libs/log/example/rotating_file/main.cpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2014.
   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   main.cpp
   9  * \author Andrey Semashev
  10  * \date   26.04.2008
  11  *
  12  * \brief  An example of logging into a rotating text file.
  13  *         See the library tutorial for expanded comments on this code.
  14  *         It may also be worthwhile reading the Wiki requirements page:
  15  *         http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Boost.Logging
  16  */
  17
  18 // #define BOOST_LOG_DYN_LINK 1
  19
  20 #include <stdexcept>
  21 #include <string>
  22 #include <iostream>
  23 #include <boost/smart_ptr/shared_ptr.hpp>
  24 #include <boost/date_time/posix_time/posix_time.hpp>
  25
  26 #include <boost/log/common.hpp>
  27 #include <boost/log/expressions.hpp>
  28 #include <boost/log/attributes.hpp>
  29 #include <boost/log/sources/logger.hpp>
  30 #include <boost/log/sinks/sync_frontend.hpp>
  31 #include <boost/log/sinks/text_file_backend.hpp>
  32
  33 namespace logging = boost::log;
  34 namespace attrs = boost::log::attributes;
  35 namespace src = boost::log::sources;
  36 namespace sinks = boost::log::sinks;
  37 namespace expr = boost::log::expressions;
  38 namespace keywords = boost::log::keywords;
  39
  40 using boost::shared_ptr;
  41
  42 enum { LOG_RECORDS_TO_WRITE = 10000 };
  43
  44 int main(int argc, char* argv[])
  45 {
  46     try
  47     {
  48         // Create a text file sink
  49         typedef sinks::synchronous_sink< sinks::text_file_backend > file_sink;
  50         shared_ptr< file_sink > sink(new file_sink(
  51             keywords::file_name = "%Y%m%d_%H%M%S_%5N.log",      // file name pattern
  52             keywords::rotation_size = 16384                     // rotation size, in characters
  53             ));
  54
  55         // Set up where the rotated files will be stored
  56         sink->locked_backend()->set_file_collector(sinks::file::make_collector(
  57             keywords::target = "logs",                          // where to store rotated files
  58             keywords::max_size = 16 * 1024 * 1024,              // maximum total size of the stored files, in bytes
  59             keywords::min_free_space = 100 * 1024 * 1024        // minimum free space on the drive, in bytes
  60             ));
  61
  62         // Upon restart, scan the target directory for files matching the file_name pattern
  63         sink->locked_backend()->scan_for_files();
  64
  65         sink->set_formatter
  66         (
  67             expr::format("%1%: [%2%] - %3%")
  68                 % expr::attr< unsigned int >("RecordID")
  69                 % expr::attr< boost::posix_time::ptime >("TimeStamp")
  70                 % expr::smessage
  71         );
  72
  73         // Add it to the core
  74         logging::core::get()->add_sink(sink);
  75
  76         // Add some attributes too
  77         logging::core::get()->add_global_attribute("TimeStamp", attrs::local_clock());
  78         logging::core::get()->add_global_attribute("RecordID", attrs::counter< unsigned int >());
  79
  80         // Do some logging
  81         src::logger lg;
  82         for (unsigned int i = 0; i < LOG_RECORDS_TO_WRITE; ++i)
  83         {
  84             BOOST_LOG(lg) << "Some log record";
  85         }
  86
  87         return 0;
  88     }
  89     catch (std::exception& e)
  90     {
  91         std::cout << "FAILURE: " << e.what() << std::endl;
  92         return 1;
  93     }
  94 }