Chris@16: /*
Chris@101:  *          Copyright Andrey Semashev 2007 - 2015.
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  *    (See accompanying file LICENSE_1_0.txt or copy at
Chris@16:  *          http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  */
Chris@16: /*!
Chris@16:  * \file   current_thread_id.hpp
Chris@16:  * \author Andrey Semashev
Chris@16:  * \date   12.09.2009
Chris@16:  *
Chris@16:  * The header contains implementation of a current thread id attribute
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_LOG_ATTRIBUTES_CURRENT_THREAD_ID_HPP_INCLUDED_
Chris@16: #define BOOST_LOG_ATTRIBUTES_CURRENT_THREAD_ID_HPP_INCLUDED_
Chris@16: 
Chris@16: #include <boost/log/detail/config.hpp>
Chris@16: 
Chris@16: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #if defined(BOOST_LOG_NO_THREADS)
Chris@16: #error Boost.Log: The current_thread_id attribute is only available in multithreaded builds
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/smart_ptr/intrusive_ptr.hpp>
Chris@16: #include <boost/log/detail/thread_id.hpp>
Chris@16: #include <boost/log/attributes/attribute.hpp>
Chris@16: #include <boost/log/attributes/attribute_cast.hpp>
Chris@16: #include <boost/log/attributes/attribute_value_impl.hpp>
Chris@16: #include <boost/log/detail/header.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: BOOST_LOG_OPEN_NAMESPACE
Chris@16: 
Chris@16: //! Thread identifier type
Chris@16: typedef boost::log::aux::thread::id thread_id;
Chris@16: 
Chris@16: namespace attributes {
Chris@16: 
Chris@16: /*!
Chris@16:  * \brief A class of an attribute that always returns the current thread identifier
Chris@16:  *
Chris@16:  * \note This attribute can be registered globally, it will still return the correct
Chris@16:  *       thread identifier, no matter which thread emits the log record.
Chris@16:  */
Chris@16: class current_thread_id :
Chris@16:     public attribute
Chris@16: {
Chris@16: public:
Chris@16:     //! A held attribute value type
Chris@16:     typedef thread_id value_type;
Chris@16: 
Chris@16: protected:
Chris@16:     //! Factory implementation
Chris@16:     class BOOST_SYMBOL_VISIBLE impl :
Chris@16:         public attribute_value::impl
Chris@16:     {
Chris@16:     public:
Chris@16:         bool dispatch(type_dispatcher& dispatcher)
Chris@16:         {
Chris@16:             type_dispatcher::callback< value_type > callback =
Chris@16:                 dispatcher.get_callback< value_type >();
Chris@16:             if (callback)
Chris@16:             {
Chris@16:                 callback(boost::log::aux::this_thread::get_id());
Chris@16:                 return true;
Chris@16:             }
Chris@16:             else
Chris@16:                 return false;
Chris@16:         }
Chris@16: 
Chris@16:         intrusive_ptr< attribute_value::impl > detach_from_thread()
Chris@16:         {
Chris@16:             typedef attribute_value_impl< value_type > detached_value;
Chris@16:             return new detached_value(boost::log::aux::this_thread::get_id());
Chris@16:         }
Chris@16: 
Chris@16:         type_info_wrapper get_type() const { return type_info_wrapper(typeid(value_type)); }
Chris@16:     };
Chris@16: 
Chris@16: public:
Chris@16:     /*!
Chris@16:      * Default constructor
Chris@16:      */
Chris@16:     current_thread_id() : attribute(new impl())
Chris@16:     {
Chris@16:     }
Chris@16:     /*!
Chris@16:      * Constructor for casting support
Chris@16:      */
Chris@16:     explicit current_thread_id(cast_source const& source) :
Chris@16:         attribute(source.as< impl >())
Chris@16:     {
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: } // namespace attributes
Chris@16: 
Chris@16: BOOST_LOG_CLOSE_NAMESPACE // namespace log
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/log/detail/footer.hpp>
Chris@16: 
Chris@16: #endif // BOOST_LOG_ATTRIBUTES_CURRENT_THREAD_ID_HPP_INCLUDED_