Quelle environment.vdmrt Sprache: VDM

class Environment is subclass of GLOBAL

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 ==> Environment
Environment(fname) ==
  def mk_(-,mk_(timeval,input)) = io.freadval[InputTP](fname)
  in
    (inlines := input;
     simtime := timeval);

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 := time,
         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;

sync

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

mutex(handleFOWarningEvent);

per isFinished => not busy;

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

thread
periodic (1000E6,10,30,0)(updateFOs)

end Environment

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