scbc_repos/TCLTools/TCLTools/log.h

#ifndef   _MACRO_LogModule
#define   _MACRO_LogModule

#include <stdio.h>
#include "log_macro.h"
#include "CritSection.h"

/* 每个线程的buffer size*/
#define   _LOG_BUFFSIZE  1024*1024*4
/* 当前进程的 Stream IO buffer size*/
#define   _SYS_BUFFSIZE  1024*1024*8
/* log 文件字符串路径最大长度*/
#define	  _LOG_PATH_LEN  250
/* 日志对应的模块名*/
#define   _LOG_MODULE_LEN 32

typedef  enum LogLevel {  
    LL_DEBUG = 1,
    LL_TRACE = 2,
    LL_NOTICE = 3, 
    LL_WARNING = 4, 
    LL_ERROR = 5,
}LogLevel;


class Log_Writer
{
public:
    Log_Writer()
    {
        m_system_level = LL_NOTICE;
        fp = NULL;
        m_issync = false;
        m_isappend = true;
        m_filelocation[0] ='\0'; 
    }
    ~Log_Writer(){
        logclose();
    }
    bool loginit(LogLevel l, const  char *filelocation, bool append = true, bool issync = true);
    bool log(LogLevel l,char *logformat,...);
    LogLevel get_level();
    bool logclose();
private:
    const char* logLevelToString(LogLevel l);
    bool checklevel(LogLevel l);
    int premakestr(char* m_buffer, LogLevel l);
    bool _write(char *_pbuffer, int len);
private:
    enum LogLevel m_system_level;
    FILE* fp;
    bool m_issync;
    bool m_isappend;
    char m_filelocation[MAX_PATH];
    ThreadSection m_mutex;
    static char m_buffer[_LOG_BUFFSIZE];
    //The __thread specifier may be applied to any global, file-scoped static, function-scoped static, 
    //or static data member of a class. It may not be applied to block-scoped automatic or non-static data member
    //in the log  scence,It's safe!!!!
    //一言以蔽之，此场景不用担心__thread带来资源leak,同时也不用担心多个Log_Writer会干扰，
    //因为一个线程同一时间只有一个Log_Writer在干活，干完之后m_buffer就reset了
    //所以即便一个线程用户多个Log_Write串行(因为一个线程内的运行态只有串行) 也是线程安全的！！！
};

extern Log_Writer WARN_W;
extern Log_Writer INFO_W;

/**
* LogLevel 日志级别
* p_modulename 模块名 如mysql
* p_logdir  日志输出目录
* */
bool log_init(LogLevel l, const char* p_modulename, const char* p_logdir);
#endif