6_Log4cpp.cc

//g++ log4cpp.cc  -llog4cpp -lpthread  -std=c++11

//单例模式下的log4cpp简单封装
//log4cpp PatternLayout(定义输出格式) FileAppender(定义输出文件形式)  Category(日志种类),add 各种类型appender

#include <log4cpp/Category.hh>
#include <log4cpp/Priority.hh>
#include <log4cpp/PatternLayout.hh>
#include <log4cpp/FileAppender.hh>
#include <log4cpp/RollingFileAppender.hh>
#include <iostream>
#include <sstream>
#include <string>

using std::cout;
using std::endl;
using std::ostringstream;
using std::string;
using namespace log4cpp;
#define RollingFileName "roll_log4cpp.log"

class Mylog4cpp{
public:
	static Mylog4cpp * getInstance(){            //单例模式
		if(_instance==NULL)
			_instance = new Mylog4cpp();
		return _instance;
	}
	~Mylog4cpp();
	void logInfo (const string & Message);	  
	void logError(const string & Message);
	void logWarn (const string & Message);
	void logDebug(const string & Message);
private:
	Category & _root;                   //引用避免了再次复制root对象
private:
	static Mylog4cpp * _instance;
	Mylog4cpp();
};

Mylog4cpp * Mylog4cpp::_instance=NULL;          //静态成员类外初始化

Mylog4cpp::Mylog4cpp()
:_root(Category::getRoot())
{
	PatternLayout * _ptnLyout = new PatternLayout();
	_ptnLyout->setConversionPattern("%d{%Y/%m/%d %H:%M:%S} [%5p] :%m%n");             //PatternLayout定义布局格式 
	RollingFileAppender * _rollingFileAppender = new RollingFileAppender("rollingFileAppender", RollingFileName,5 * 1024,2) ; //设置回卷格式fileappender
	_rollingFileAppender->setLayout(_ptnLyout);
	
	_root.addAppender(_rollingFileAppender);   //可以多次add不同类型的appender 实现向不同流输出
	_root.setPriority(Priority::DEBUG);
}

Mylog4cpp::~Mylog4cpp(){
	//delete _ptnLyout;
	//delete _rollingFileAppender;
	Category::shutdown();
}

void Mylog4cpp::logInfo (const string & Message){
	string Message2=Message;
	Message2 += __FILE__;
	Message2 += ".";
	Message2 += __FUNCTION__;
	Message2 += ".";
	Message2 += std::to_string(__LINE__);
	_root.info(Message2);     
}		
void Mylog4cpp::logError (const string & Message){
	string Message2=Message;
	Message2 += __FILE__;
	Message2 += ".";
	Message2 += __FUNCTION__;
	Message2 += ".";
	Message2 += std::to_string(__LINE__);
	_root.error(Message2);      
}
void Mylog4cpp::logWarn (const string & Message){
	string Message2=Message;
	Message2 += __FILE__;
	Message2 += ".";
	Message2 += __FUNCTION__;
	Message2 += ".";
	Message2 += std::to_string(__LINE__);
	_root.warn(Message2);      
}
void Mylog4cpp::logDebug (const string & Message){
	string Message2=Message;
	Message2 += __FILE__;
	Message2 += ".";
	Message2 += __FUNCTION__;
	Message2 += ".";
	Message2 += std::to_string(__LINE__);	
	_root.debug(Message2);     
}

int main(void)
{
    Mylog4cpp *mylog4cpp1=Mylog4cpp::getInstance();           //单例模式测试
	Mylog4cpp *mylog4cpp2=Mylog4cpp::getInstance();
	Mylog4cpp *mylog4cpp3=Mylog4cpp::getInstance();
	Mylog4cpp *mylog4cpp4=Mylog4cpp::getInstance();
	cout<<"addr1: "<< mylog4cpp1<<endl;
	cout<<"addr1: "<< mylog4cpp2<<endl;
	cout<<"addr1: "<< mylog4cpp3<<endl;
	cout<<"addr1: "<< mylog4cpp4<<endl;
	
	for(size_t idx = 0; idx != 10; ++idx)
	{
		ostringstream oss;
		oss <<"  "<<__FUNCTION__<<".";
		mylog4cpp1->logInfo(oss.str());
		mylog4cpp2->logError(oss.str());
		mylog4cpp3->logWarn(oss.str());
		mylog4cpp4->logDebug(oss.str());
	}
	return 0;
}