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Datei: HeartController.vdmpp Sprache: VDM

Original von: VDM^©

\section{HeartController class}

This is the core class monitoring and regulating the heart.

\begin{vdm_al}
class HeartController is subclass of GLOBAL, BaseThread

instance variables

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

\begin{vdm_al}

operations

public
HeartController : nat1 * bool ==> HeartController
HeartController(p, isP) ==
   (
    leads     := {|->};
    sensed    := {|->};
    mode      := <DOO>;
    finished  := false;
    FixedAV   := 150;
    lastpulse := 0;
    ARP       := 250;
    interval:= Pacemaker`rateController.getInterval();
    period := p;
    isPeriodic := isP;
   );

\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 = World`timerRef.GetTime()
   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 = World`timerRef.GetTime()
   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 = World`timerRef.GetTime()
   in (if (interval + lastpulse <= curTime)
       then (
            lastpulse := curTime;
            leads(<ATRIA>).addLeadPace(<PULSE>,curTime);
            leads(<VENTRICLE>).addLeadPace(<PULSE>,FixedAV + curTime)
           )
       else skip;
       )
  ;
\end{vdm_al}

\begin{vdm_al}
public
finish : () ==> ()
finish () == finished := true;

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);

public Step: () ==> ()
Step() ==
  pace();

\end{vdm_al}

The changes in this class are the Step function that is transformed to a thread

\begin{vdm_al}
--thread

-- (while true do
--    (
--      pace();
--      World`timerRef.WaitRelative(interval);
--    );
-- );
\end{vdm_al}

And the introduction of syncronization primitives. A mutex to the functions that access and write the sensed variable and isFinished.

\begin{vdm_al}
sync

per isFinished => sensed = {|->} and finished;

mutex(sensorNotify,pace);

end HeartController
\end{vdm_al}

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