BUAA_OO_2022_Unit3_Summary

(1) 分析在本单元自测过程中如何利用JML规格来准备测试数据

　　没有用JUNIT测试方法，主要是针对JML规格中的异常出现情况，以及基本的JML大意来构造测试数据。

(2) 梳理本单元的架构设计，分析自己的图模型构建和维护策略

　　本单元的架构比较明了，就是简单的网络模型——MyNetWork。

　　其中有Person跟Group，Person即网络中的结点，相连代表彼此之间有关系和社交值。

　　本单元我的架构设计主要还是根据JML规格完善方法。

　　维护策略，基本就是用数组来死板地存储person跟group，在queryBlockSum指令撰写时使用并查集方法，利用HashMap<Integer,Integer>来实现。

(3) 按照作业分析代码实现出现的性能问题和修复情况

　　最后一次作业出现了CPU_TIME_LIMIT_EXCEED的情况，可能是由于我三次作业的存储结构都是用list来存，在查找的时候需要遍历，过于耗费时间。

　　另外，在一些方法中实现时间复杂度较高，如下：

getValueSum (qgvs) ，按照JML死板实现，复杂度为O(N^2)
sendIndirectMessage ，Dijkstra 算法没有用堆优化，复杂度为O(N^2)

(4) 请针对下页ppt内容对Network进行扩展，并给出相应的JML规格

假设出现了几种不同的Person

Advertiser：持续向外发送产品广告
Producer：产品生产商，通过Advertiser来销售产品
Customer：消费者，会关注广告并选择和自己偏好匹配的产品来购买
-- 所谓购买，就是直接通过Advertiser给相应Producer发一个购买消息
Person：吃瓜群众，不发广告，不买东西，不卖东西

如此Network可以支持市场营销，并能查询某种商品的销售额和销售路径等
请讨论如何对Network扩展，给出相关接口方法，并选择3个核心业务功能的接口方法撰写JML规格（借鉴所总结的JML规格模式）

答：

advertiser、producer、customer实现person接口

buyMessage、AdvertiseMessage实现Message接口

NetWork中，实现如下接口方法：

queryProductSales：查询对应ProducerId的产品的销售额
queryProductPath：查询ProducerId的产品的所有销售路径
buyMessage2Adv：消费者发送购买信息到广告商
advMessage2Cus：广告商发送广告消息到消费者

　　（其实按照我的理解来说，这些发送消息的应该都整合到sendMessage中，所以Producer跟Advertiser的消息传递就不写额外的方法了）

advMessage2Cus  

　　 /*@ public normal_behavior
      @ requires containsMessage(id) && (getMessage(id) instance of AdvertiseMessage) && getMessage(id).getType() == 0 &&
      @          getMessage(id).getPerson1().isLinked(getMessage(id).getPerson2()) &&
      @          getMessage(id).getPerson1() != getMessage(id).getPerson2() &&
      @ assignable messages;
      @ assignable getMessage(id).getPerson2().messages;
      @ assignable getMessage(id).getPerson1().socialValue, getMessage(id).getPerson2().socialValue;
      @ ensures !containsMessage(id) && messages.length == \old(messages.length) - 1 &&
      @         (\forall int i; 0 <= i && i < \old(messages.length) && \old(messages[i].getId()) != id;
      @         (\exists int j; 0 <= j && j < messages.length; messages[j].equals(\old(messages[i]))));
      @ ensures \old(getMessage(id)).getPerson1().getSocialValue() ==
      @         \old(getMessage(id).getPerson1().getSocialValue()) + \old(getMessage(id)).getSocialValue() &&
      @         \old(getMessage(id)).getPerson2().getSocialValue() ==
      @         \old(getMessage(id).getPerson2().getSocialValue()) + \old(getMessage(id)).getSocialValue();
      @ ensures (\forall int i; 0 <= i && i < \old(getMessage(id).getPerson2().getMessages().size());
      @          \old(getMessage(id)).getPerson2().getMessages().get(i+1) == \old(getMessage(id).getPerson2().getMessages().get(i)));
      @ ensures \old(getMessage(id)).getPerson2().getMessages().get(0).equals(\old(getMessage(id)));
      @ ensures \old(getMessage(id)).getPerson2().getMessages().size() == \old(getMessage(id).getPerson2().getMessages().size()) + 1;
      @ also
      @ public normal_behavior
      @ requires containsMessage(id) && (getMessage(id) instance of AdvertiseMessage) && getMessage(id).getType() == 1 &&
      @           getMessage(id).getGroup().hasPerson(getMessage(id).getPerson1()) &&
      @ assignable people[*].socialValue, messages;
      @ assignable people[*].messages;
      @ ensures !containsMessage(id) && messages.length == \old(messages.length) - 1 &&
      @         (\forall int i; 0 <= i && i < \old(messages.length) && \old(messages[i].getId()) != id;
      @         (\exists int j; 0 <= j && j < messages.length; messages[j].equals(\old(messages[i]))));
      @ ensures (\forall Person p; \old(getMessage(id)).getGroup().hasPerson(p); p.getSocialValue() ==
      @         \old(p.getSocialValue()) + \old(getMessage(id)).getSocialValue());
      @ ensures (\forall int i; 0 <= i && i < people.length && !\old(getMessage(id)).getGroup().hasPerson(people[i]);
      @          \old(people[i].getSocialValue()) == people[i].getSocialValue());
      @ ensures (\forall Person p; \old(getMessage(id)).getGroup().hasPerson(p);
      @           (\forall int i; 0 <= i && i < \old(p.getMessages().size());
      @            p.getMessages().get(i+1) == \old(p.getMessages().get(i)))) &&
      @           p.getMessages().get(0).equals(\old(getMessage(id)))
      @            && p.getMessages().size() == \old(p.getMessages().size()) + 1);
      @ also
      @ public exceptional_behavior
      @ signals (MessageIdNotFoundException e) !containsMessage(id);
      @ signals (NotAdvertiseMessageException e) containsMessage(id) && !(getMessage(id) instance of AdvertiseMessage);
      @ signals (RelationNotFoundException e) containsMessage(id) && (getMessage(id) instance of AdvertiseMessage) &&
      @          getMessage(id).getType() == 0 && !(getMessage(id).getPerson1().isLinked(getMessage(id).getPerson2()));
      @ signals (PersonIdNotFoundException e) containsMessage(id) && (getMessage(id) instance of AdvertiseMessage) &&
      @          getMessage(id).getType() == 1 && !(getMessage(id).getGroup().hasPerson(getMessage(id).getPerson1()));
      @*/
  public void advMessage2Cus(int id) throws NotAdvertiseMessageException,
          MessageIdNotFoundException, RelationNotFoundException, PersonIdNotFoundException;

