ceph/src/boost/boost/log/sinks/text_ostream_backend.hpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   text_ostream_backend.hpp
   9  * \author Andrey Semashev
  10  * \date   22.04.2007
  11  *
  12  * The header contains implementation of a text output stream sink backend.
  13  */
  14
  15 #ifndef BOOST_LOG_SINKS_TEXT_OSTREAM_BACKEND_HPP_INCLUDED_
  16 #define BOOST_LOG_SINKS_TEXT_OSTREAM_BACKEND_HPP_INCLUDED_
  17
  18 #include <ostream>
  19 #include <boost/smart_ptr/shared_ptr.hpp>
  20 #include <boost/log/detail/config.hpp>
  21 #include <boost/log/detail/parameter_tools.hpp>
  22 #include <boost/log/keywords/auto_flush.hpp>
  23 #include <boost/log/keywords/auto_newline_mode.hpp>
  24 #include <boost/log/sinks/auto_newline_mode.hpp>
  25 #include <boost/log/sinks/basic_sink_backend.hpp>
  26 #include <boost/log/sinks/frontend_requirements.hpp>
  27 #include <boost/log/detail/header.hpp>
  28
  29 #ifdef BOOST_HAS_PRAGMA_ONCE
  30 #pragma once
  31 #endif
  32
  33 namespace boost {
  34
  35 BOOST_LOG_OPEN_NAMESPACE
  36
  37 namespace sinks {
  38
  39 /*!
  40  * \brief An implementation of a text output stream logging sink backend
  41  *
  42  * The sink backend puts formatted log records to one or more text streams.
  43  */
  44 template< typename CharT >
  45 class basic_text_ostream_backend :
  46     public basic_formatted_sink_backend<
  47         CharT,
  48         combine_requirements< synchronized_feeding, flushing >::type
  49     >
  50 {
  51     //! Base type
  52     typedef basic_formatted_sink_backend<
  53         CharT,
  54         combine_requirements< synchronized_feeding, flushing >::type
  55     > base_type;
  56
  57 public:
  58     //! Character type
  59     typedef typename base_type::char_type char_type;
  60     //! String type to be used as a message text holder
  61     typedef typename base_type::string_type string_type;
  62     //! Output stream type
  63     typedef std::basic_ostream< char_type > stream_type;
  64
  65 private:
  66     //! \cond
  67
  68     struct implementation;
  69     implementation* m_pImpl;
  70
  71     //! \endcond
  72
  73 public:
  74     /*!
  75      * Constructor. No streams attached to the constructed backend, auto flush feature disabled.
  76      */
  77     BOOST_LOG_API basic_text_ostream_backend();
  78
  79     /*!
  80      * Constructor. Creates a sink backend with the specified named parameters.
  81      * The following named parameters are supported:
  82      *
  83      * \li \c auto_flush - Specifies a flag, whether or not to automatically flush the attached streams after each
  84      *                     written log record. By default, is \c false.
  85      * \li \c auto_newline_mode - Specifies automatic trailing newline insertion mode. Must be a value of
  86      *                            the \c auto_newline_mode enum. By default, is <tt>auto_newline_mode::insert_if_missing</tt>.
  87      */
  88 #ifndef BOOST_LOG_DOXYGEN_PASS
  89     BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_CALL(basic_text_ostream_backend, construct)
  90 #else
  91     template< typename... ArgsT >
  92     explicit basic_text_ostream_backend(ArgsT... const& args);
  93 #endif
  94
  95     /*!
  96      * Destructor
  97      */
  98     BOOST_LOG_API ~basic_text_ostream_backend();
  99
 100     /*!
 101      * The method adds a new stream to the sink.
 102      *
 103      * \param strm Pointer to the stream. Must not be NULL.
 104      */
 105     BOOST_LOG_API void add_stream(shared_ptr< stream_type > const& strm);
 106     /*!
 107      * The method removes a stream from the sink. If the stream is not attached to the sink,
 108      * the method has no effect.
 109      *
 110      * \param strm Pointer to the stream. Must not be NULL.
 111      */
 112     BOOST_LOG_API void remove_stream(shared_ptr< stream_type > const& strm);
 113
 114     /*!
 115      * Sets the flag to automatically flush buffers of all attached streams after each log record.
 116      *
 117      * \param enable The flag indicates whether the automatic buffer flush should be performed.
 118      */
 119     BOOST_LOG_API void auto_flush(bool enable = true);
 120
 121     /*!
 122      * Selects whether a trailing newline should be automatically inserted after every log record. See
 123      * \c auto_newline_mode description for the possible modes of operation.
 124      *
 125      * \param mode The trailing newline insertion mode.
 126      */
 127     BOOST_LOG_API void set_auto_newline_mode(auto_newline_mode mode);
 128
 129     /*!
 130      * The method writes the message to the sink.
 131      */
 132     BOOST_LOG_API void consume(record_view const& rec, string_type const& formatted_message);
 133
 134     /*!
 135      * The method flushes all attached streams.
 136      */
 137     BOOST_LOG_API void flush();
 138
 139 private:
 140 #ifndef BOOST_LOG_DOXYGEN_PASS
 141     //! Constructor implementation
 142     template< typename ArgsT >
 143     void construct(ArgsT const& args)
 144     {
 145         construct(
 146             args[keywords::auto_newline_mode | insert_if_missing],
 147             args[keywords::auto_flush | false]);
 148     }
 149     //! Constructor implementation
 150     BOOST_LOG_API void construct(auto_newline_mode auto_newline, bool auto_flush);
 151 #endif // BOOST_LOG_DOXYGEN_PASS
 152 };
 153
 154 #ifdef BOOST_LOG_USE_CHAR
 155 typedef basic_text_ostream_backend< char > text_ostream_backend;        //!< Convenience typedef for narrow-character logging
 156 #endif
 157 #ifdef BOOST_LOG_USE_WCHAR_T
 158 typedef basic_text_ostream_backend< wchar_t > wtext_ostream_backend;    //!< Convenience typedef for wide-character logging
 159 #endif
 160
 161 } // namespace sinks
 162
 163 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 164
 165 } // namespace boost
 166
 167 #include <boost/log/detail/footer.hpp>
 168
 169 #endif // BOOST_LOG_SINKS_TEXT_OSTREAM_BACKEND_HPP_INCLUDED_