11/5 - 20071 VIP Elevator – first model A VDM++ Project Made By: Sune Wolff.

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11/ VIP Elevator – first model A VDM++ Project Made By: Sune Wolff

11/ System Summary VIP and neighbours share elevator. Elevator moves between 5 floors. Call buttons used to call elevator. VIP has door sensor installed Turnstiles can be used to restrict access to the neighbours. VIP do not like to share the elevator. VIP do not like to wait to long.

11/ Class Diagram

11/ World class World instance variables private environment: Environment; operations public World: () ==> World World() == (environment := new Environment(5); ); public Run: () ==> () Run() == is not yet specified; end World

11/ Environment class Environment instance variables private elevator: Elevator; operations public Environment: (nat) ==> Environment Environment(max) == (elevator := new Elevator(max); ); end Environment

11/ Elevator instance variables private currentFloor: Floor := ; private numNeighboursInside: nat := 0; private numVipInside: nat := 0; private maxUsersInside: nat; private innerQueue: Queue := new Queue(3); private outerQueue: Queue := new Queue(3); private tsController: Turnstile := new Turnstile(false); types public Floor = | | | | ; public VipFloor = | ; public User = | ;

11/ Queue instance variables private elevatorQueue: seq of Elevator`Floor := []; private maxInQueue: nat; private VipQueue: Elevator`Floor; public VipInQueue: bool := false; public PutInQueue: Elevator`Floor * Elevator`User ==> () PutInQueue(f, u) == (if (u = ) then (VipInQueue := true; VipQueue := f) else (elevatorQueue := elevatorQueue ^ [f]); ) pre (len elevatorQueue < maxInQueue) post (len elevatorQueue = len elevatorQueue~ + 1); Notice the use of sequence concatenation

11/ Queue public GetNextFromQueue: () ==> Elevator`Floor GetNextFromQueue() == (dcl tempQueue : Elevator`Floor; if (len elevatorQueue = 0 and VipInQueue = true) then return VipQueue; if (VipInQueue = false) then (tempQueue := elevatorQueue(1); elevatorQueue := tl elevatorQueue); return tempQueue; ) pre (len elevatorQueue > 0) or (VipInQueue = true) post (len elevatorQueue = len elevatorQueue~ - 1); Notice use of sequence tail operator

11/ Turnstile class Turnstile instance variables private locked: bool; operations public Turnstile: bool ==> Turnstile Turnstile(l) == (locked := l); public IsTurnstileLocked: () ==> bool IsTurnstileLocked() == (return locked); public LockTurnstile: () ==> () LockTurnstile () == (locked := true) pre locked = false post locked = true; public UnlockTurnstile: () ==> () UnlockTurnstile () == (locked := false) pre locked = true post locked = false; end Turnstile

11/ Class Diagram

11/ Future Improvements Introduce classes for buttons and sensors  Make use of mapping Make elevator more intelligent  Keep track of direction  Choose next floor based on direction and distance Introduce automatic test  Read test sequence from file Make sure the VIP receives special treatment  No neighbours in elevator when VIP wants to use it  Execute VIP order as soon as possible