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- /*
- * 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 with bounded log record queue 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::bounded_ordering_queue<
- logging::attribute_value_ordering< unsigned int, std::less< unsigned int > >,
- 128, // queue no more than 128 log records
- sinks::block_on_overflow // wait until records are processed
- >
- > 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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