中介者模式（Mediator Pattern）是用来降低多个对象和类之间的通信复杂性。这种模式提供了一个中介类，该类通常处理不同类之间的通信，并支持松耦合，使代码易于维护。中介者模式属于行为型模式。
github源码路径：https://github.com/dangwei-90/Design-Mode
// 此文件包含 "main" 函数。程序执行将在此处开始并结束。 // // 参考大话设计模式 - 中介者模式 #include <iostream> #include <vector> #ifndef SAFE_DELETE #define SAFE_DELETE(p) { if(p){delete(p); (p)=NULL;} } #endif using namespace std; class Colleague; // 中介接口 抽象类 class Mediator { public: virtual void Send(string str, Colleague* colleague) = 0; }; // 响应接口 抽象类 class Colleague { public: virtual void Notify() = 0; void SetMediator(Mediator* mediator) { mediator_ = mediator; } protected: Mediator* mediator_ = nullptr; }; // 响应接口A class ConcreteColleagueA : public Colleague{ public: void SetMediatorA(Mediator* mediator) { mediator_ = mediator; } void Send(string str) { mediator_->Send(str, this); } void Notify() { cout << "A get a msg" << endl; } }; // 响应接口B class ConcreteColleagueB : public Colleague { public: void SetMediatorB(Mediator* mediator) { mediator_ = mediator; } void Send(string str) { mediator_->Send(str, this); } void Notify() { cout << "B get a msg" << endl; } }; // 实现中介：A类 send to B类， B类 send to A类 class ConcreteMediator : public Mediator { public: void SetColleagueA(ConcreteColleagueA* colleague) { colleague_a_ = colleague; } void SetColleagueB(ConcreteColleagueB* colleague) { colleague_b_ = colleague; } void Send(string str, Colleague* colleague) { cout << str << endl; if (colleague == colleague_a_) { colleague_b_->Notify(); } else { colleague_a_->Notify(); } } private: ConcreteColleagueA* colleague_a_ = nullptr; ConcreteColleagueB* colleague_b_ = nullptr; }; int main() { ConcreteMediator* mediator = new ConcreteMediator(); ConcreteColleagueA* colleague_a = new ConcreteColleagueA(); ConcreteColleagueB* colleague_b = new ConcreteColleagueB(); colleague_a->SetMediator(mediator); colleague_b->SetMediator(mediator); mediator->SetColleagueA(colleague_a); mediator->SetColleagueB(colleague_b); colleague_a->Send("a , send a msg"); colleague_b->Send("b , send a msg"); SAFE_DELETE(colleague_a); SAFE_DELETE(colleague_b); SAFE_DELETE(mediator); return 0; }
