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| 1 | +//Mediator（中介者模式-对象行为型） |
| 2 | +//用一个中介对象来封装一系列的对象交互。 |
| 3 | +//中介者使各对象不需要显式地相互引用，从而使其耦合松散， |
| 4 | +//而且可以独立地改变它们之间的交互。 |
| 5 | +#include <iostream> |
| 6 | + |
| 7 | +//不知道为什么书上用Colleague（同事）一词来表示协作类 |
| 8 | +class Colleague; |
| 9 | + |
| 10 | +//中介者接口 |
| 11 | +class Mediator |
| 12 | +{ |
| 13 | +public: |
| 14 | + virtual ~Mediator() {} |
| 15 | + virtual void notify(Colleague* sender, int type) = 0; |
| 16 | +}; |
| 17 | + |
| 18 | +//"同事"类接口 |
| 19 | +class Colleague |
| 20 | +{ |
| 21 | +public: |
| 22 | + virtual ~Colleague() {} |
| 23 | + void setMediator(Mediator* ptr) { |
| 24 | + mediator = ptr; |
| 25 | + } |
| 26 | + void notify(int type) { |
| 27 | + std::cout << "Colleague notify:" << type << std::endl; |
| 28 | + if (!mediator) { |
| 29 | + return; |
| 30 | + } |
| 31 | + mediator->notify(this, type); |
| 32 | + } |
| 33 | +private: |
| 34 | + Mediator* mediator{ nullptr }; |
| 35 | +}; |
| 36 | + |
| 37 | +//具体的同事类1 |
| 38 | +class ConcreteColleague1 : public Colleague |
| 39 | +{ |
| 40 | +public: |
| 41 | + void update() { |
| 42 | + std::cout << "ConcreteColleague1 update" << std::endl; |
| 43 | + } |
| 44 | +}; |
| 45 | + |
| 46 | +//具体的同事类2 |
| 47 | +class ConcreteColleague2 : public Colleague |
| 48 | +{ |
| 49 | +public: |
| 50 | + void update() { |
| 51 | + std::cout << "ConcreteColleague2 update" << std::endl; |
| 52 | + } |
| 53 | +}; |
| 54 | + |
| 55 | +//具体的中介者类 |
| 56 | +class ConcreteMediator : public Mediator |
| 57 | +{ |
| 58 | +public: |
| 59 | + ConcreteMediator(ConcreteColleague1* c1, ConcreteColleague2* c2) |
| 60 | + : colleague1(c1), colleague2(c2) { |
| 61 | + c1->setMediator(this); |
| 62 | + c2->setMediator(this); |
| 63 | + } |
| 64 | + ~ConcreteMediator() {} |
| 65 | + //具体的交互逻辑 |
| 66 | + void notify(Colleague* sender, int type) override { |
| 67 | + std::cout << "ConcreteMediator notify:" << type << std::endl; |
| 68 | + if (type == 1 && sender == colleague1) { |
| 69 | + colleague2->update(); |
| 70 | + } |
| 71 | + else { |
| 72 | + colleague1->update(); |
| 73 | + colleague2->update(); |
| 74 | + } |
| 75 | + } |
| 76 | +private: |
| 77 | + ConcreteColleague1* colleague1; |
| 78 | + ConcreteColleague2* colleague2; |
| 79 | +}; |
| 80 | + |
| 81 | +//测试 |
| 82 | +void testMediatorPattern() |
| 83 | +{ |
| 84 | + ConcreteColleague1 c1; |
| 85 | + ConcreteColleague2 c2; |
| 86 | + ConcreteMediator mediator(&c1, &c2); |
| 87 | + //通过中介者去处理关联逻辑 |
| 88 | + std::cout << "c1 notify" << std::endl; |
| 89 | + c1.notify(1); |
| 90 | + std::cout << "c2 notify" << std::endl; |
| 91 | + c2.notify(1); |
| 92 | +} |
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