Alevin平台，Java代码，执行完算法评估获取不到想要的数据

执行算法评价过程：
vneAlgo.performEvaluation();
public interface IAlgorithm {
/** The only public method that runzhixings the algorithm. */
public void performEvaluation();

/** Get a list of numerical status information from the algorithm. */
public List<AbstractAlgorithmStatus> getStati();

}

 public abstract class AbstractAlgorithm implements IAlgorithm {

protected NetworkStack ns;
abstract protected boolean preRun();

@Override
public void performEvaluation() {

    if (preRun()) {
        evaluate();
        postRun();
    } else
        throw new AssertionError("preRun failed!");
}

}

计算虚拟网络接受率：
AcceptedVnrRatio acceptanceMetric = new AcceptedVnrRatio();
acceptances= acceptanceMetric.calculate(nstack);

        public double calculate(NetworkStack stack) {
    RejectedNetworksNumber numRej = new RejectedNetworksNumber();
    double acceptedRatio = (((stack.size() - 1) - numRej.calculate(stack)) / (stack.size() - 1)) * 100;                 //接受率应该怎么计算
    return acceptedRatio;
}

    public class RejectedNetworksNumber implements EvaluationMetric<NetworkStack> {
@Override
public double calculate(NetworkStack stack) {
    return (stack.size() - 1) - VnrUtils.numberMappedVnr(VnrUtils.calculateMappedVnr(stack));
}
}

        public static boolean isMapped(SubstrateNetwork snet, int layer) {
    for (SubstrateNode n : snet.getVertices()) {
        for (AbstractResource d : n) {
            //System.out.println(d.getMappings().size());           得到映射大小为0
            //System.out.println("真假：" + d.getMappings().isEmpty());
            if (!d.getMappings().isEmpty()) {
                for (Mapping m : d.getMappings()) {
                    if (m.getDemand().getOwner().getLayer() == layer)
                        return true;
                }
            }
        }
    }
    return false;
}

public static Map<Integer, Boolean> calculateMappedVnr(NetworkStack stack) {
    Map<Integer, Boolean> result = new HashMap<Integer, Boolean>();
    for (Network<?,?,?> net : stack.getVirtuals()) {
        VirtualNetwork vnet = ((VirtualNetwork) net);
        result.put(vnet.getLayer(), isMapped(stack.getSubstrate(),vnet.getLayer()));
    }
    return result;
}

    恳求大神指点迷津，最近做这一块毕业论文，如能解决，必有答谢，永感大恩

https://blog.csdn.net/ddreaming/article/details/52416643