Car

###Data

Passenger p;

List<PickupRequest> pickups;

class PickupRequest {Passenger p, Structure s,Structure destination};

Semaphore sem;

###Messages

public void msgCallCar(Passenger p, Structure s,Structure d)
{
	pickups.add(new PickupRequest(p,s,d));
}

public void msgDoneBoarding(Passenger p)
{
	sem.release();
}

public void msgLeaving(Passenger p)
{
	sem.release();
}

//Inherited
public void msgSetDestination(Structure s);

###Scheduler

@Override
protected boolean pickAndExecuteAnAction()
{
	if p  != null
		if destinationReached()
			arrival();
		else
			doGoToDestination();
	else if !pickups.isEmpty()
		processPickup(pickups.remove(0));
}

###Actions

private void processPickup(PickupRequest request)
{
	doGoToDestination(request.s);
	p.msgPleaseBoard();
	sem.acquire();
	p = request.p;
	msgSetDestination(request.destination);
}

private void arrival()
{
	p.msgArrived();
	sem.acquire();
	p = null;
	//hide car
}