Command 命令模式
GOOD：一、建立命令队列；二、可以将命令记入日志；三、接收请求的一方可以拒绝；四、添加一个新命令类不影响其它类；
命令模式把请求一个操作的对象与知道怎么操行一个操作的对象分开
例：
#include <iostream>
#include <string>
#include <vector>
using namespace std;
//烤肉师傅
class Barbucer
{
public:
void MakeMutton()
{
cout<<"烤羊肉"<<endl;
}
void MakeChickenWing()
{
cout<<"烤鸡翅膀"<<endl;
}
};
//抽象命令类
class Command
{
protected:
Barbucer* receiver;
public:
Command(Barbucer* temp)
{
receiver = temp;
}
virtual void ExecuteCmd()=0;
};
//烤羊肉命令
class BakeMuttonCmd : public Command
{
public:
BakeMuttonCmd(Barbucer* temp) : Command(temp){}
virtual void ExecuteCmd()
{
receiver->MakeMutton();
}
};
//烤鸡翅
class ChickenWingCmd : public Command
{
public:
ChickenWingCmd(Barbucer* temp) : Command(temp){}
virtual void ExecuteCmd()
{
receiver->MakeChickenWing();
}
};
//服务员类
class Waiter
{
protected:
vector<Command*> m_commandList;
public:
void SetCmd(Command* temp)
{
m_commandList.push_back(temp);
cout<<"增加定单"<<endl;
}
//通知执行
void Notify()
{
vector<Command*>::iterator p=m_commandList.begin();
while(p!=m_commandList.end())
{
(*p)->ExecuteCmd();
p++;
}
}
};
//客户端
int main()
{
//店里添加烤肉师傅、菜单、服务员等顾客
Barbucer* barbucer=new Barbucer();
Command* cmd= new BakeMuttonCmd(barbucer);
Command* cmd2=new ChickenWingCmd(barbucer);
Waiter* girl = new Waiter();
//点菜
girl->SetCmd(cmd);
girl->SetCmd(cmd2);
//服务员通知
girl->Notify();
return 0;
}