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设计模式12——中介者模式
中介者模式中,个体与个体之间不需要发生直接关联,而是只需要与中介者进行交互,并由中介完成一系列任务。
Mediator.h内容
1 #ifndef Mediator_H_H 2 #define Mediator_H_H 3 4 #include <iostream> 5 using namespace std; 6 7 class Student; 8 9 class Mediator10 {11 public:12 Mediator() : src(NULL), target(NULL) {}13 void send(string strMessage);14 void setTarget(Student *target0) { target = target0; }15 16 private:17 Student *src, *target;18 };19 20 class Student21 {22 public:23 Student() : mediator(NULL) {}24 virtual void recvMessage(string strMessage) = 0;25 virtual ~Student() {}26 void sendMessage(Student *student, string strMessage){27 mediator->setTarget(student);28 mediator->send(strMessage);29 }30 void setMediator(Mediator *mediator0) { mediator = mediator0; }31 32 protected:33 Mediator *mediator;34 35 };36 37 class Student1 : public Student38 {39 public:40 virtual void recvMessage(string strMessage){41 cout << "Student1 recv: " << strMessage << endl;42 }43 };44 45 class Student2 : public Student46 {47 public:48 virtual void recvMessage(string strMessage){49 cout << "Student2 recv: " << strMessage << endl;50 }51 52 };53 54 55 void Mediator::send(string strMessage)56 {57 target->recvMessage(strMessage);58 }59 60 61 void MediatorTest()62 {63 Student *student1 = new Student1();64 Student *student2 = new Student2();65 Mediator *mediator = new Mediator();66 student1->setMediator(mediator);67 student2->setMediator(mediator);68 69 student1->sendMessage(student2, "How are you?");70 student2->sendMessage(student1, "Very well, Thank you!");71 72 delete mediator;73 74 delete student1;75 delete student2;76 77 }78 79 80 #endif
运行结果:
创建两个student,他们通过中介者实现了交互过程。
设计模式12——中介者模式
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