中介者模式(大话设计模式)C/C++版本

中介者模式

C++

// 中介者模式(Mediator),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得相互引用，从而使得其耦合松散，而且可以独立地改变他们之间得交互#include <iostream>
#include <string>using namespace std;#define SAFE_DELETE(p) \if (p)             \{                  \delete p;      \p = NULL       \}class Mediator;// 抽象同事类
class Colleague
{
public:Colleague(Mediator *pMediator) : m_pMediator(pMediator){}; // 得到中介者对象virtual void Send(char *message) = 0;protected:Mediator *m_pMediator;
};// 具体同事1
class ConcreteColleague1 : public Colleague
{
public:ConcreteColleague1(Mediator *pMediator) : Colleague(pMediator){};virtual void Send(char *message);void Notify(char *message){cout << "同事1得到消息:" << message << endl;}
};
// 具体同事2
class ConcreteColleague2 : public Colleague
{
public:ConcreteColleague2(Mediator *pMediator) : Colleague(pMediator){};virtual void Send(char *message);void Notify(char *message){cout << "同事2得到消息:" << message << endl;}
};// 主管
class Mediator
{
public:virtual void Send(char *message, Colleague *pColleague) = 0;
};void ConcreteColleague1::Send(char *message)
{m_pMediator->Send(message, this);
}void ConcreteColleague2::Send(char *message)
{m_pMediator->Send(message, this);
}
// 具体主管
class ConcreteMediator : public Mediator
{
public:// 重写声明方法 实现了两个对象得通信void Send(char *message, Colleague *pColleague){ConcreteColleague1 *pConcreteColleague1 = dynamic_cast<ConcreteColleague1 *>(pColleague);if (pConcreteColleague1){cout << "消息来自同事1" << endl;if (m_pColleague2){m_pColleague2->Notify(message);}}else{cout << "消息来自同事2" << endl;if (m_pColleague1){m_pColleague1->Notify(message);}}}// 具体主管了解改组下的所有得同事.... 所以拥有同事1和同事2得所有属性void setColleague1(Colleague *pColleague){m_pColleague1 = dynamic_cast<ConcreteColleague1 *>(pColleague);}void setColleague2(Colleague *pColleague){m_pColleague2 = dynamic_cast<ConcreteColleague2 *>(pColleague);}private:ConcreteColleague1 *m_pColleague1; // 同事1ConcreteColleague2 *m_pColleague2; // 同事2
};int main(int argc, char **argv)
{Mediator *pMediator = new ConcreteMediator();Colleague *pColleague1 = new ConcreteColleague1(pMediator);Colleague *pColleague2 = new ConcreteColleague2(pMediator);ConcreteMediator *pConcreteMediator = dynamic_cast<ConcreteMediator *>(pMediator);pConcreteMediator->setColleague1(pColleague1);pConcreteMediator->setColleague2(pColleague2);char message1[128] = "你吃饭了吗?";pColleague1->Send(message1);char message2[128] = "还没呢";pColleague2->Send(message2);delete pColleague1;delete pColleague2;delete pMediator;return 0;
}

C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>typedef struct Mediator Mediator;
typedef struct Colleague Colleague;// 定义抽象同事
typedef struct Colleague
{void (*send)(Colleague *self, char *message);void (*notify)(Colleague *self, char *message);Mediator *mediator;
} Colleague;// 定义中介者
typedef struct Mediator
{void (*send)(Mediator *self, char *message, Colleague *pColleague);Colleague *colleague1;Colleague *colleague2;
} Mediator;// 创建同事
Colleague *create_colleague(void (*send)(Colleague *self, char *message),void (*notify)(Colleague *self, char *message))
{Colleague *colleague = malloc(sizeof(Colleague));colleague->send = send;colleague->notify = notify;colleague->mediator = NULL;return colleague;
}// 创建中介者
Mediator *create_mediator()
{Mediator *mediator = malloc(sizeof(Mediator));mediator->send = NULL;mediator->colleague1 = NULL;mediator->colleague2 = NULL;return mediator;
}// 具体同事1的发送函数
void concrete_colleague1_send(Colleague *self, char *message)
{self->mediator->send(self->mediator, message, self);
}// 具体同事1的通知函数
void concrete_colleague1_notify(Colleague *self, char *message)
{printf("同事1得到消息:%s\n", message);
}// 具体同事2的发送函数
void concrete_colleague2_send(Colleague *self, char *message)
{self->mediator->send(self->mediator, message, self);
}// 具体同事2的通知函数
void concrete_colleague2_notify(Colleague *self, char *message)
{printf("同事2得到消息:%s\n", message);
}// 具体中介者的发送函数
void concrete_mediator_send(Mediator *self, char *message, Colleague *pColleague)
{if (self->colleague1 == pColleague){printf("消息来自同事1\n");if (self->colleague2 != NULL){self->colleague2->notify(self->colleague2, message);}}else{printf("消息来自同事2\n");if (self->colleague1 != NULL){self->colleague1->notify(self->colleague1, message);}}
}int main()
{Mediator *mediator = create_mediator();mediator->send = concrete_mediator_send;Colleague *colleague1 = create_colleague(concrete_colleague1_send, concrete_colleague1_notify);Colleague *colleague2 = create_colleague(concrete_colleague2_send, concrete_colleague2_notify);colleague1->mediator = mediator;colleague2->mediator = mediator;mediator->colleague1 = colleague1;mediator->colleague2 = colleague2;char message1[] = "你吃饭了吗?";colleague1->send(colleague1, message1);char message2[] = "还没呢";colleague2->send(colleague2, message2);free(colleague1);free(colleague2);free(mediator);return 0;
}