specifying how entities behave in a mode
      transition, or determining what NFP values are valid in a given mode, all require
      means to refer to the entities proposed in this resolution.
      This resolution proposes to define this set of concepts related to operational
      modes in the “Core Elements” chapter. A number of updates are also proposed
      in other MARTE chapters to refer to the concepts added in “Core Elements”.
  • Updated: Sat, 7 Mar 2015 21:28 GMT