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// boost1.67-1.67.0/libs/log/example/async_log/main.cpp
/*
* Copyright Andrey Semashev 2007 - 2015.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
/*!
* \file main.cpp
* \author Andrey Semashev
* \date 30.08.2009
*
* \brief An example of asynchronous logging in multiple threads.
*/
#define BOOST_LOG_DYN_LINK 1
#include <stdexcept>
#include <string>
#include <iostream>
#include <fstream>
#include <functional>
#include <boost/ref.hpp>
#include <boost/bind.hpp>
#include <boost/smart_ptr/shared_ptr.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/thread/thread.hpp>
#include <boost/thread/barrier.hpp>
#include <boost/log/common.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/attributes.hpp>
#include <boost/log/sinks.hpp>
#include <boost/log/sources/logger.hpp>
#include <boost/log/utility/record_ordering.hpp>
namespace logging = boost::log;
namespace attrs = boost::log::attributes;
namespace src = boost::log::sources;
namespace sinks = boost::log::sinks;
namespace expr = boost::log::expressions;
namespace keywords = boost::log::keywords;
using boost::shared_ptr;
enum
{
LOG_RECORDS_TO_WRITE = 10000,
THREAD_COUNT = 2
};
BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(test_lg, src::logger_mt)
//! This function is executed in multiple threads
void thread_fun(boost::barrier& bar)
{
// Wait until all threads are created
bar.wait();
// Here we go. First, identify the thread.
BOOST_LOG_SCOPED_THREAD_TAG("ThreadID", boost::this_thread::get_id());
// Now, do some logging
for (unsigned int i = 0; i < LOG_RECORDS_TO_WRITE; ++i)
{
BOOST_LOG(test_lg::get()) << "Log record " << i;
}
}
int main(int argc, char* argv[])
{
try
{
// Open a rotating text file
shared_ptr< std::ostream > strm(new std::ofstream("test.log"));
if (!strm->good())
throw std::runtime_error("Failed to open a text log file");
// Create a text file sink
typedef sinks::text_ostream_backend backend_t;
typedef sinks::asynchronous_sink<
backend_t,
sinks::unbounded_ordering_queue<
logging::attribute_value_ordering< unsigned int, std::less< unsigned int > >
>
> sink_t;
shared_ptr< sink_t > sink(new sink_t(
boost::make_shared< backend_t >(),
// We'll apply record ordering to ensure that records from different threads go sequentially in the file
keywords::order = logging::make_attr_ordering("RecordID", std::less< unsigned int >())));
sink->locked_backend()->add_stream(strm);
sink->set_formatter
(
expr::format("%1%: [%2%] [%3%] - %4%")
% expr::attr< unsigned int >("RecordID")
% expr::attr< boost::posix_time::ptime >("TimeStamp")
% expr::attr< boost::thread::id >("ThreadID")
% expr::smessage
);
// Add it to the core
logging::core::get()->add_sink(sink);
// Add some attributes too
logging::core::get()->add_global_attribute("TimeStamp", attrs::local_clock());
logging::core::get()->add_global_attribute("RecordID", attrs::counter< unsigned int >());
// Create logging threads
boost::barrier bar(THREAD_COUNT);
boost::thread_group threads;
for (unsigned int i = 0; i < THREAD_COUNT; ++i)
threads.create_thread(boost::bind(&thread_fun, boost::ref(bar)));
// Wait until all action ends
threads.join_all();
// Flush all buffered records
sink->stop();
sink->flush();
return 0;
}
catch (std::exception& e)
{
std::cout << "FAILURE: " << e.what() << std::endl;
return 1;
}
}
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