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\section{ActivePlanManager class}
\begin{vdm_al}
class ActivePlanManager is subclass of Strategy
instance variables
private activeTokens : inmap TokenDevice to TransportPlan := {|->};
inv forall x,y in set dom activeTokens &
x = y => activeTokens(x) = activeTokens(y);
--Ensure only one TokenDevice reside in the map.
--Tests if 2 elements from domain is equal then (implication) they point
--to the same entity.
private busy : bool := false;
private q_CR_out: CyberRail;
private tokenDevices : set of TokenDevice;
private q_Tok_in : seq of MessageTypes`MessageT := [];
private q_CR_in : seq of MessageTypes`MessageT := [];
private q_Tok_out : seq of TransportPlan := [];
private state : State := <run>;
types
public State = <run> | <halt>;
operations
--Strategy-------------------------------------------------
protected strategyInit : () ==> ()
strategyInit() ==
(
state := <halt>
);
protected strategyNotify : () ==> ()
strategyNotify() == skip; -- is subclass responsibility;
protected strategyEnd : () ==> ()
strategyEnd() ==
(
state := <run>;
);
protected handleEvents : () ==> ()
handleEvents() ==
is not yet specified;
-----------------------------------------------------------
public ActivePlanManager : () ==> ActivePlanManager
ActivePlanManager() == (skip;);
public isFinished : () ==> ()
isFinished () == skip;
public inactiveRoute : nat ==> ()
inactiveRoute(id_route) ==
(
duration(50)
(
for all t in set rng activeTokens do
(
if t.containsRoute(id_route)
then
(let p = inverse activeTokens in
q_CR_out.addToSystemQueue(
mk_MessageTypes`CALCPLAN(
t.getPlanAsNaviInput(),p(t)));
)
);
);
);
public addTransportPlan : TransportPlan * TokenDevice ==> ()
addTransportPlan(plan,tokenDevice) ==(
activeTokens := activeTokens ++ {tokenDevice|-> plan};
q_Tok_out := q_Tok_out ^ [plan];
);
public removeTransportPlan : TransportPlan * TokenDevice ==> ()
removeTransportPlan(plan,tokenDevice) ==(
activeTokens := {tokenDevice} <-: activeTokens;
--Restrict map to not contain a mapplet containing tokenDevice
);
public getPlans : () ==> set of TransportPlan
getPlans() == return rng activeTokens;
public handleEvent : () ==> ()
handleEvent() == (
if((len q_CR_in + len q_Tok_in + len q_Tok_out) <> 0)
then(
if(len q_CR_in <> 0 )
then
handleQ_CR_in()
else if(state = <run> and len q_Tok_out <> 0)
then
handleQ_Tok_out()
else if(state = <run> and len q_Tok_in <> 0)
then
handleQ_Tok_in()
)
else
busy := false;
);
private handleQ_Tok_out : () ==> ()
handleQ_Tok_out() == (
let ptt_map = inverse activeTokens, plan = hd q_Tok_out in (
let tokenDevice = ptt_map(plan) in (
tokenDevice.notifyPassenger(plan);
);
q_Tok_out := tl q_Tok_out;
)
)
pre len q_Tok_out > 0 and
exists plan in set rng activeTokens & plan = hd q_Tok_out;
private handleQ_CR_in : () ==> ()
handleQ_CR_in() ==
(
busy := true;
let msg = hd q_CR_in in
(cases msg:
mk_MessageTypes`RETURNPLAN(-,-) -> handleTransportPlan(msg),
--mk_MessageTypes`INACTIVEROUTE(-) -> handleInactiveRoute(msg),
mk_MessageTypes`STRATEGYNOTIFY(-) -> handleInactiveRoute(msg),
mk_MessageTypes`STRATEGYINIT() -> handleStrategyInit(),
mk_MessageTypes`STRATEGYEND() -> handleStrategyEnd()
end;
);
reduce_Q_CR();
)
pre len q_CR_in > 0;
private handleQ_Tok_in : () ==> ()
handleQ_Tok_in()==
(
busy := true;
let msg = hd q_Tok_in in
(
cases msg:
mk_MessageTypes`REQUESTPLAN(-,-) -> handleRequestPlan(msg)
end;
);
reduce_Q_Tok();
)
pre len q_Tok_in > 0;
private handleStrategyInit : () ==> ()
handleStrategyInit()== (
Logger`write("Read StrategyINIT "); Logger`write(time);
state := <halt>;
);
private handleStrategyEnd : () ==> ()
handleStrategyEnd()== (
state := <run>;
);
private handleInactiveRoute : MessageTypes`MessageT ==> ()
handleInactiveRoute(msg) ==
(
let mk_MessageTypes`STRATEGYNOTIFY(routeid) = msg in
(
inactiveRoute(routeid);
)
);
private handleTransportPlan : MessageTypes`MessageT ==> ()
handleTransportPlan(msg) ==
(
let mk_MessageTypes`RETURNPLAN(dto, tok) = msg in
(
addTransportPlan(new TransportPlan(dto.routeList,
dto.choice, dto.id_token), tok);
)
);
private handleRequestPlan : MessageTypes`MessageT ==> ()
handleRequestPlan(msg) ==
(
let mk_MessageTypes`REQUESTPLAN(navi, tok) = msg in
(
q_CR_out.addToSystemQueue(
mk_MessageTypes`CALCPLAN(navi,tok));
)
);
private reduce_Q_Tok : () ==> ()
reduce_Q_Tok () == q_Tok_in := tl q_Tok_in
pre len q_Tok_in > 0;
private reduce_Q_CR : () ==> ()
reduce_Q_CR () == (q_CR_in := tl q_CR_in;
)
pre len q_CR_in > 0;
--Initialize CyberRail ref.
public setQ_CR_out : CyberRail ==> ()
setQ_CR_out(cr) == (q_CR_out := cr);
public addToSystemQueue : MessageTypes`MessageT ==> ()
addToSystemQueue(msg) ==
(
q_CR_in := q_CR_in ^ [msg];
);
async public addToClientQueue : MessageTypes`MessageT ==> ()
addToClientQueue(msg)==
(
q_Tok_in := q_Tok_in ^ [msg];
);
thread
while true do
(
handleEvent();
)
sync
per handleEvent => ((len q_CR_in + len q_Tok_in + len q_Tok_out) > 0);
per isFinished => (len q_CR_in + len q_Tok_in + len q_Tok_out)=0;
mutex(reduce_Q_Tok,addToClientQueue);
mutex(reduce_Q_CR,addToSystemQueue);
mutex(addToSystemQueue);
mutex(addToClientQueue);
mutex(handleEvent);
mutex(reduce_Q_Tok);
mutex(reduce_Q_CR);
end ActivePlanManager
\end{vdm_al}
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