ceph/src/boost/boost/log/sinks/text_multifile_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_multifile_backend.hpp
   9  * \author Andrey Semashev
  10  * \date   09.06.2009
  11  *
  12  * The header contains implementation of a text multi-file sink backend.
  13  */
  14
  15 #ifndef BOOST_LOG_SINKS_TEXT_MULTIFILE_BACKEND_HPP_INCLUDED_
  16 #define BOOST_LOG_SINKS_TEXT_MULTIFILE_BACKEND_HPP_INCLUDED_
  17
  18 #include <ios>
  19 #include <string>
  20 #include <locale>
  21 #include <ostream>
  22 #include <boost/mpl/if.hpp>
  23 #include <boost/mpl/bool.hpp>
  24 #include <boost/type_traits/is_same.hpp>
  25 #include <boost/filesystem/path.hpp>
  26 #include <boost/log/detail/config.hpp>
  27 #include <boost/log/detail/light_function.hpp>
  28 #include <boost/log/detail/parameter_tools.hpp>
  29 #include <boost/log/detail/cleanup_scope_guard.hpp>
  30 #include <boost/log/keywords/auto_newline_mode.hpp>
  31 #include <boost/log/sinks/auto_newline_mode.hpp>
  32 #include <boost/log/sinks/basic_sink_backend.hpp>
  33 #include <boost/log/utility/formatting_ostream.hpp>
  34 #include <boost/log/detail/header.hpp>
  35
  36 #ifdef BOOST_HAS_PRAGMA_ONCE
  37 #pragma once
  38 #endif
  39
  40 namespace boost {
  41
  42 BOOST_LOG_OPEN_NAMESPACE
  43
  44 namespace sinks {
  45
  46 namespace file {
  47
  48     /*!
  49      * An adapter class that allows to use regular formatters as file name generators.
  50      */
  51     template< typename FormatterT >
  52     class file_name_composer_adapter
  53     {
  54     public:
  55         //! Functor result type
  56         typedef filesystem::path result_type;
  57         //! File name character type
  58         typedef result_type::string_type::value_type native_char_type;
  59         //! The adopted formatter type
  60         typedef FormatterT formatter_type;
  61         //! Formatting stream type
  62         typedef basic_formatting_ostream< native_char_type > stream_type;
  63
  64     private:
  65         //! The adopted formatter
  66         formatter_type m_Formatter;
  67         //! Formatted file name storage
  68         mutable result_type::string_type m_FileName;
  69         //! Formatting stream
  70         mutable stream_type m_FormattingStream;
  71
  72     public:
  73         /*!
  74          * Initializing constructor
  75          */
  76         explicit file_name_composer_adapter(formatter_type const& formatter, std::locale const& loc = std::locale()) :
  77             m_Formatter(formatter),
  78             m_FormattingStream(m_FileName)
  79         {
  80             m_FormattingStream.exceptions(std::ios_base::badbit | std::ios_base::failbit);
  81             m_FormattingStream.imbue(loc);
  82         }
  83         /*!
  84          * Copy constructor
  85          */
  86         file_name_composer_adapter(file_name_composer_adapter const& that) :
  87             m_Formatter(that.m_Formatter),
  88             m_FormattingStream(m_FileName)
  89         {
  90             m_FormattingStream.exceptions(std::ios_base::badbit | std::ios_base::failbit);
  91             m_FormattingStream.imbue(that.m_FormattingStream.getloc());
  92         }
  93         /*!
  94          * Assignment
  95          */
  96         file_name_composer_adapter& operator= (file_name_composer_adapter const& that)
  97         {
  98             m_Formatter = that.m_Formatter;
  99             return *this;
 100         }
 101
 102         /*!
 103          * The operator generates a file name based on the log record
 104          */
 105         result_type operator() (record_view const& rec) const
 106         {
 107             boost::log::aux::cleanup_guard< stream_type > cleanup1(m_FormattingStream);
 108             boost::log::aux::cleanup_guard< result_type::string_type > cleanup2(m_FileName);
 109
 110             m_Formatter(rec, m_FormattingStream);
 111             m_FormattingStream.flush();
 112
 113             return result_type(m_FileName);
 114         }
 115     };
 116
 117     /*!
