Linux C++ 047-设计模式之责任链模式

本节关键字：Linux、C++、设计模式、责任链模式
相关库函数：

简介

责任链模式是面向对象中的一种软件设计模式，它包含了一些命令对象和一些处理对象，每个处理对象决定它能处理那些命令对象，它也知道应该把自己不能处理的命令对象交下一个处理对象，该模式还描述了往该链添加新的处理对象的方法。

代码示例

class Request
{
public:string requestType;string requestContent;int number;
};
class Manager
{
protected:string name;Manager* superior;
public:Manager(string name) {this->name = name;}void setSuperior(Manager* superior) {this->superior = superior;}virtual void requestApplications(Request* request) = 0;
};
class CommonManager : public Manager
{
public:CommonManager(string name) :Manager(name){ }void requestApplications(Request* request) {if (request->requestType == "qingjia" && request->number <= 2) {cout << name << " " << "pizhun" << request->requestContent << "number: " << request->number << endl;}else {if (superior != NULL) {superior->requestApplications(request);}}}
};
class Majordomo : public Manager
{
public:Majordomo(string name) : Manager(name){ }void requestApplications(Request* request) {if (request->requestType == "qingjia" && request->number <= 5) {cout << name << " " << "pizhun" << request->requestContent << "number: " << request->number << endl;}else {if (superior != NULL) {superior->requestApplications(request);}}}
};
class GeneralManager : public Manager
{
public:GeneralManager(string name) : Manager(name){ }void requestApplications(Request* request) {if (request->requestType == "qingjia") {cout << name << " " << "pizhun" << request->requestContent << "number: " << request->number << endl;}}
};
int main_Request()
{CommonManager* jingli = new CommonManager("jingli");Majordomo* zongjian = new Majordomo("zongjian");GeneralManager* zongjingli = new GeneralManager("zongjingli");jingli->setSuperior(zongjian);zongjian->setSuperior(zongjingli);Request* request = new Request();request->requestType = "qingjia";request->requestContent = "LI qingjia";request->number = 1;jingli->requestApplications(request);request->requestType = "qingjia";request->requestContent = "LI qingjia";request->number = 4;jingli->requestApplications(request);request->requestType = "qingjia";request->requestContent = "LI qingjia";request->number = 10;jingli->requestApplications(request);return 0;
}
/* 运行结果：
jingli  pizhun LI qingjia number: 1
zongjian  pizhun LI qingjia number: 4
zongjingli  pizhun LI qingjia number: 10
*/
// 对于抽象基类的派生类：经理类，总监类，总经理类都能够处理请求，只不过根据请求的内容不同，他们自己如果不能处理，需要请求自己的上级处理，那么在这里面需要定义设置自己的上级以及处理请求的成员函数
// 客户端：实例化请求对象，以及经理对象，并初始化请求对象的内容以及经理之间的上下级关系，请求直接交给最底层的经理来处理即可（它内部直到这个请求最终谁有权力处理）
//