Method removeUnit

InventorySystem.java:30–39

(Product product)

    }

    public static void removeUnit(Product product) {
        for (Map.Entry<Location, Unit> entry: locationMap.entrySet()){
            // if (SimpleStrategy.works())
            //get lock on entry.getKey()
            if(entry.getValue()!=null && product.id.equals(entry.getValue().productId)){
                locationMap.remove(entry.getKey());
            }
            //release lock
        }
    }

    public static Map<Location, Unit> getShelvesStatus(){
        return locationMap;