116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
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/*
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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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/*!
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* \file sink.hpp
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* \author Andrey Semashev
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* \date 22.04.2007
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*
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* The header contains an interface declaration for all sinks. This interface is used by the
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* logging core to feed log records to sinks.
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*/
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#ifndef BOOST_LOG_SINKS_SINK_HPP_INCLUDED_
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#define BOOST_LOG_SINKS_SINK_HPP_INCLUDED_
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#include <string>
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#include <boost/log/detail/config.hpp>
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#include <boost/log/detail/light_function.hpp>
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#include <boost/log/core/record_view.hpp>
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#include <boost/log/attributes/attribute_value_set.hpp>
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#include <boost/log/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace sinks {
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//! A base class for a logging sink frontend
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class BOOST_LOG_NO_VTABLE sink
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{
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public:
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//! An exception handler type
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typedef boost::log::aux::light_function< void () > exception_handler_type;
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private:
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//! The flag indicates that the sink passes log records across thread boundaries
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const bool m_cross_thread;
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public:
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/*!
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* Default constructor
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*/
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explicit sink(bool cross_thread) : m_cross_thread(cross_thread)
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{
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}
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/*!
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* Virtual destructor
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*/
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virtual ~sink() {}
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/*!
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* The method returns \c true if no filter is set or the attribute values pass the filter
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*
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* \param attributes A set of attribute values of a logging record
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*/
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virtual bool will_consume(attribute_value_set const& attributes) = 0;
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/*!
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* The method puts logging record to the sink
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*
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* \param rec Logging record to consume
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*/
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virtual void consume(record_view const& rec) = 0;
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/*!
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* The method attempts to put logging record to the sink. The method may be used by the
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* core in order to determine the most efficient order of sinks to feed records to in
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* case of heavy contention. Sink implementations may implement try/backoff logic in
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* order to improve overall logging throughput.
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*
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* \param rec Logging record to consume
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* \return \c true, if the record was consumed, \c false, if not.
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*/
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virtual bool try_consume(record_view const& rec)
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{
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consume(rec);
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return true;
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}
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/*!
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* The method performs flushing of any internal buffers that may hold log records. The method
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* may take considerable time to complete and may block both the calling thread and threads
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* attempting to put new records into the sink while this call is in progress.
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*/
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virtual void flush() = 0;
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/*!
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* The method indicates that the sink passes log records between different threads. This information is
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* needed by the logging core to detach log records from all thread-specific resources before passing it
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* to the sink.
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*/
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bool is_cross_thread() const BOOST_NOEXCEPT { return m_cross_thread; }
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BOOST_DELETED_FUNCTION(sink(sink const&))
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BOOST_DELETED_FUNCTION(sink& operator= (sink const&))
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};
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} // namespace sinks
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif // BOOST_LOG_SINKS_SINK_HPP_INCLUDED_
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