 118      * The function adopts a log record formatter into a file name generator
 119      *
 120      * \param fmt The formatter function object to adopt
 121      * \param loc The locale to use to character code conversion and formatting
 122      */
 123     template< typename FormatterT >
 124     inline file_name_composer_adapter< FormatterT > as_file_name_composer(
 125         FormatterT const& fmt, std::locale const& loc = std::locale())
 126     {
 127         return file_name_composer_adapter< FormatterT >(fmt, loc);
 128     }
 129
 130 } // namespace file
 131
 132
 133 /*!
 134  * \brief An implementation of a text multiple files logging sink backend
 135  *
 136  * The sink backend puts formatted log records to one of the text files.
 137  * The particular file is chosen upon each record's attribute values, which allows
 138  * to distribute records into individual files or to group records related to
 139  * some entity or process in a separate file.
 140  */
 141 class text_multifile_backend :
 142     public basic_formatted_sink_backend< char >
 143 {
 144     //! Base type
 145     typedef basic_formatted_sink_backend< char > base_type;
 146
 147 public:
 148     //! Character type
 149     typedef base_type::char_type char_type;
 150     //! String type to be used as a message text holder
 151     typedef base_type::string_type string_type;
 152
 153     //! File name composer functor type
 154     typedef boost::log::aux::light_function< filesystem::path (record_view const&) > file_name_composer_type;
 155
 156 private:
 157     //! \cond
 158
 159     struct implementation;
 160     implementation* m_pImpl;
 161
 162     //! \endcond
 163
 164 public:
 165     /*!
 166      * Default constructor. The constructed sink backend has no file name composer and
 167      * thus will not write any files. All other parameters are set to their defaults.
 168      */
 169     BOOST_LOG_API text_multifile_backend();
 170
 171     /*!
 172      * Constructor. Creates a sink backend with the specified named parameters.
 173      * The following named parameters are supported:
 174      *
 175      * \li \c auto_newline_mode - Specifies automatic trailing newline insertion mode. Must be a value of
 176      *                            the \c auto_newline_mode enum. By default, is <tt>auto_newline_mode::insert_if_missing</tt>.
 177      */
 178 #ifndef BOOST_LOG_DOXYGEN_PASS
 179     BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_CALL(text_multifile_backend, construct)
 180 #else
 181     template< typename... ArgsT >
 182     explicit text_multifile_backend(ArgsT... const& args);
 183 #endif
 184
 185     /*!
 186      * Destructor
 187      */
 188     BOOST_LOG_API ~text_multifile_backend();
 189
 190     /*!
 191      * The method sets file name composer functional object. Log record formatters are accepted, too.
 192      *
 193      * \param composer File name composer functor
 194      */
 195     template< typename ComposerT >
 196     void set_file_name_composer(ComposerT const& composer)
 197     {
 198         set_file_name_composer_internal(composer);
 199     }
 200
 201     /*!
 202      * Selects whether a trailing newline should be automatically inserted after every log record. See
 203      * \c auto_newline_mode description for the possible modes of operation.
 204      *
 205      * \param mode The trailing newline insertion mode.
 206      */
 207     BOOST_LOG_API void set_auto_newline_mode(auto_newline_mode mode);
 208
 209     /*!
 210      * The method writes the message to the sink
 211      */
 212     BOOST_LOG_API void consume(record_view const& rec, string_type const& formatted_message);
 213
 214 private:
 215 #ifndef BOOST_LOG_DOXYGEN_PASS
 216     //! Constructor implementation
 217     template< typename ArgsT >
 218     void construct(ArgsT const& args)
 219     {
 220         construct(args[keywords::auto_newline_mode | insert_if_missing]);
 221     }
 222     //! Constructor implementation
 223     BOOST_LOG_API void construct(auto_newline_mode auto_newline);
 224
 225     //! The method sets the file name composer
 226     BOOST_LOG_API void set_file_name_composer_internal(file_name_composer_type const& composer);
 227 #endif // BOOST_LOG_DOXYGEN_PASS
 228 };
 229
 230 } // namespace sinks
 231
 232 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 233
 234 } // namespace boost
 235
 236 #include <boost/log/detail/footer.hpp>
 237
 238 #endif // BOOST_LOG_SINKS_TEXT_MULTIFILE_BACKEND_HPP_INCLUDED_