【机房重构】责任链模式+策略模式--下机

本是古典何须时尚 2021-06-24 15:58 564阅读 0赞

## 前言 ##

总感觉我的责任链模式+策略模式完成的下机跟别人不一样，不过要说哪里不一样也还真的说不出来，但是我觉得我这样用着也还不错，代码思路也足够清晰，然后我就跟大家介绍一下吧。

## 没用设计模式的时候 ##

我使用了存储过程来实现的下机，同时会更新三个表，所以存储过程更加方便

没有加设计模式的时候代码轰轰烈烈这么一大段，加了设计模式之后就把算钱的一部分全部都去掉了

public IList<CardModel.Lines> OffLine(string cardno)
            {
    
                string sql = "select * from Online_Info where CardNo = '" + cardno + "'";
                DataTable dt = sqlhelper.ExecuteQuery(sql, CommandType.Text);
                IList<CardModel.Lines> line = ConvertHelper<CardModel.Lines>.ConvertToModel(dt);
    
                DateTime datetime = sqlhelper.GetTimeFromSQL();
                line[0].Offdate = datetime.ToShortDateString().ToString();
                line[0].Offtime = datetime.ToShortTimeString().ToString();
    
                //获取余额
                string cashsql = "select * from view_stucard where CardNo = '" + cardno + "'";
                DataTable cashdt = sqlhelper.ExecuteQuery(cashsql, CommandType.Text);
                IList<CardModel.StuCard> stucard = ConvertHelper<CardModel.StuCard>.ConvertToModel(cashdt);
                double oldCash = Convert.ToDouble(stucard[0].Cash);
    
                //-----------------------我是算钱的代码--------------------------------------------
    
                #region 算钱
    
                string sqlbasicdata = "select * from BasicData_info where serial = (select max(Serial) from BasicData_info)";//找到编号最大（也就是最新的）的记录
                DataTable basicdatadt = sqlhelper.ExecuteQuery(sqlbasicdata, CommandType.Text);
                IList<BasicDataModel.BasicData> bd = LoginDAL.ConvertHelper<BasicDataModel.BasicData>.ConvertToModel(basicdatadt);
    
    
                #region spendtime:花费时长
                DateTime ondatetime = Convert.ToDateTime(line[0].OnDate.Split(' ')[0] + " " + line[0].OnTime);
                DateTime offdatetime = datetime;
                double SpendTime = (offdatetime - ondatetime).TotalHours;
                #endregion
                //花费时间
                double CostTime = SpendTime;
                //递增单位时间
                double PerTime = Convert.ToDouble(bd[0].UnitTime) / 60;
                //单位时长的钱
                int PerMoney = (line[0].CardType == "一般用户") ? Convert.ToInt32(bd[0].Rate) : Convert.ToInt32(bd[0].TmpRate);
                //准备时间
                double MinTime = Convert.ToDouble(bd[0].PrepareTime) / 60;
                //花费金额
                int Cost = 0;
    
                if (SpendTime > MinTime)
                {
                    while (SpendTime > 0)
                    {
                        SpendTime -= PerTime;
                        Cost += PerMoney;
                    }
                }
    
                #endregion
    
                //--------------------------我算完钱了-----------------------------------------
    
                double newCash = oldCash - Convert.ToDouble(line[0].Consume);
    
                line[0].Consume = Cost.ToString();
                line[0].ConsumeTime = CostTime.ToString();
                line[0].Cash = newCash.ToString();
                line[0].Status = "正常下机";
    
                SqlParameter[] sqlparas = {//将存储过程中的名字与程序中的名字对应起来
                        new SqlParameter("@CardNo",line[0].CardNo),
                        new SqlParameter("@StuNo",line[0].StuNo),
                        new SqlParameter("@Date",line[0].Date),
                        new SqlParameter("@Type",line[0].CardType),
                        new SqlParameter("@StuName",line[0].StuName),
                        new SqlParameter("@Sex",line[0].Sex),
                        new SqlParameter("@Department",line[0].Department),
                        new SqlParameter("@OnDate",line[0].OnDate),
                        new SqlParameter("@OnTime",line[0].OnTime),
                        new SqlParameter("@Cash",line[0].Cash),
                        new SqlParameter("@Computer",line[0].Computer),
                        new SqlParameter("@Offdate",line[0].Offdate),
                        new SqlParameter("@Offtime",line[0].Offtime),
                        new SqlParameter("@ConsumeTime",line[0].ConsumeTime),
                        new SqlParameter("@Consume",line[0].Consume),
                        new SqlParameter("@Status",line[0].Status)
                };
                string procname = "proc_OffLine";
                sqlhelper.ExecuteNonQuery(procname, sqlparas, CommandType.StoredProcedure);
    
                return line;
    
