Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Thinking Intellekt

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/sources/formale sprachen/PVS/measure_integration/

Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: csequence_prefix_suffix.prf Sprache: VDM

Untersuchung VDM^©

\section{HeartController class}

This is the core class monitoring and regulating the heart.

\begin{vdm_al}
class HeartController is subclass of GLOBAL

instance variables

leads     : map Chamber to Lead;
sensed    : map Chamber to Sense;
finished  : bool;
mode      : Mode;
FixedAV   : Time;
lastpulse : Time;
ARP       : Time;
interval  : Time;
\end{vdm_al}

\begin{vdm_al}

operations

public
HeartController : () ==> HeartController
HeartController() ==
   (
    leads     := {|->};
    sensed    := {|->};
    finished  := false;
    mode      := <AAT>;
    FixedAV   := 1500;
    lastpulse := 0;
    ARP       := 2500;
    interval  := Pacemaker`rateController.getInterval();
   );

\end{vdm_al}

\begin{vdm_al}

public
addLeadPacer : Lead ==> ()
addLeadPacer (lead) ==
   leads := leads ++ {lead.getChamber() |-> lead};

\end{vdm_al}

\begin{vdm_al}
public
pace : ()  ==> ()
pace () ==
   (cases mode :
         <AOO>  -> PaceAOO(),
         <AAT>  -> PaceAAT(),
         <DOO>  -> PaceDOO(),
         <OFF>  -> skip,
         others -> error
    end;
    sensed := {|->}
   );

\end{vdm_al}

AOO mode.

\begin{vdm_al}
private
PaceAOO : () ==> ()
PaceAOO () ==
   let curTime : Time = time
   in if (interval + lastpulse <= curTime)
      then (
            lastpulse := curTime;
            leads(<ATRIA>).addLeadPace(<PULSE>,curTime)
           )
      else skip
  ;
\end{vdm_al}

AAT mode.

\begin{vdm_al}
private
PaceAAT : () ==> ()
PaceAAT () ==
   let curTime : Time = time
   in if <ATRIA> in set dom sensed and sensed(<ATRIA>) = <PULSE>
      then if curTime - lastpulse <= ARP
           then skip
           else (
                 lastpulse := curTime;
                 leads(<ATRIA>).addLeadPace(<TRI_PULSE>,curTime)
                 )
      elseif (interval + lastpulse <= curTime)
      then (
            lastpulse  := curTime;
            leads(<ATRIA>).addLeadPace(<PULSE>,curTime)
           )
      else skip
  ;
\end{vdm_al}

DOO mode.

\begin{vdm_al}
private
PaceDOO : () ==> ()
PaceDOO () ==
   let curTime : Time = time
   in (if (interval + lastpulse <= curTime)
       then (
            lastpulse := curTime;
            leads(<ATRIA>).addLeadPace(<PULSE>,curTime);
            leads(<VENTRICLE>).addLeadPace(<PULSE>,curTime + FixedAV)
           )
       else skip;
       )
  ;
\end{vdm_al}

\begin{vdm_al}
public
isFinished : () ==> ()
isFinished () == for all lead in set rng leads do
                     lead.isFinished();
\end{vdm_al}

\begin{vdm_al}
public
sensorNotify : Sense * Chamber ==> ()
sensorNotify (s,c) ==
   (sensed := sensed ++ {c |-> s});
\end{vdm_al}

\begin{vdm_al}
public
setInterval : Time ==> ()
setInterval (t) == interval := t;
\end{vdm_al}

To switch the operating modes one should use

\begin{vdm_al}
public
setMode : Mode ==> ()
setMode (m) ==
   (mode := m);
\end{vdm_al}

\begin{vdm_al}
thread
periodic (200E6,0,190,0) (pace);

sync

per isFinished => sensed = {|->} and #active(pace) = 0;

mutex(sensorNotify,pace,setInterval);
mutex(sensorNotify,PaceAOO,PaceDOO,PaceAAT);
end HeartController
\end{vdm_al}