学步园

中介者模式

　　　GOOD：用一个中介对象来封装一系列的对象交互，中介者使各对象不需要显示的相互引用，从而降低耦合；而且可以独立地改变它们之间的交互。

#include <iostream>
#include <string>
#include <vector>
using namespace std;

class Colleague;
//中介者类
class Mediator
{
public:
	virtual void Send(string message,Colleague* col) = 0;
};
//抽象同事类
class Colleague
{
protected:
	Mediator* mediator;
public:
	Colleague(Mediator* temp)
	{
		mediator = temp;
	}
};
//同事一
class Colleague1 : public Colleague
{
public:
	Colleague1(Mediator* media) : Colleague(media){}

	void Send(string strMessage)
	{
		mediator->Send(strMessage,this);
	}

	void Notify(string strMessage)
	{
		cout<<"同事一获得了消息"<<strMessage<<endl;
	}
};

//同事二
class Colleague2 : public Colleague
{
public:
	Colleague2(Mediator* media) : Colleague(media){}

	void Send(string strMessage)
	{
		mediator->Send(strMessage,this);
	}

	void Notify(string strMessage)
	{
		cout<<"同事二获得了消息"<<strMessage<<endl;
	}
};

//具体中介者类
class ConcreteMediator : public Mediator
{
public:
	Colleague1 * col1;
	Colleague2 * col2;
	virtual void Send(string message,Colleague* col)
	{
		if(col == col1)
			col2->Notify(message);
		else 
			col1->Notify(message);
	}
};

//客户端：
int main()
{
	ConcreteMediator * m = new ConcreteMediator();

	//让同事认识中介
	Colleague1* col1 = new Colleague1(m);
	Colleague2* col2 = new Colleague2(m);

	//让中介认识具体的同事类
	m->col1 = col1;
	m->col2 = col2;

	col1->Send("吃饭了吗？");
	col2->Send("还没吃，你请吗？");
	return 0;
}

//转载请注明，文章来自：http://blog.csdn.net/windows_nt