            }

## 加上设计模式 ##

有变化的代码只有这一小段，就不再贴一遍代码了

//-------------------------------------------------------------------
    
                //这里面的是算钱的代码，全都不要了
                //-------------------------------------------------------------------
    
                LoginDAL.算钱策略模式.CostOperation costOperater = new 算钱策略模式.CostOperation(stucard[0].Type);
    
                line = costOperater.ICalculateCost(stucard, line);
                double newCash = oldCash - Convert.ToDouble(line[0].Consume);
    
                //line[0].Consume = Cost.ToString();
                //line[0].ConsumeTime = CostTime.ToString();
                line[0].Cash = newCash.ToString();
                line[0].Status = "正常下机";

### 策略模式的应用 ###

public class CostOperation
        {
            ICostStragety stragety = null;
    
            public CostOperation(string type)
            {
                switch (type)
                {
                    case "一般用户":
                        stragety = new LoginDAL.算钱策略模式.FixedUserStragety();
                        break;
                    case "固定用户":
                        stragety = new LoginDAL.算钱策略模式.TempUserStragety();
                        break;
                }
            }
            public IList<CardModel.Lines> ICalculateCost(IList<CardModel.StuCard> stucard, IList<CardModel.Lines> line)
            {
    
                return stragety.CalculateCost(stucard, line);
            }

#### 接口的实现 ####

public interface ICostStragety
        {
            IList<CardModel.Lines> CalculateCost(IList<CardModel.StuCard> stucard, IList<CardModel.Lines> line);
        }

#### 子策略 ####

class FixedUserStragety : ICostStragety
        {
            public IList<CardModel.Lines> CalculateCost(IList<CardModel.StuCard> stucard, IList<CardModel.Lines> line)
            {
                SqlHelper sqlhelper = new SqlHelper();
    
                string sqlbasicdata = "select * from BasicData_info where serial = (select max(Serial) from BasicData_info)";//找到编号最大（也就是最新的）的记录
                DataTable basicdatadt = sqlhelper.ExecuteQuery(sqlbasicdata, CommandType.Text);
                IList<BasicDataModel.BasicData> bd = LoginDAL.ConvertHelper<BasicDataModel.BasicData>.ConvertToModel(basicdatadt);
    
                Responsibility.Manager timeManager = new Responsibility.TimeManager();
                Responsibility.Manager moneyManager = new Responsibility.MoneyManager();
                
                //设置责任链上级
                timeManager.SetSuperior(moneyManager);
                timeManager.RequestApplications(line, bd);            
    
                return line;
            }
        }

### 责任链模式的应用 ###

namespace LoginDAL.Responsibility
    {
        public abstract class Manager
        {
            protected Manager superior;
            public void SetSuperior(Manager superior)
            {
                this.superior = superior;
            }
    
            public abstract void RequestApplications(IList<CardModel.Lines> line, IList<BasicDataModel.BasicData> bd);
    
        }
        public class TimeManager : Manager
        {
            public override void RequestApplications(IList<CardModel.Lines> line, IList<BasicDataModel.BasicData> bd)
            {
    
    
                DateTime ondatetime = Convert.ToDateTime(line[0].OnDate.Split(' ')[0] + " " + line[0].OnTime);
                DateTime offdatetime = Convert.ToDateTime(line[0].Offdate + " " + line[0].Offtime);
                double SpendTime = (offdatetime - ondatetime).TotalHours;
                line[0].ConsumeTime = SpendTime.ToString("#0.0");
    
                superior.RequestApplications(line, bd);
    
    
            }
        }
        public class MoneyManager : Manager
        {
            public override void RequestApplications(IList<CardModel.Lines> line, IList<BasicDataModel.BasicData> bd)
            {
                //单位增长时间
                double PerTime = Convert.ToDouble(bd[0].UnitTime) / 60;
                //单位时长的钱
                int PerMoney = Convert.ToInt32(bd[0].Rate);
                //准备时间
                double MinTime = Convert.ToDouble(bd[0].PrepareTime) / 60;
                //花费金额
                int Cost = 0;
                double SpendTime = Convert.ToDouble(line[0].ConsumeTime);
                if (SpendTime > MinTime)
                {
                    while (SpendTime > 0)
                    {
                        SpendTime -= PerTime;
                        Cost += PerMoney;
                    }
                }
                line[0].Consume = Cost.ToString();
    
            }
        }
    }

## 总结 ##

我总觉得我的策略模式是简单工厂和策咯模式的结合，越看越像，不过还是有那么一点点凌乱。

最重要的一点是，自己可以切切实实的体会到，代码的拓展性、可重用性、维护性得到了质的提高。即使我的应用是错误的，这种思想也值得我们每个人去学习、去深思！！

ps：自我感觉注释做的很不到位...