108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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#include <string>
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#include <fstream>
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#include <iostream>
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#include <boost/smart_ptr/shared_ptr.hpp>
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#include <boost/core/null_deleter.hpp>
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#include <boost/log/core.hpp>
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#include <boost/log/expressions.hpp>
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#include <boost/log/sinks/async_frontend.hpp>
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#include <boost/log/sinks/text_ostream_backend.hpp>
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#include <boost/log/sinks/bounded_fifo_queue.hpp>
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#include <boost/log/sinks/drop_on_overflow.hpp>
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#include <boost/log/sources/severity_channel_logger.hpp>
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#include <boost/log/sources/record_ostream.hpp>
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namespace logging = boost::log;
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namespace src = boost::log::sources;
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namespace expr = boost::log::expressions;
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namespace sinks = boost::log::sinks;
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namespace keywords = boost::log::keywords;
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enum severity_level
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{
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normal,
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warning,
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error
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};
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//[ example_sinks_bounded_async_init
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// Complete sink type
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typedef sinks::asynchronous_sink<
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sinks::text_ostream_backend,
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sinks::bounded_fifo_queue< /*< log record queueing strategy >*/
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100, /*< record queue capacity >*/
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sinks::drop_on_overflow /*< overflow handling policy >*/
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>
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> sink_t;
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boost::shared_ptr< sink_t > init_logging()
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{
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boost::shared_ptr< logging::core > core = logging::core::get();
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// Create a backend and initialize it with a stream
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boost::shared_ptr< sinks::text_ostream_backend > backend =
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boost::make_shared< sinks::text_ostream_backend >();
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backend->add_stream(
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boost::shared_ptr< std::ostream >(&std::clog, boost::null_deleter()));
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// Wrap it into the frontend and register in the core
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boost::shared_ptr< sink_t > sink(new sink_t(backend));
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core->add_sink(sink);
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// ...
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//<-
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// You can manage filtering and formatting through the sink interface
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sink->set_filter(expr::attr< severity_level >("Severity") >= warning);
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sink->set_formatter
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(
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expr::stream
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<< "Level: " << expr::attr< severity_level >("Severity")
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<< " Message: " << expr::message
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);
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// You can also manage backend in a thread-safe manner
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{
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sink_t::locked_backend_ptr p = sink->locked_backend();
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p->add_stream(boost::make_shared< std::ofstream >("sample.log"));
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}
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//->
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return sink;
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}
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//]
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void stop_logging(boost::shared_ptr< sink_t >& sink)
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{
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boost::shared_ptr< logging::core > core = logging::core::get();
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// Remove the sink from the core, so that no records are passed to it
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core->remove_sink(sink);
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// Break the feeding loop
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sink->stop();
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// Flush all log records that may have left buffered
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sink->flush();
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sink.reset();
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}
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int main(int, char*[])
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{
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boost::shared_ptr< sink_t > sink = init_logging();
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src::severity_channel_logger< severity_level > lg(keywords::channel = "net");
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BOOST_LOG_SEV(lg, warning) << "Hello world!";
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stop_logging(sink);
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return 0;
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}
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