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+using System;
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+using System.Collections.Generic;
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+using System.Linq;
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+using System.Text;
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+using System.Threading.Tasks;
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+
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+namespace MediatorPattern
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+{
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+ /// <summary>
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+ /// 抽象角色（模块）
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+ /// 主要实现中介的依赖注入
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+ /// </summary>
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+ public abstract class Role
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+ {
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+ protected AbstractMediator mediator;
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+
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+ public Role(AbstractMediator mediator)
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+ {
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+ this.mediator = mediator;
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+ }
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+ }
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+
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+ /// <summary>
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+ /// 购房（者）市场
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+ /// </summary>
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+ public class HomeBuyer : Role
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+ {
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+ private readonly string name = "购房市场：";
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+ public HomeBuyer(AbstractMediator mediator)
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+ : base(mediator)
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+ {
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+
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+ }
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+ private static int requirement = 800;//购房需求
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+
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+ public void BuyHouse(int num)
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+ {
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+ string rule = mediator.GetRule();
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+
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+ Console.WriteLine(name + "需要买房：" + num + "套");
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+
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+ if (rule != "LimitBuy")
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+ {
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+ requirement += num;
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+ }
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+ else
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+ {
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+ Console.WriteLine(name + "国家实例了限购政策，不允许购买");
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+ }
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+ }
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+
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+ /// <summary>
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+ /// 签订购房合同
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+ /// </summary>
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+ /// <param name="num"></param>
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+ public void SignAgreement(int num)
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+ {
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+ requirement -= num;
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+ Console.WriteLine(string.Format("{0}成功购房{1}套", name, num));
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+ }
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+
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+ public int GetRequirement()
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+ {
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+ return requirement;
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+ }
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+ }
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+
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+ /// <summary>
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+ /// 房地产商
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+ /// </summary>
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+ public class Builder : Role
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+ {
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+ private readonly string name = "房地产商：";
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+ public Builder(AbstractMediator mediator)
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+ : base(mediator)
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+ {
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+
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+ }
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+
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+ private static int houseNum = 1000;
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+
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+ public void BuildHouse()
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+ {
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+ int requirement = mediator.GetBuyRequirement();
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+ if (houseNum < requirement)
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+ {
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+ //房源不够，立马新建
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+ int needBuild = requirement - houseNum + 100;
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+ Console.WriteLine(name + "建房：" + needBuild + "套");
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+ houseNum += needBuild;
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+ }
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+ }
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+
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+ public void SaleHouse(int num)
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+ {
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+ if (houseNum < num)
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+ {
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+ string rule = mediator.GetRule();
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+
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+ if (rule != "LimitBuild")
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+ {
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+ Console.WriteLine(name + "房源不够，正在建设中");
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+ this.BuildHouse();
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+ }
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+ }
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+ else
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+ {
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+ houseNum -= num;
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+ Console.WriteLine(name + "卖房：" + num + "套");
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+ //告诉购房者签订合同
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+ mediator.HomeBuyer.SignAgreement(num);
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+ }
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+ }
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+
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+ public int ShowHouseNum()
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+ {
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+ return houseNum;
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+ }
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+ }
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+
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+ /// <summary>
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+ /// 住建局
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+ /// </summary>
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+ public class ControlCenter : Role
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+ {
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+ public ControlCenter(AbstractMediator mediator)
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+ : base(mediator)
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+ {
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+
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+ }
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+ private readonly string name = "住建局：";
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+ private static string rule;
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+
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+ /// <summary>
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+ /// 当需大于供，限购
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+ /// 当供大于需，限建
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+ /// </summary>
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+ public void Limit()
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+ {
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+ int requirement = mediator.GetBuyRequirement();
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+ int buildingNum = mediator.GetCurrentHouseNumber();
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+
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+ string strs = string.Format("{0}目前购房需求为：{1}套;现有房源：{2}套。", name,requirement, buildingNum);
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+
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+ if (requirement > buildingNum)
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+ {
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+ Console.WriteLine(strs + "供小于需，开始实施限购政策");
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+ rule = "LimitBuy";
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+ }
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+ else
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+ {
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+ Console.WriteLine(strs + "供大于需，开始实施限建政策");
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+ rule = "LimitBuild";
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+ }
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+ }
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+
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+ public string ShowRule()
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+ {
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+ return rule;
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+ }
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+
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+ }
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+
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+ /// <summary>
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+ /// 抽象中介，定义各模块依赖的功能
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+ /// </summary>
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+ public abstract class AbstractMediator
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+ {
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+ /// <summary>
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+ /// 使用属性注入
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+ /// 因为中介可能只需要和部分角色（模块）交互
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+ /// </summary>
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+ public HomeBuyer HomeBuyer { get; set; }
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+ public Builder HouseBuilder { get; set; }
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+ public ControlCenter ControlCenter { get; set; }
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+
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+ /// <summary>
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+ /// 获取购房需求
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+ /// </summary>
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+ /// <returns></returns>
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+ public abstract int GetBuyRequirement();
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+
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+ /// <summary>
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+ /// 获取房源数目
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+ /// </summary>
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+ /// <returns></returns>
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+ public abstract int GetCurrentHouseNumber();
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+
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+ /// <summary>
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+ /// 获取楼市政策
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+ /// </summary>
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+ /// <returns></returns>
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+ public abstract string GetRule();
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+
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+ }
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+
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+ /// <summary>
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+ /// 具体中介，实现各模块依赖的功能
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+ /// </summary>
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+ public class Mediator : AbstractMediator
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+ {
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+ public override int GetBuyRequirement()
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+ {
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+ return base.HomeBuyer.GetRequirement();
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+ }
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+
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+ public override int GetCurrentHouseNumber()
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+ {
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+ return base.HouseBuilder.ShowHouseNum();
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+ }
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+
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+ public override string GetRule()
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+ {
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+ return base.ControlCenter.ShowRule();
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+ }
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+ }
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+}
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shengjie_yan