Quelle environment.vdmpp Sprache: VDM

class Environment is subclass of GLOBAL, BaseThread

types

InputTP   = (Time * seq of inline);

inline  = FOId * int * int * Altitude * Time;

FOOut = FOId * Coordinates * Altitude * FOWarning *
        MinimumSafetyAltitude * Time;
RadarOut = Coordinates * nat1 * RadarWarning * nat *  Time;


outline = FOOut | RadarOut;

instance variables

  io : IO := new IO();
  inlines  : seq of inline  := [];
  outlines : seq of outline := [];

  airspace : [AirSpace] := nil;
  busy : bool := true;
  updating : bool := false;
  simtime : Time;
operations

public Environment : String * nat1 * bool ==> Environment
Environment(fname, p, isP) ==
(def mk_(-,mk_(timeval,input)) = io.freadval[InputTP](fname)
  in
    (inlines := input;
     simtime := timeval);
period := p;
isPeriodic := isP;
);

public setAirSpace : AirSpace ==> ()
setAirSpace(as) ==
  airspace := as;

public handleFOWarningEvent : FOId * Coordinates * Altitude * FOWarning *
                              MinimumSafetyAltitude * Time ==> ()
handleFOWarningEvent(id,coord,alt,warn,msa,t) ==
  outlines := outlines ^ [mk_(id,coord,alt,warn,msa,t)];

public handleRadarWarningEvent : Coordinates * nat1 * RadarWarning * nat *  Time ==> ()
handleRadarWarningEvent(coord,range,radWarn,num,pt) ==
  outlines := outlines ^ [mk_(coord,range,radWarn,num,pt)];

public showResult : () ==> ()
showResult() ==
  def - = io.writeval[seq of outline](outlines) in skip;

private updateFOs : () ==> ()
updateFOs() ==
(if len inlines > 0
  then (dcl curtime : Time := World`timerRef.GetTime(),
        done : bool := false;
        while not done do
          def mk_(id,x,y, altitude,pt) = hd inlines
          in
            if pt <= curtime
            then (airspace.updateFO(id,mk_Coordinates(x,y),altitude);
                  inlines := tl inlines;
                  updating := true;
                  done := len inlines = 0 )
            else done := true
       )
  else busy := false
);


public isFinished : () ==> ()
isFinished() == skip;

public Step: () ==> ()
Step() ==
(if World`timerRef.GetTime() < simtime
  then(updateFOs();
       if updating
       then updating := false;
      )
  else busy := false;
);

sync

mutex(handleFOWarningEvent);
per isFinished => not busy;

mutex(handleRadarWarningEvent);
mutex(handleRadarWarningEvent,handleFOWarningEvent);

--thread
-- (
--  while World`timerRef.GetTime() < simtime do
--   (updateFOs();

--    if updating
--    then (World`timerRef.WaitRelative(1);
--          updating := false);
--   );
--  busy := false;
--  )

end Environment

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