134 lines
4.2 KiB
C++
134 lines
4.2 KiB
C++
/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file main.cpp
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* \author Andrey Semashev
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* \date 01.12.2012
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*
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* \brief An example of using attribute keywords.
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*/
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// #define BOOST_LOG_USE_CHAR
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// #define BOOST_ALL_DYN_LINK 1
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// #define BOOST_LOG_DYN_LINK 1
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#include <iostream>
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#include <boost/log/common.hpp>
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#include <boost/log/expressions.hpp>
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#include <boost/log/utility/setup/file.hpp>
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#include <boost/log/utility/setup/console.hpp>
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#include <boost/log/utility/setup/common_attributes.hpp>
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#include <boost/log/attributes/timer.hpp>
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#include <boost/log/attributes/named_scope.hpp>
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#include <boost/log/sources/logger.hpp>
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#include <boost/log/support/date_time.hpp>
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namespace logging = boost::log;
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namespace sinks = boost::log::sinks;
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namespace attrs = boost::log::attributes;
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namespace src = boost::log::sources;
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namespace expr = boost::log::expressions;
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namespace keywords = boost::log::keywords;
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using boost::shared_ptr;
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// Here we define our application severity levels.
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enum severity_level
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{
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normal,
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notification,
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warning,
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error,
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critical
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};
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// The formatting logic for the severity level
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template< typename CharT, typename TraitsT >
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inline std::basic_ostream< CharT, TraitsT >& operator<< (
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std::basic_ostream< CharT, TraitsT >& strm, severity_level lvl)
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{
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static const char* const str[] =
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{
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"normal",
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"notification",
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"warning",
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"error",
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"critical"
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};
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if (static_cast< std::size_t >(lvl) < (sizeof(str) / sizeof(*str)))
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strm << str[lvl];
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else
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strm << static_cast< int >(lvl);
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return strm;
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}
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// Declare attribute keywords
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BOOST_LOG_ATTRIBUTE_KEYWORD(_severity, "Severity", severity_level)
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BOOST_LOG_ATTRIBUTE_KEYWORD(_timestamp, "TimeStamp", boost::posix_time::ptime)
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BOOST_LOG_ATTRIBUTE_KEYWORD(_uptime, "Uptime", attrs::timer::value_type)
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BOOST_LOG_ATTRIBUTE_KEYWORD(_scope, "Scope", attrs::named_scope::value_type)
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int main(int argc, char* argv[])
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{
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// This is a simple tutorial/example of Boost.Log usage
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// The first thing we have to do to get using the library is
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// to set up the logging sinks - i.e. where the logs will be written to.
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logging::add_console_log(std::clog, keywords::format = "%TimeStamp%: %_%");
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// One can also use lambda expressions to setup filters and formatters
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logging::add_file_log
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(
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"sample.log",
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keywords::filter = _severity >= warning,
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keywords::format = expr::stream
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<< expr::format_date_time(_timestamp, "%Y-%m-%d, %H:%M:%S.%f")
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<< " [" << expr::format_date_time(_uptime, "%O:%M:%S")
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<< "] [" << expr::format_named_scope(_scope, keywords::format = "%n (%f:%l)")
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<< "] <" << _severity
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<< "> " << expr::message
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/*
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keywords::format = expr::format("%1% [%2%] [%3%] <%4%> %5%")
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% expr::format_date_time(_timestamp, "%Y-%m-%d, %H:%M:%S.%f")
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% expr::format_date_time(_uptime, "%O:%M:%S")
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% expr::format_named_scope(_scope, keywords::format = "%n (%f:%l)")
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% _severity
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% expr::message
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*/
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);
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// Also let's add some commonly used attributes, like timestamp and record counter.
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logging::add_common_attributes();
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logging::core::get()->add_thread_attribute("Scope", attrs::named_scope());
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BOOST_LOG_FUNCTION();
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// Now our logs will be written both to the console and to the file.
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// Let's do a quick test and output something. We have to create a logger for this.
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src::logger lg;
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// And output...
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BOOST_LOG(lg) << "Hello, World!";
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// Now, let's try logging with severity
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src::severity_logger< severity_level > slg;
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// Let's pretend we also want to profile our code, so add a special timer attribute.
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slg.add_attribute("Uptime", attrs::timer());
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BOOST_LOG_SEV(slg, normal) << "A normal severity message, will not pass to the file";
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BOOST_LOG_SEV(slg, warning) << "A warning severity message, will pass to the file";
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BOOST_LOG_SEV(slg, error) << "An error severity message, will pass to the file";
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return 0;
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}
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