设计模式-代理模式

为其他对象提供一种代理以控制对这个对象的访问。在某些情况下。一个对象不适合或者不能直接引用另一个对象。代理在它们中起到中介的作用。

常见代理：代理服务器，缓冲服务器

#include <iostream>
using namespace std;

class AbstractInterface{
public:
    virtual void run()=0;

};


class MySystem:AbstractInterface{
public:
    virtual void run(){
        cout<<"System runing"<<endl;
    }

};

class MySystemProxy:public AbstractInterface{
public:
    MySystemProxy(string username,string passwd){
        this->passWord = passwd;
        this->userName = username;
        pSystem = new MySystem;
    }

    bool checkUserAndPassword(){
        if(userName == "admin" && passWord == "admin"){
            return true;
        }
        return false;
    }

    virtual void run(){
        if(checkUserAndPassword()){
            this->pSystem->run();
        }
        else{
            cout<<"userName or passWord error"<<endl;
        }
    }

    ~MySystemProxy(){
        if(pSystem!=NULL){
            delete pSystem;
        }
    }
public:
    MySystem* pSystem;
    string userName;
    string passWord;
};


int main(int argc, char *argv[])
{
    //通过代理启动服务。
    MySystemProxy* proxy = new MySystemProxy("11","22");
    proxy->run();

    proxy = new MySystemProxy("admin","admin");
    proxy->run();

    return 0;
}