设计模式之中介者模式(Mediator)

中间者模者模式原理：中介者维持所有要交互对象的指针或者对象，所有对象维持一个中介者的指针或者对象。

#include <iostream>
#include <string>

using namespace std;

class Mediator;
class Person
{
public:
	virtual GetMessage(string message)
	{

	}
	virtual void SendMessage(string message)
	{

	}
	virtual void SetMediator(Mediator *pmdiator)
	{

	}
protected:
	Mediator *m_pmediator;
};

class Mediator
{
public:
	void Send(string message,Person *person)
	{
		if (person == m_renter)
		{
			m_landlord->GetMessage(message);
		}
		else
		{
			m_renter->GetMessage(message);
		}
	}
	void SetRenter(Person *prenter)
	{
		m_renter = prenter;
	}
	void SetLandlord(Person *plandlord)
	{
		m_landlord = plandlord;
	}
private:
	Person *m_renter;
	Person *m_landlord;
};

class Renter:public Person
{
public:
	virtual GetMessage(string message)
	{
		cout << "租客收到租房信息："<<message<<endl;
	}
	virtual void SendMessage(string message)
	{
		m_pmediator->Send(message,this);
	}
	virtual void SetMediator(Mediator *pmediator)
	{
		m_pmediator = pmediator;
	}
};
class Landlord:public Person
{
public:
	virtual GetMessage(string message)
	{
		cout << "房东收到租房信息："<<message<<endl;
	}
	virtual void SendMessage(string message)
	{
		m_pmediator->Send(message,this);
	}
	virtual void SetMediator(Mediator *pmediator)
	{
		m_pmediator = pmediator;
	}
};

int main()
{
	Mediator *pmediator = new Mediator();
	Person *prenter = new Renter();
	Person *plandlord = new Landlord();

	pmediator->SetLandlord(plandlord);
	pmediator->SetRenter(prenter);
	prenter->SetMediator(pmediator);
	plandlord->SetMediator(pmediator);

	prenter->SendMessage("我要租一个有网的房子");
	plandlord->SendMessage("我现在有一个两室一厅的房子要出租");
	return 0;
}