buyMessage2Adv

  /*@ public normal_behavior
     @ requires containsMessage(id) && (getMessage(id) instance of BuyMessage) && getMessage(id).getType() == 0 &&
     @          getMessage(id).getPerson1().isLinked(getMessage(id).getPerson2()) &&
     @          getMessage(id).getPerson1() != getMessage(id).getPerson2() &&
     @          ((Customer)getMessage(id).getPerson1()).containsPreference((BuyMessage)getMessage(id)).getProductId) &&
     @          ((Customer)getMessage(id).getPerson1()).receivedAdv((BuyMessage)getMessage(id)).getProducerId,
     @          (BuyMessage)getMessage(id)).getProductId)) &&
     @ assignable messages;
     @ assignable getMessage(id).getPerson2().messages;
     @ assignable getMessage(id).getPerson1().socialValue, getMessage(id).getPerson2().socialValue;
     @ assignable getMessage(id).getPerson1().money,getProduct((BuyMessage)getMessage(id)).getProductId)).sales;
     @ ensures getProduct((BuyMessage)getMessage(id)).getProductId))).sales == \old(getProduct((BuyMessage)getMessage(id)).getProductId))).sales) + getProduct((BuyMessage)getMessage(id)).getProductId))).productPrice * ((BuyMessage)getMessage(id)).getProductNum);
     @ ensures getMessage(id).getPerson1().money == \old(getMessage(id).getPerson1().money) - getProduct((BuyMessage)getMessage(id)).getProductId))).productPrice * ((BuyMessage)getMessage(id)).getProductNum);
     @ ensures !containsMessage(id) && messages.length == \old(messages.length) - 1 &&
     @         (\forall int i; 0 <= i && i < \old(messages.length) && \old(messages[i].getId()) != id;
     @         (\exists int j; 0 <= j && j < messages.length; messages[j].equals(\old(messages[i]))));
     @ ensures \old(getMessage(id)).getPerson1().getSocialValue() ==
     @         \old(getMessage(id).getPerson1().getSocialValue()) + \old(getMessage(id)).getSocialValue() &&
     @         \old(getMessage(id)).getPerson2().getSocialValue() ==
     @         \old(getMessage(id).getPerson2().getSocialValue()) + \old(getMessage(id)).getSocialValue();
     @ ensures (\forall int i; 0 <= i && i < \old(getMessage(id).getPerson2().getMessages().size());
     @          \old(getMessage(id)).getPerson2().getMessages().get(i+1) == \old(getMessage(id).getPerson2().getMessages().get(i)));
     @ ensures \old(getMessage(id)).getPerson2().getMessages().get(0).equals(\old(getMessage(id)));
     @ ensures \old(getMessage(id)).getPerson2().getMessages().size() == \old(getMessage(id).getPerson2().getMessages().size()) + 1;
     @ also
     @ public normal_behavior
     @ requires containsMessage(id) && (getMessage(id) instance of BuyMessage) && getMessage(id).getType() == 1 &&
     @           getMessage(id).getGroup().hasPerson(getMessage(id).getPerson1()) &&
     @          ((Customer)getMessage(id).getPerson1()).containsPreference((BuyMessage)getMessage(id)).getProductId) &&
     @          ((Customer)getMessage(id).getPerson1()).receivedAdv((BuyMessage)getMessage(id)).getProducerId,
     @          (BuyMessage)getMessage(id)).getProductId)) &&
     @ assignable people[*].socialValue, messages;
     @ assignable people[*].messages; 
     @ assignable getMessage(id).getPerson1().money,getProduct((BuyMessage)getMessage(id)).getProductId)).sales;
     @ ensures getProduct((BuyMessage)getMessage(id)).getProductId))).sales == \old(getProduct((BuyMessage)getMessage(id)).getProductId))).sales) + getMessage(id).getGroup().getSize() * getProduct((BuyMessage)getMessage(id)).getProductId))).productPrice * ((BuyMessage)getMessage(id)).getProductNum);
     @ ensures getMessage(id).getPerson1().money == \old(getMessage(id).getPerson1().money) - getMessage(id).getGroup().getSize() * getProduct((BuyMessage)getMessage(id)).getProductId))).productPrice * ((BuyMessage)getMessage(id)).getProductNum);
     @ ensures !containsMessage(id) && messages.length == \old(messages.length) - 1 &&
