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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)
- */
- #include <cstddef>
- #include <string>
- #include <ostream>
- #include <fstream>
- #include <iomanip>
- #include <boost/smart_ptr/shared_ptr.hpp>
- #include <boost/smart_ptr/make_shared_object.hpp>
- #include <boost/phoenix/bind.hpp>
- #include <boost/date_time/posix_time/posix_time.hpp>
- #include <boost/log/core.hpp>
- #include <boost/log/expressions.hpp>
- #include <boost/log/attributes.hpp>
- #include <boost/log/sources/basic_logger.hpp>
- #include <boost/log/sources/severity_logger.hpp>
- #include <boost/log/sources/severity_channel_logger.hpp>
- #include <boost/log/sources/record_ostream.hpp>
- #include <boost/log/sinks/sync_frontend.hpp>
- #include <boost/log/sinks/text_ostream_backend.hpp>
- #include <boost/log/attributes/scoped_attribute.hpp>
- #include <boost/log/utility/value_ref.hpp>
- #include <boost/log/utility/setup/common_attributes.hpp>
- namespace logging = boost::log;
- namespace src = boost::log::sources;
- namespace expr = boost::log::expressions;
- namespace sinks = boost::log::sinks;
- namespace attrs = boost::log::attributes;
- namespace keywords = boost::log::keywords;
- // We define our own severity levels
- enum severity_level
- {
- normal,
- notification,
- warning,
- error,
- critical
- };
- // The operator puts a human-friendly representation of the severity level to the stream
- std::ostream& operator<< (std::ostream& strm, severity_level level)
- {
- static const char* strings[] =
- {
- "normal",
- "notification",
- "warning",
- "error",
- "critical"
- };
- if (static_cast< std::size_t >(level) < sizeof(strings) / sizeof(*strings))
- strm << strings[level];
- else
- strm << static_cast< int >(level);
- return strm;
- }
- //[ example_tutorial_filtering
- BOOST_LOG_ATTRIBUTE_KEYWORD(line_id, "LineID", unsigned int)
- BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", severity_level)
- BOOST_LOG_ATTRIBUTE_KEYWORD(tag_attr, "Tag", std::string)
- void init()
- {
- // Setup the common formatter for all sinks
- logging::formatter fmt = expr::stream
- << std::setw(6) << std::setfill('0') << line_id << std::setfill(' ')
- << ": <" << severity << ">\t"
- << expr::if_(expr::has_attr(tag_attr))
- [
- expr::stream << "[" << tag_attr << "] "
- ]
- << expr::smessage;
- // Initialize sinks
- typedef sinks::synchronous_sink< sinks::text_ostream_backend > text_sink;
- boost::shared_ptr< text_sink > sink = boost::make_shared< text_sink >();
- sink->locked_backend()->add_stream(
- boost::make_shared< std::ofstream >("full.log"));
- sink->set_formatter(fmt);
- logging::core::get()->add_sink(sink);
- sink = boost::make_shared< text_sink >();
- sink->locked_backend()->add_stream(
- boost::make_shared< std::ofstream >("important.log"));
- sink->set_formatter(fmt);
- sink->set_filter(severity >= warning || (expr::has_attr(tag_attr) && tag_attr == "IMPORTANT_MESSAGE"));
- logging::core::get()->add_sink(sink);
- // Add attributes
- logging::add_common_attributes();
- }
- //]
- #if 0
- //[ example_tutorial_filtering_bind
- bool my_filter(logging::value_ref< severity_level, tag::severity > const& level,
- logging::value_ref< std::string, tag::tag_attr > const& tag)
- {
- return level >= warning || tag == "IMPORTANT_MESSAGE";
- }
- void init()
- {
- //<-
- // Setup the common formatter for all sinks
- logging::formatter fmt = expr::stream
- << std::setw(6) << std::setfill('0') << line_id << std::setfill(' ')
- << ": <" << severity << ">\t"
- << expr::if_(expr::has_attr(tag_attr))
- [
- expr::stream << "[" << tag_attr << "] "
- ]
- << expr::smessage;
- // Initialize sinks
- typedef sinks::synchronous_sink< sinks::text_ostream_backend > text_sink;
- boost::shared_ptr< text_sink > sink = boost::make_shared< text_sink >();
- sink->locked_backend()->add_stream(
- boost::make_shared< std::ofstream >("full.log"));
- sink->set_formatter(fmt);
- logging::core::get()->add_sink(sink);
- sink = boost::make_shared< text_sink >();
- sink->locked_backend()->add_stream(
- boost::make_shared< std::ofstream >("important.log"));
- sink->set_formatter(fmt);
- //->
- // ...
- namespace phoenix = boost::phoenix;
- sink->set_filter(phoenix::bind(&my_filter, severity.or_none(), tag_attr.or_none()));
- // ...
- //<-
- logging::core::get()->add_sink(sink);
- // Add attributes
- logging::add_common_attributes();
- //->
- }
- //]
- #endif
- void logging_function()
- {
- src::severity_logger< severity_level > slg;
- BOOST_LOG_SEV(slg, normal) << "A regular message";
- BOOST_LOG_SEV(slg, warning) << "Something bad is going on but I can handle it";
- BOOST_LOG_SEV(slg, critical) << "Everything crumbles, shoot me now!";
- {
- BOOST_LOG_SCOPED_THREAD_TAG("Tag", "IMPORTANT_MESSAGE");
- BOOST_LOG_SEV(slg, normal) << "An important message";
- }
- }
- int main(int, char*[])
- {
- init();
- logging_function();
- return 0;
- }
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