Facade Pattern

1.Facade 模式在高层组合封装了子系统的接口，解耦了系统。隐藏了子系统的复杂性，使其更易使用。

2.Facade 模式结构图

3.实现

 1 #ifndef _FACADE_H_
 2 #define _FACADE_H_ 
 3 
 4 class Subsystem1
 5 {
 6 public:
 7     Subsystem1();
 8     ~Subsystem1();
 9     void Operation();
10 protected: 
11 private:
12 };
13 
14 class Subsystem2
15 {
16 public:
17     Subsystem2();
18     ~Subsystem2();
19     void Operation(); 
20 protected: 
21 private:
22 };
23 
24 class Facade
25 {
26 public:
27     Facade();
28     ~Facade();
29     void OperationWrapper(); 
30 protected:
31 private:
32     Subsystem1* _subs1;
33     Subsystem2* _subs2;
34 };
35 
36 #endif

Facade.h

 1 #include "Facade.h" 
 2 #include <iostream>
 3 using namespace std; 
 4 
 5 Subsystem1::Subsystem1()
 6 {
 7 
 8 } 
 9 
10 Subsystem1::~Subsystem1()
11 {
12 
13 } 
14 
15 void Subsystem1::Operation()
16 {
17     cout<<"Subsystem1 operation.."<<endl;
18 }
19 
20 Subsystem2::Subsystem2()
21 {
22 
23 } 
24 
25 Subsystem2::~Subsystem2()
26 {
27 
28 } 
29 
30 void Subsystem2::Operation()
31 {
32     cout<<"Subsystem2 operation.."<<endl;
33 } 
34 
35 Facade::Facade()
36 {
37     this->_subs1 = new Subsystem1();
38     this->_subs2 = new Subsystem2();
39 }
40 
41 Facade::~Facade()
42 {
43     delete _subs1;
44     delete _subs2;
45 }
46 
47 void Facade::OperationWrapper()
48 {
49     this->_subs1->Operation();
50     this->_subs2->Operation();
51 }

Facade.cpp

 1 #include "Facade.h" 
 2 #include <iostream>
 3 using namespace std; 
 4 
 5 int main(int argc,char* argv[])
 6 {
 7     Facade* f = new Facade();
 8     f->OperationWrapper(); 
 9     return 0;
10 }

main.cpp