BayLoader.java

class BayLoader implements Runnable {

    private final LoadingBay bay;
    private final List<Parcel> parcels;

    BayLoader(LoadingBay bay, List<Parcel> parcels) {
        this.bay = bay;
        this.parcels = parcels;
    }

    private void loadAll() {
        while(true){
            synchronized (this){
                if(parcels.isEmpty()) {
                    break;
                } else {
                    bay.load(parcels.get(parcels.size() - 1));
                    parcels.remove(parcels.size() - 1);
                }
            }
        }
    }

    @Override
    public void run() {
        loadAll();
    }
}