c++ 中介者模式（mediator）

中介者模式:用一个中介对象来封装一系列的对象交互。中介者使各个对象不需要显示地相互引用，从而使其耦合松散，而且可以独立地改变他们之间的交互。中介者模式的例子很多，大到联合国安理会，小到房屋中介。下面以房屋中介来介绍中介者模式。

#include <iostream>

#include <string>



using namespace std;



class Mediator;



class Person

{

public:

    virtual void setMediator(Mediator* mediator){};

    virtual void sendMessage(string msg) = 0;

    virtual void getMessage(){};

protected:

    Mediator *m_mediator;

};



class Mediator 

{

public:

    virtual void setHost(Person* p) = 0;

    virtual void setClient(Person* p) = 0;

    virtual void sendMsg(Person* p,string msg)

    {

    

    }



}; 



class HouseMediator:public Mediator

{

public:

    void setHost(Person* p)

    {

        m_host = p;

    }

    void setClient(Person* p)

    {

        m_client = p;

    }

    void sendMsg(Person* p,string msg)

    {

        if(p == m_host)

        {

            m_client->getMessage();

        }

        else

        {

            m_host->getMessage();

        }

    }

private:

    Person* m_host;

    Person* m_client;

};



class HostPerson:public Person

{

public:

    void setMediator(Mediator* mediator)

    {

        m_mediator = mediator;

    }

    void sendMessage(string msg)

    {

        m_mediator->sendMsg(this,msg);

    }

    void getMessage(string msg)

    {

        cout << "房东收到消息！" <<endl;

    }



};



class ClientPerson:public Person

{

public:

    void setMediator(Mediator* mediator)

    {

        m_mediator = mediator;

    }

    void sendMessage(string msg)

    {

        m_mediator->sendMsg(this,msg);

    }

    void getMessage(string msg)

    {

        cout << "客户收到消息！" <<endl;

    }



};

接口使用

#include "mediator.h"



int main()

{

    HouseMediator *mediator = new HouseMediator();

    HostPerson *host = new HostPerson();

    host->setMediator(mediator);

    ClientPerson *client = new ClientPerson();

    client->setMediator(mediator);

    mediator->setClient(client);

    mediator->setHost(host);

    client->sendMessage("我要租房子!");

    host->sendMessage("有房子要出租!");



    return 0;

}

 

博客参照：

http://blog.csdn.net/wuzhekai1985/article/details/6673603