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  • Mediator Pattern

    1.Mediator Pattern

    • Mediator模式将对象间的交互和通讯封装在一个类中，各个对象间的通信不必显示去声明和引用，将多对多的通信转化为一对多的通信，大大降低了系统的复杂性能。
    • 通过Mediator，各个Colleage就不必维护各自通信的对象和通信协议，降低了系统的耦合性。
    • Mediator模式还有一个很显著额特点就是将控制集中，集中的优点就是便于管理，也正符合了OO设计中的每个类的职责要单一和集中的原则

    2.Mediator模式结构图

    3.实现

     1 #ifndef _COLLEAGE_H_ 
 2 #define _COLLEAGE_H_
 3 
 4 #include <string> 
 5 using namespace std;
 6 class Mediator;
 7 
 8 class Colleage 
 9 { 
10 public:
11     virtual ~Colleage();
12     virtual void Aciton() = 0;
13     virtual void SetState(const string& sdt) = 0;
14     virtual string GetState() = 0; 
15 protected:
16     Colleage();
17     Colleage(Mediator* mdt);
18     Mediator* _mdt;
19 private:
20 };
21 
22 class ConcreteColleageA:public Colleage 
23 { 
24 public:
25     ConcreteColleageA();
26     ConcreteColleageA(Mediator* mdt);
27     ~ConcreteColleageA();
28     void Aciton();
29     void SetState(const string& sdt);
30     string GetState();
31 protected:
32 private: 
33     string _sdt;
34 };
35 
36 class ConcreteColleageB:public Colleage 
37 { 
38 public: 
39     ConcreteColleageB();
40     ConcreteColleageB(Mediator* mdt);
41     ~ConcreteColleageB();
42     void Aciton();
43     void SetState(const string& sdt);
44     string GetState();
45 protected:
46 private: 
47     string _sdt;
48 };
49 
50 #endif
    Colleage.h
     1 #include "Mediator.h"
 2 #include "Colleage.h"
 3 #include <iostream> 
 4 using namespace std;
 5 
 6 Colleage::Colleage() 
 7 { 
 8     //_sdt = " "; 
 9 }
10 Colleage::Colleage(Mediator* mdt) 
11 { 
12     this->_mdt = mdt;
13     //_sdt = " "; 
14 }
15 Colleage::~Colleage() 
16 {
17     
18 }
19 ConcreteColleageA::ConcreteColleageA()
20 {
21 
22 }
23 ConcreteColleageA::~ConcreteColleageA() 
24 {
25 
26 }
27 ConcreteColleageA::ConcreteColleageA(Mediator* mdt):Colleage(mdt) 
28 {
29 
30 }
31 string ConcreteColleageA::GetState() 
32 { 
33     return _sdt;
34 }
35 void ConcreteColleageA::SetState(const string& sdt) 
36 { 
37     _sdt = sdt;
38 }
39 void ConcreteColleageA::Aciton() 
40 { 
41     _mdt->DoActionFromAtoB();
42     cout<<"State of ConcreteColleageB:"<<" "<<this->GetState()<<endl; 
43 }
44 ConcreteColleageB::ConcreteColleageB()
45 {
46 
47 }
48 ConcreteColleageB::~ConcreteColleageB() 
49 {
50 
51 }
52 ConcreteColleageB::ConcreteColleageB(Mediator* mdt):Colleage(mdt)
53 {
54 
55 }
56 void ConcreteColleageB::Aciton() 
57 { 
58     _mdt->DoActionFromBtoA();
59     cout<<"State of ConcreteColleageB:"<<" "<<this->GetState()<<endl; 
60 }
61 string ConcreteColleageB::GetState() 
62 { 
63     return _sdt; 
64 }
65 void ConcreteColleageB::SetState(const string& sdt) 
66 { 
67     _sdt = sdt; 
68 }
    Colleage.cpp
     1 #ifndef _MEDIATOR_H_ 
 2 #define _MEDIATOR_H_
 3 
 4 class Colleage;
 5 
 6 class Mediator 
 7 { 
 8 public: 
 9     virtual ~Mediator();
10     virtual void DoActionFromAtoB() = 0;
11     virtual void DoActionFromBtoA() = 0;
12 protected: 
13     Mediator();
14 private:
15 };
16 
17 class ConcreteMediator:public Mediator
18 { 
19 public:
20     ConcreteMediator();
21     ConcreteMediator(Colleage* clgA,Colleage* clgB);
22     ~ConcreteMediator();
23     void SetConcreteColleageA(Colleage* clgA);
24     void SetConcreteColleageB(Colleage* clgB);
25     Colleage* GetConcreteColleageA();
26     Colleage* GetConcreteColleageB();
27     void IntroColleage(Colleage* clgA,Colleage* clgB);
28     void DoActionFromAtoB();
29     void DoActionFromBtoA();
30 
31 protected:
32 private: 
33     Colleage* _clgA;
34     Colleage* _clgB;
35 };
36 
37 #endif
    Mediator.h
     1 #include "Mediator.h"
 2 #include "Colleage.h"
 3 
 4 Mediator::Mediator() 
 5 {
 6 
 7 }
 8 Mediator::~Mediator()
 9 {
10 
11 }
12 ConcreteMediator::ConcreteMediator()
13 {
14 
15 }
16 ConcreteMediator::~ConcreteMediator() 
17 {
18 
19 }
20 ConcreteMediator::ConcreteMediator(Colleage* clgA,Colleage* clgB) 
21 { 
22     this->_clgA = clgA;
23     this->_clgB = clgB;
24 }
25 void ConcreteMediator::DoActionFromAtoB() 
26 { 
27     _clgB->SetState(_clgA->GetState());
28 }
29 void ConcreteMediator::SetConcreteColleageA(Colleage* clgA) 
30 { 
31     this->_clgA = clgA; 
32 }
33 void ConcreteMediator::SetConcreteColleageB(Colleage* clgB) 
34 { 
35     this->_clgB = clgB;
36 }
37 Colleage* ConcreteMediator::GetConcreteColleageA()
38 {
39     return _clgA; 
40 }
41 Colleage* ConcreteMediator::GetConcreteColleageB()
42 { 
43     return _clgB;
44 }
45 void ConcreteMediator::IntroColleage(Colleage* clgA,Colleage* clgB) 
46 { 
47     this->_clgA = clgA;
48     this->_clgB = clgB; 
49 }
50 void ConcreteMediator::DoActionFromBtoA() 
51 { 
52     _clgA->SetState(_clgB->GetState()); 
53 }
    Mediator.cpp
     1 #include "Mediator.h"
 2 #include "Colleage.h"
 3 
 4 #include <iostream> 
 5 using namespace std;
 6 
 7 int main(int argc,char* argv[]) 
 8 { 
 9     ConcreteMediator* m = new ConcreteMediator();
10 
11     ConcreteColleageA* c1 = new ConcreteColleageA(m); 
12     ConcreteColleageB* c2 = new ConcreteColleageB(m);
13 
14     m->IntroColleage(c1,c2);
15 
16     c1->SetState("old"); 
17     c2->SetState("old"); 
18     c1->Aciton(); 
19     c2->Aciton();
20     cout<<endl;
21 
22     c1->SetState("new"); 
23     c1->Aciton(); 
24     c2->Aciton(); 
25     cout<<endl;
26 
27     c2->SetState("old"); 
28     c2->Aciton(); 
29     c1->Aciton();
30 
31     return 0;
32 }
    main.cpp
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  • 原文地址：https://www.cnblogs.com/programmer-wfq/p/4670708.html
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