我正在尝试为我的应用程序做一个日志.我想添加一个属性,所以我知道在哪个类是日志.我已经开始测试,看它是否有效:
#include <boost/log/expressions.hpp>
#include <boost/log/attributes.hpp>
#include <boost/log/common.hpp>
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/sinks/sync_frontend.hpp>
#include <boost/log/sinks/syslog_backend.hpp>
enum severity_levels
{
debug,
info,
warning,
error
};
typedef boost::log::sinks::synchronous_sink< boost::log::sinks::syslog_backend > SinkSysLogBackEnd;
typedef boost::log::sources::severity_logger< severity_levels > BoostLogger;
std::ostream& operator<< (std::ostream& strm, severity_levels level)
{
static const char* strings[] =
{
"debug",
"info",
"warning",
"error"
};
if (static_cast< std::size_t >(level) < sizeof(strings) / sizeof(*strings))
strm << strings[level];
else
strm << static_cast< int >(level);
return strm;
}
BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", severity_levels)
BOOST_LOG_ATTRIBUTE_KEYWORD(executable, "Executable", std::string)
BOOST_LOG_ATTRIBUTE_KEYWORD(className, "Class name", std::string)
void init_syslog()
{
// Create a backend
boost::shared_ptr< SinkSysLogBackEnd > sink(new SinkSysLogBackEnd());
// We'll have to map our custom levels to the syslog levels
boost::log::sinks::syslog::custom_severity_mapping< severity_levels > mapping("Severity");
mapping[info] = boost::log::sinks::syslog::info;
mapping[warning] = boost::log::sinks::syslog::warning;
mapping[error] = boost::log::sinks::syslog::error;
sink->set_formatter(
boost::log::expressions::stream
// line id will be written in hex, 8-digits, zero-filled
<< executable << " <" << severity
<< "> : " << boost::log::expressions::smessage);
sink->locked_backend()->set_severity_mapper(mapping);
// Set the remote address to sent syslog messages to
sink->locked_backend()->set_target_address("localhost");
// Wrap it into the frontend and register in the core.
// The backend requires synchronization in the frontend.
boost::log::core::get()->add_sink(sink);
}
class Cls1
{
BoostLogger m_lg;
public:
Cls1()
{
// set the class name to Cls1
}
void foo()
{
// print log that has "Class Name" attribute set to "Cls1"
}
};
class Cls2
{
BoostLogger m_lg;
public:
Cls2()
{
// set the class name to Cls2
}
void foo()
{
// print log that has "Class Name" attribute set to "Cls2"
}
};
int main(int argc, char** argv)
{
init_syslog();
Cls1 o1;
o1.foo();
Cls2 o2;
o2.foo();
return 0;
}
现在我卡住了......
在我编写的示例下面:
Logger.hpp:
#ifndef LOGGER_HPP
#define LOGGER_HPP
#include <ostream>
#include <fstream>
#include <boost/shared_ptr.hpp>
#include <boost/log/common.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/attributes.hpp>
#include <boost/log/sources/logger.hpp>
#include <boost/log/sinks/async_frontend.hpp>
#include <boost/log/sinks/text_ostream_backend.hpp>
#include <boost/utility/empty_deleter.hpp>
class Logger
{
public:
typedef boost::log::sinks::asynchronous_sink<boost::log::sinks::text_ostream_backend> text_sink;
Logger();
~Logger();
void Initialize();
void Finalize();
void addStream(boost::shared_ptr<std::ostream>& stream);
template< typename T >
Logger& operator<<(const T& value)
{
BOOST_LOG(my_logger::get()) << value;
return *this;
}
typedef Logger& (*LoggerManipulator)(Logger&);
Logger& operator<<(LoggerManipulator manip)
{
return manip(*this);
}
static Logger& endl(Logger& stream)
{
std::cout << std::endl;
return stream;
}
typedef std::basic_ostream<char, std::char_traits<char>> CoutType;
typedef CoutType& (*StandardEndLine)(CoutType&);
Logger& operator<<(StandardEndLine manip)
{
manip(std::cout);
return *this;
}
private:
boost::log::sources::logger_mt m_lg;
boost::shared_ptr<text_sink> m_sink;
};
#endif LOGGER_HPP
Logger.cpp:
#include <boost/date_time/posix_time/posix_time.hpp>
#include "Logger.hpp"
Logger::Logger()
:
m_sink(new text_sink),
m_lg()
{
}
Logger::~Logger()
{
}
void Logger::Initialize()
{
m_sink->locked_backend()->auto_flush(true);
m_sink->set_formatter
(
boost::log::expressions::format("[%1%] - %2%")
% boost::log::expressions::attr< boost::posix_time::ptime >("TimeStamp")
% boost::log::expressions::smessage
);
boost::log::core::get()->add_sink(m_sink);
boost::log::core::get()->add_global_attribute("TimeStamp",boost::log::attributes::local_clock());
}
void Logger::Finalize()
{
}
void Logger::addStream(boost::shared_ptr<std::ostream>& stream)
{
m_sink->locked_backend()->add_stream(stream);
}
main.cpp中:
int main
{
boost::shared_ptr<std::ostream> stream_out(&std::clog, boost::empty_deleter());
boost::shared_ptr<std::ostream> stream_file(new std::ofstream(ProgramName + ".log", std::ostream::app));
Logger logger;
logger.addStream(stream_out);
logger.addStream(stream_file);
logger.Initialize();
logger << "Sample";
return 0;
}
我已经为每个类使用静态记录器并使用初始化它们的方法解决了这个问题。像这样的东西：
BoostLogger setClassNameAttribute(const std::string& classNameIn)
{
BoostLogger lg;
lg.add_attribute("ClassName", boost::log::attributes::constant<std::string>(classNameIn));
return lg;
}
class Cls1
{
static BoostLogger sm_lg;
public:
Cls1()
{
// set the class name to Cls1
}
void foo()
{
// print log that has "Class Name" attribute set to "Cls1"
}
};
BoostLogger Cls1::sm_lg = setClassNameAttribute("Cls1");
class Cls2
{
static BoostLogger sm_lg;
public:
Cls2()
{
// set the class name to Cls2
}
void foo()
{
// print log that has "Class Name" attribute set to "Cls2"
}
};
BoostLogger Cls2::sm_lg = setClassNameAttribute("Cls2");