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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 <string>
- #include <iostream>
- #include <boost/smart_ptr/shared_ptr.hpp>
- #include <boost/log/core.hpp>
- #include <boost/log/expressions.hpp>
- #include <boost/log/sinks/unlocked_frontend.hpp>
- #include <boost/log/sinks/basic_sink_backend.hpp>
- #include <boost/log/sinks/frontend_requirements.hpp>
- #include <boost/log/sources/severity_channel_logger.hpp>
- #include <boost/log/sources/record_ostream.hpp>
- namespace logging = boost::log;
- namespace src = boost::log::sources;
- namespace expr = boost::log::expressions;
- namespace sinks = boost::log::sinks;
- namespace keywords = boost::log::keywords;
- //[ example_sinks_unlocked
- enum severity_level
- {
- normal,
- warning,
- error
- };
- // A trivial sink backend that requires no thread synchronization
- class my_backend :
- public sinks::basic_sink_backend< sinks::concurrent_feeding >
- {
- public:
- // The function is called for every log record to be written to log
- void consume(logging::record_view const& rec)
- {
- // We skip the actual synchronization code for brevity
- std::cout << rec[expr::smessage] << std::endl;
- }
- };
- // Complete sink type
- typedef sinks::unlocked_sink< my_backend > sink_t;
- void init_logging()
- {
- boost::shared_ptr< logging::core > core = logging::core::get();
- // The simplest way, the backend is default-constructed
- boost::shared_ptr< sink_t > sink1(new sink_t());
- core->add_sink(sink1);
- // One can construct backend separately and pass it to the frontend
- boost::shared_ptr< my_backend > backend(new my_backend());
- boost::shared_ptr< sink_t > sink2(new sink_t(backend));
- core->add_sink(sink2);
- // You can manage filtering through the sink interface
- sink1->set_filter(expr::attr< severity_level >("Severity") >= warning);
- sink2->set_filter(expr::attr< std::string >("Channel") == "net");
- }
- //]
- int main(int, char*[])
- {
- init_logging();
- src::severity_channel_logger< severity_level > lg(keywords::channel = "net");
- BOOST_LOG_SEV(lg, normal) << "Hello world!";
- return 0;
- }
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