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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 <fstream>
- #include <iostream>
- #include <functional>
- #include <boost/smart_ptr/shared_ptr.hpp>
- #include <boost/core/null_deleter.hpp>
- #include <boost/date_time/posix_time/posix_time_types.hpp>
- #include <boost/log/core.hpp>
- #include <boost/log/expressions.hpp>
- #include <boost/log/sinks/async_frontend.hpp>
- #include <boost/log/sinks/unbounded_ordering_queue.hpp>
- #include <boost/log/sinks/text_ostream_backend.hpp>
- #include <boost/log/sources/severity_channel_logger.hpp>
- #include <boost/log/sources/record_ostream.hpp>
- #include <boost/log/utility/record_ordering.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 keywords = boost::log::keywords;
- enum severity_level
- {
- normal,
- warning,
- error
- };
- //[ example_sinks_ordering_async_init
- // Complete sink type
- typedef sinks::asynchronous_sink<
- sinks::text_ostream_backend,
- sinks::unbounded_ordering_queue< /*< log record queueing strategy >*/
- logging::attribute_value_ordering< /*< log record ordering predicate type >*/
- unsigned int, /*< attribute value type >*/
- std::less< unsigned int > /*< optional, attribute value comparison predicate; `std::less` equivalent is used by default >*/
- >
- >
- > sink_t;
- boost::shared_ptr< sink_t > init_logging()
- {
- boost::shared_ptr< logging::core > core = logging::core::get();
- // Create a backend and initialize it with a stream
- boost::shared_ptr< sinks::text_ostream_backend > backend =
- boost::make_shared< sinks::text_ostream_backend >();
- backend->add_stream(
- boost::shared_ptr< std::ostream >(&std::clog, boost::null_deleter()));
- // Wrap it into the frontend and register in the core
- boost::shared_ptr< sink_t > sink(new sink_t(
- backend, /*< pointer to the pre-initialized backend >*/
- keywords::order =
- logging::make_attr_ordering("LineID", std::less< unsigned int >()), /*< log record ordering predicate >*/
- keywords::ordering_window = boost::posix_time::seconds(1) /*< latency of log record processing >*/
- ));
- core->add_sink(sink);
- // You can manage filtering and formatting through the sink interface
- sink->set_filter(expr::attr< severity_level >("Severity") >= warning);
- sink->set_formatter
- (
- expr::stream
- << "Level: " << expr::attr< severity_level >("Severity")
- << " Message: " << expr::smessage
- );
- // You can also manage backend in a thread-safe manner
- {
- sink_t::locked_backend_ptr p = sink->locked_backend();
- p->add_stream(boost::make_shared< std::ofstream >("sample.log"));
- } // the backend gets released here
- return sink;
- }
- //]
- //[ example_sinks_ordering_async_stop
- void stop_logging(boost::shared_ptr< sink_t >& sink)
- {
- boost::shared_ptr< logging::core > core = logging::core::get();
- // Remove the sink from the core, so that no records are passed to it
- core->remove_sink(sink);
- // Break the feeding loop
- sink->stop();
- // Flush all log records that may have left buffered
- sink->flush();
- sink.reset();
- }
- //]
- int main(int, char*[])
- {
- boost::shared_ptr< sink_t > sink = init_logging();
- logging::add_common_attributes();
- src::severity_channel_logger< severity_level > lg(keywords::channel = "net");
- BOOST_LOG_SEV(lg, warning) << "Hello world!";
- stop_logging(sink);
- return 0;
- }
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