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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)
*/
/*!
* \file unlocked_frontend.hpp
* \author Andrey Semashev
* \date 14.07.2009
*
* The header contains declaration of an unlocked sink frontend.
*/
#ifndef BOOST_LOG_SINKS_UNLOCKED_FRONTEND_HPP_INCLUDED_
#define BOOST_LOG_SINKS_UNLOCKED_FRONTEND_HPP_INCLUDED_
#include <boost/static_assert.hpp>
#include <boost/smart_ptr/shared_ptr.hpp>
#include <boost/smart_ptr/make_shared_object.hpp>
#include <boost/preprocessor/control/if.hpp>
#include <boost/preprocessor/comparison/equal.hpp>
#include <boost/log/detail/config.hpp>
#include <boost/log/detail/parameter_tools.hpp>
#include <boost/log/detail/fake_mutex.hpp>
#include <boost/log/sinks/basic_sink_frontend.hpp>
#include <boost/log/sinks/frontend_requirements.hpp>
#include <boost/log/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
BOOST_LOG_OPEN_NAMESPACE
namespace sinks {
#ifndef BOOST_LOG_DOXYGEN_PASS
#define BOOST_LOG_SINK_CTOR_FORWARD_INTERNAL_1(n, data)\
template< typename T0 >\
explicit unlocked_sink(T0 const& arg0, typename boost::log::aux::enable_if_named_parameters< T0, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) :\
base_type(false),\
m_pBackend(boost::make_shared< sink_backend_type >(arg0)) {}
#define BOOST_LOG_SINK_CTOR_FORWARD_INTERNAL_N(n, data)\
template< BOOST_PP_ENUM_PARAMS(n, typename T) >\
explicit unlocked_sink(BOOST_PP_ENUM_BINARY_PARAMS(n, T, const& arg)) :\
base_type(false),\
m_pBackend(boost::make_shared< sink_backend_type >(BOOST_PP_ENUM_PARAMS(n, arg))) {}
#define BOOST_LOG_SINK_CTOR_FORWARD_INTERNAL(z, n, data)\
BOOST_PP_IF(BOOST_PP_EQUAL(n, 1), BOOST_LOG_SINK_CTOR_FORWARD_INTERNAL_1, BOOST_LOG_SINK_CTOR_FORWARD_INTERNAL_N)(n, data)
#endif // BOOST_LOG_DOXYGEN_PASS
/*!
* \brief Non-blocking logging sink frontend
*
* The sink frontend does not perform thread synchronization and
* simply passes logging records to the sink backend.
*/
template< typename SinkBackendT >
class unlocked_sink :
public aux::make_sink_frontend_base< SinkBackendT >::type
{
typedef typename aux::make_sink_frontend_base< SinkBackendT >::type base_type;
public:
//! Sink implementation type
typedef SinkBackendT sink_backend_type;
//! \cond
BOOST_STATIC_ASSERT_MSG((has_requirement< typename sink_backend_type::frontend_requirements, concurrent_feeding >::value), "Unlocked sink frontend is incompatible with the specified backend: thread synchronization requirements are not met");
//! \endcond
//! Type of pointer to the backend
typedef shared_ptr< sink_backend_type > locked_backend_ptr;
private:
//! Pointer to the backend
const shared_ptr< sink_backend_type > m_pBackend;
public:
/*!
* Default constructor. Constructs the sink backend instance.
* Requires the backend to be default-constructible.
*/
unlocked_sink() :
base_type(false),
m_pBackend(boost::make_shared< sink_backend_type >())
{
}
/*!
* Constructor attaches user-constructed backend instance
*
* \param backend Pointer to the backend instance
*
* \pre \a backend is not \c NULL.
*/
explicit unlocked_sink(shared_ptr< sink_backend_type > const& backend) :
base_type(false),
m_pBackend(backend)
{
}
/*!
* Constructor that passes arbitrary named parameters to the interprocess sink backend constructor.
* Refer to the backend documentation for the list of supported parameters.
*/
#ifndef BOOST_LOG_DOXYGEN_PASS
BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_GEN(BOOST_LOG_SINK_CTOR_FORWARD_INTERNAL, ~)
#else
template< typename... Args >
explicit unlocked_sink(Args&&... args);
#endif
/*!
* Locking accessor to the attached backend.
*
* \note Does not do any actual locking, provided only for interface consistency
* with other frontends.
*/
locked_backend_ptr locked_backend()
{
return m_pBackend;
}
/*!
* Passes the log record to the backend
*/
void consume(record_view const& rec)
{
boost::log::aux::fake_mutex m;
base_type::feed_record(rec, m, *m_pBackend);
}
/*!
* The method performs flushing of any internal buffers that may hold log records. The method
* may take considerable time to complete and may block both the calling thread and threads
* attempting to put new records into the sink while this call is in progress.
*/
void flush()
{
boost::log::aux::fake_mutex m;
base_type::flush_backend(m, *m_pBackend);
}
};
#undef BOOST_LOG_SINK_CTOR_FORWARD_INTERNAL_1
#undef BOOST_LOG_SINK_CTOR_FORWARD_INTERNAL_N
#undef BOOST_LOG_SINK_CTOR_FORWARD_INTERNAL
} // namespace sinks
BOOST_LOG_CLOSE_NAMESPACE // namespace log
} // namespace boost
#include <boost/log/detail/footer.hpp>
#endif // BOOST_LOG_SINKS_UNLOCKED_FRONTEND_HPP_INCLUDED_
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