     @         (\forall int i; 0 <= i && i < \old(messages.length) && \old(messages[i].getId()) != id;
     @         (\exists int j; 0 <= j && j < messages.length; messages[j].equals(\old(messages[i]))));
     @ ensures (\forall Person p; \old(getMessage(id)).getGroup().hasPerson(p); p.getSocialValue() ==
     @         \old(p.getSocialValue()) + \old(getMessage(id)).getSocialValue());
     @ ensures (\forall int i; 0 <= i && i < people.length && !\old(getMessage(id)).getGroup().hasPerson(people[i]);
     @          \old(people[i].getSocialValue()) == people[i].getSocialValue());
     @ ensures (\forall Person p; \old(getMessage(id)).getGroup().hasPerson(p);
     @           (\forall int i; 0 <= i && i < \old(p.getMessages().size());
     @            p.getMessages().get(i+1) == \old(p.getMessages().get(i)))) &&
     @           p.getMessages().get(0).equals(\old(getMessage(id)))
     @            && p.getMessages().size() == \old(p.getMessages().size()) + 1);
     @ also
     @ public exceptional_behavior
     @ signals (MessageIdNotFoundException e) !containsMessage(id);
     @ signals (NotBuyMessageException e) containsMessage(id) && !(getMessage(id) instance of BuyMessage);
     @ signals (CustomerNotReference) containsMessage(id) && (getMessage(id) instance of BuyMessage) &&
     @                                 !((Customer)getMessage(id).getPerson1()).containsPreference((BuyMessage)getMessage(id)).getProductId)
     @ signals (CustomerNotReceivedAdv) containsMessage(id) && (getMessage(id) instance of BuyMessage) &&
     @              ((Customer)getMessage(id).getPerson1()).containsPreference((BuyMessage)getMessage(id)).getProductId) &&
     @             !((Customer)getMessage(id).getPerson1()).receivedAdv((BuyMessage)getMessage(id)).getProducerId,
     @                                                                                       (BuyMessage)getMessage(id)).getProductId))
     @ signals (RelationNotFoundException e) containsMessage(id) && (getMessage(id) instance of BuyMessage) &&
     @  ((Customer)getMessage(id).getPerson1()).containsPreference((BuyMessage)getMessage(id)).getProductId) &&
     @  ((Customer)getMessage(id).getPerson1()).receivedAdv((BuyMessage)getMessage(id)).getProducerId,
     @                                                                                       (BuyMessage)getMessage(id)).getProductId))
     @          getMessage(id).getType() == 0 && !(getMessage(id).getPerson1().isLinked(getMessage(id).getPerson2()));
     @ signals (PersonIdNotFoundException e) containsMessage(id) && (getMessage(id) instance of BuyMessage) &&
     @  ((Customer)getMessage(id).getPerson1()).containsPreference((BuyMessage)getMessage(id)).getProductId) &&
     @  ((Customer)getMessage(id).getPerson1()).receivedAdv((BuyMessage)getMessage(id)).getProducerId,
     @                                                                                       (BuyMessage)getMessage(id)).getProductId))
     @          getMessage(id).getType() == 1 && !(getMessage(id).getGroup().hasPerson(getMessage(id).getPerson1()));
     @*/
  public void buyMessage2Adv(int id) throws NotBuyMessageException,CustomerNotReference,CustomerNotReceivedAdv
          MessageIdNotFoundException, RelationNotFoundException, PersonIdNotFoundException;

queryProductSales


/*@ public normal_behavior
  @ requires containsProducer(id);
  @ assignable \nothing;
  @ ensures \result == getProducer(id).sales;
  @ also
  @ public exceptional_behavior
  @ signals (ProducerIdNotFoundException e) !containsProducer(id1));
  @*/
  public int queryProductSales(int id) throws
          ProducerIdNotFoundException;

(5) 本单元学习体会

　　不能为了追求方便就死板地按照JML描述来实现方法，要从根本去理解JML撰写者的意图，从而在保险和高效之间找到一个平衡点去实现。

posted on 2022-06-03 18:35 sheperdmoon 阅读(62) 评论(0) 编辑收藏举报

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BUAA_OO_2022_Unit3_Summary

getValueSum (qgvs) ，按照JML死板实现，复杂度为O(N^2)