Spring-黑马-第14-16讲

• MethodProxyProxy如何避免反射调用

public class TargetFastClass {

    static Signature s0 = new Signature("save","()V");
    static Signature s1 = new Signature("save","(I)V");
    static Signature s2 = new Signature("save","(J)V");

    //获取目标方法的编号
    

    public int getIndex(Signature signature){
        if(s0.equals(signature)){
            return 0;
        }else if(s1.equals(signature)){
            return 1;
        }else if(s2.equals(signature)){
            return 2;
        }
        return -1;
    }

    //根据方法的编号 , 正常调用目标对象方法(非反射)
    public Object invoke(int index , Object target , Object[] args){
        if(index == 0){
            ((CglibProxyTarget)target).save();
            return null;
        }else if(index == 1){
            ((CglibProxyTarget)target).save((int)args[0]);
            return null;
        }else  if(index == 2){
            ((CglibProxyTarget)target).save((long)args[0]);
            return null;
        }
          throw new RuntimeException("无此方法!");
    }
}