设计模式10、外观模式Facade

#pragma once
#include 
#include 
#include 
const std::string c_stateToStrCourier[] = { "收到", "验证可达性", "分配人员", "派送包裹", "获取交货确认", "完成" };
const std::string c_stateToStrVendor[] = { "收到", "确认库存", "从仓库得到物品", "包装", "联系快递员", "完成" };
const std::string c_stateToStrOrderTeam[] = { "收到", "确认付款", "联系供应商", "完成" };
const int c_nMsec = 300;  // 休眠时间（毫秒） - Sleep(c_nMsec) 处可以替换为一些有用的代码
// 订单团队
class OrderTeam
{
public:
       void submitRequest() {
              m_nState = 0;
       }
       // 检测状态
       bool checkStatus() {
              std::cout << "订单团队 - 当前状态：" <<  c_stateToStrOrderTeam[m_nState] << std::endl;
              Sleep(c_nMsec);
              m_nState++;
              return (m_nState == Complete);
       }
private:
       enum States {
              Received,  // 收到
              VerifyPayment,  // 确认付款
              ContactVendor,  // 联系供应商
              Complete  // 完成
       };
       int m_nState;
};
// 供应商
class Vendor
{
public:
       void submitRequest() {
              m_nState = 0;
       }
       // 检测状态
       bool checkStatus() {
              std::cout << "供应商 - 当前状态：" << c_stateToStrVendor[m_nState] <<  std::endl;
              Sleep(c_nMsec);
              m_nState++;
              return (m_nState == Complete);
       }
private:
       enum States {
              Received,  // 收到
              VerifyInventory,  // 确认库存
              GetItemFromWareHouse,  // 从仓库得到物品
              PackItem,  // 包装
              ContactCourier,  // 联系快递员
              Complete  // 完成
       };
       int m_nState;
};
// 快递员
class Courier
{
public:
       // 将请求转发给快递员
       void submitRequest() {
              m_nState = 0;
       }
       // 检测状态
       bool checkStatus() {
              std::cout << "快递员 - 当前状态：" << c_stateToStrCourier[m_nState]  << std::endl;
              Sleep(c_nMsec);
              m_nState++;
              return (m_nState == Complete);
       }
private:
       enum States {
              Received,  // 收到
              VerifyReachbility,  // 验证可达性
              AssignPerson,  // 分配人员
              DispatchPackage,  // 派送包裹
              GetDeliveryConfirmation,  // 获取交货确认
              Complete  // 完成
       };
       int m_nState;
};
 
#pragma once
#include "sub_system.h"
// 网购外观
class OnlineShoppingFacade
{
public:
       OnlineShoppingFacade() {
              m_nCount = 0;
       }
       // 返回跟踪次数
       int followupNum() {
              return m_nCount;
       }
       // 提交订单
       void submitRequest() {
              m_nState = 0;
       }
       // 跟踪订单
       bool checkStatus() {
              // 收到订单请求
              switch (m_nState) {
              case Received:
                     m_nState++;
                     // 将请求转发给订单团队
                     m_order.submitRequest();
                     std::cout << "********** 提交给订单团队，跟踪次数：" <<  m_nCount << " **********" << std::endl;
                     break;
              case SubmittedToOrderTeam:
                     // 如果订单团队完成验证，则向供应商发出请求
                     if (m_order.checkStatus()) {
                           m_nState++;
                           m_vendor.submitRequest();
                           std::cout << "********** 提交给供应商，跟踪次数：" <<  m_nCount << " **********" << std::endl;
                     }
                     break;
              case SubmittedToVendor:
                     // 如果供应商已将包裹打包，将其转发给快递员
                     if (m_vendor.checkStatus()) {
                           m_nState++;
                           m_courier.submitRequest();
                           std::cout << "********** 提交给快递员，跟踪次数：" <<  m_nCount << " **********" << std::endl;
                     }
                     break;
              case SubmittedToCourier:
                     // 如果包裹交付，订单完成
                     if (m_courier.checkStatus())
                           return true;
              default:
                     break;
              }
              m_nCount++;
              // 订单未完成
              return false;
       }
private:
       enum States {
              Received,  // 收到
              SubmittedToOrderTeam,  // 提交给订单团队
              SubmittedToVendor,  // 提交给供应商
              SubmittedToCourier  // 提交给快递员
       };
       int m_nState;  // 订单状态
       int m_nCount;  // 跟踪次数
       OrderTeam m_order;
       Vendor m_vendor;
       Courier m_courier;
};
 
#include "facade.h"
int main()
{
       OnlineShoppingFacade facade;
       // 提交订单
       facade.submitRequest();
       // 跟踪订单，直到订单完成
       while (!facade.checkStatus());
       std::cout << "********** 订单完成，跟踪次数：" << facade.followupNum() << "  **********" << std::endl;
       getchar();
       return 0;
}