ChainOfResponsibility模式

最新推荐文章于 2025-09-08 09:22:18 发布

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最新推荐文章于 2025-09-08 09:22:18 发布

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文章标签： python

原文链接：https://my.oschina.net/u/221120/blog/890254

本文介绍了一个使用C++实现的日志系统设计方案，通过抽象基类AbstractLogger定义了日志记录的基本行为，并展示了如何通过继承来创建不同类型的日志器如控制台日志(ConsoleLogger)、错误日志(ErrorLogger)及文件日志(FileLogger)。

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class AbstractLogger 
{
public:
	enum Level
	{
		INFO,
		DEBUG,
		ERROR 
	};
	AbstractLogger (AbstractLogger *pNextLogger){m_pNextLogger=pNextLogger;}
	virtual~AbstractLogger (){}
	virtual void HandleRequset()=0;
	virtual void SetHander(AbstractLogger *pNextLogger){m_pNextLogger=pNextLogger;}
protected:
	AbstractLogger *m_pNextLogger;
    Level m_level;
};

class ConsoleLogger :public AbstractLogger
{
public:
	ConsoleLogger(AbstractLogger *pNextLogger=nullptr):AbstractLogger(pNextLogger){this->m_level=INFO;}
	~ConsoleLogger(){};
	void HandleRequset(){if(m_pNextLogger){m_pNextLogger->HandleRequset();}else {printf("this is ConsoleLogger HandleRequset\n");}}
};

class ErrorLogger  :public AbstractLogger
{
public:
	ErrorLogger (AbstractLogger *pNextLogger=nullptr):AbstractLogger(pNextLogger){this->m_level=ERROR;}
	~ErrorLogger (){};
	void HandleRequset(){if(m_pNextLogger){m_pNextLogger->HandleRequset();}else {printf("this is ErrorLogger  HandleRequset\n");}}
};

class FileLogger   :public AbstractLogger
{
public:
	FileLogger  (AbstractLogger *pNextLogger=nullptr):AbstractLogger(pNextLogger){this->m_level=DEBUG;}
	~FileLogger  (){};
	void HandleRequset(){if(m_pNextLogger){m_pNextLogger->HandleRequset();}else {printf("this is FileLogger   HandleRequset\n");}}
};
int _tmain(int argc, _TCHAR* argv[])
{
	ConsoleLogger cl;
	ErrorLogger el;
	FileLogger fl;
	cl.HandleRequset();
	cl.SetHander(&el);
	cl.HandleRequset();

	el.HandleRequset();
	el.SetHander(&fl);
	el.HandleRequset();

	fl.HandleRequset();

	getchar();
	return 0;
}

转载于:https://my.oschina.net/u/221120/blog/890254